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Residents of multi-storey buildings will not be able to clear the blockage in the sewer system on their own - they need to contact the emergency service.

The problem of blockage can be solved by installing shut-off valves for the sewer system - the so-called non-return valve.

It is designed to block the reverse flow of wastewater to prevent it from flowing back into the apartment through the sewer system.

Installation of a sewer check valve is recommended primarily in apartments on the first and second floors.

Wastewater usually does not rise above the second or third floors.

The installation location of the check valve is determined by necessity. You can install the valve:

1. To a common sewer pipe. In this case, the valve must be of high capacity.
2. For every plumbing fixture in the apartment.
3. For sewerage with reverse slope.

The reverse slope can only be eliminated by completely reworking the sewerage system, so it is easier and cheaper to install a non-return valve.

As you understand, it is impossible to install a common valve in an apartment building - this can only be done in a small house, but in each apartment, for any drainage system and on each plumbing fixture, it is quite possible to install a shut-off valve for the sewerage system. There are currently two types of check valves for sewerage sold:

These valves are fundamentally different from each other in their design. For example, in a check valve intended for installation in a pressure sewer, inlet and outlet pipes are installed.

Inside the valve chamber there is a ball of air that presses on the membrane if reverse current water. The membrane covers the chamber and water does not enter the pipe. For long-term operation, the valve must be cleaned periodically. For this purpose, the valve is provided with a special cap.

Also, a shut-off valve is immediately installed on the valve, shutting off the sewage system in case of need or emergency. Such a valve is installed at the junction of two pipes, so as not to completely dismantle the sewer system.

The valve can be installed both on vertically located pipes and in a horizontal plane.

The material from which check valves are made is plastic, steel, cast iron, brass. Not long ago, only iron flanged valves were installed in the sewer system.

They are still sold now, but there is little demand for them, since there are more reliable and cheaper PVC valves that are ideal for PVC sewerage.

Check valves for sewerage come in different sizes:

• valve 32 mm
• sewer valve 40 mm
• 110mm check valve
• check valve for sewerage 50 mm

The most common type of check valve is a ball valve. It prevents wastewater from flowing in the opposite direction. The design of such a valve is simple, it looks like this: the shutter device here is a metal ball, which is pressed by a spring when back pressure appears.

Where to install the ball valve depends on its design. For example, a coupling check valve is standardly installed on a vertical pipeline, and a flange check valve is installed on both vertical and horizontal sewer pipelines.

A coupling valve is installed if the check valve is installed on small diameter pipes (up to 2.5 inches). For pipe diameters of 40-600 mm, a flanged check valve is installed.

A ball valve with a moving ball shuts off return flows 100%. It also has 100% straight cross-country ability. It is impossible to jam such a system. A standard check valve is manufactured in a durable housing, with a solid cast iron cover, and the ball itself is coated with nitrile, EPDM, etc.

Another positive quality of the ball valve is excellent maintainability.

If the ball needs to be cleaned or replaced, the sewer ball valve can be easily and quickly disassembled - all you need to do is remove 2 or 4 bolts on the valve cover.

PVC check valve

The check valve is very useful for owners of apartments on the lower floors. It can be installed on both internal and external sewers. These shut-off valves serve to block the reverse flow of sewer water and effectively prevent the entry of various insects and rodents through the sewer system.

If an emergency occurs and a backflow occurs, the valve will automatically shut off the entire sewer system. In such a valve, reverse flow can be blocked forcibly. To do this, simply turn the valve knob to the OFF position.

The PVC sewer check valve has a built-in shut-off element that moves back and forth and perpendicular to the movement of wastewater in the sewer system. The PVC lift check valve can be spring or springless.

Almost all check valves are designed so that they can be installed on both vertical and horizontal pipelines.

In this case, the direction of wastewater flow must be taken into account - usually the direction is indicated by an arrow on the valve body.

The PVC check valve does not react to ultraviolet radiation, does not corrode, and does not react with aggressive chemical impurities. The duration of its operation corresponds to this indicator for plastic pipes.

If you properly operate a PVC check valve, it is quite capable of serving for 50 years or more.

For pressure sewerage

A check valve, which is installed in a pressure sewer system, does not allow a change in the direction of flow of wastewater in the sewer system. These protective pipe fittings allow waste to flow in only one direction and stop fluid flowing in the opposite direction.

The check valve for pressure sewerage operates automatically and is called direct-acting fittings. It's uninterrupted universal device, since the check valve can operate both in normal mode and in an emergency situation.

For example, if several pumps are operating and their pressure lines are combined into one common line, then one check valve (or several) is installed on each individual line, which protects each line from the pressure of the operating pump on any of them.

Thus, if the pressure drops on one line, the pressure on the other lines will remain the same, and an accident will not occur.

If wastewater does not pass through the shut-off valve, then the check valve works like this: under the influence of its weight, the spool in the valve allows the movement of water through the valve seat. In order for wastewater to change direction, it must be stopped.

When the fluid flow stops, the pressure on the other side presses the spool, preventing the formation of a reverse flow of wastewater.

Situations are different, and if there is a sewer blockage, then feel free to contact the SK-City company. It will help you remove the blockage, and if you need to re-lay the pipes.

How to install

Installing a check valve in the sewer system is best done when assembling the pipeline and at the junction of plastic pipes.

You will have to cut into the existing sewer system, that is, disassemble the pipes at the place where the valve is installed.

The check valve must be the same diameter as the pipes, otherwise an adapter will need to be installed.

How to install the valve yourself?

1. Each valve has an arrow showing the direction of movement of wastewater - towards the sewer collector. If you put it the other way around, the valve will not work, although the water will drain.
2. Before installing the valve, check it for leaks. This can only be done visually until the valve is installed in the system.
3. If the tightness of the operating valve becomes less, it will make noise and vibrate during operation. To fix the damage, you need to remove the cover, remove the shutter and replace it. Or, without changing the valve, install a new sealed gasket.

Check valve prices vary greatly. But don’t rush to buy the cheapest one - if the valve does not work, then you will have to spend a lot more repairing your apartment and the apartments of your neighbors below.

Installing a valve will solve many problems. So, if you have mesh filters on your sinks, this will not prevent neighbors’ wastewater from entering your sewer.

No one is immune from accidents in. Therefore, each owner prefers to protect himself from such a misfortune in his own way. For these purposes, special devices have been invented. Of course, creating a check valve with your own hands for a drainage system is very difficult, so you can purchase ready-made factory versions.

The device is designed to prevent wastewater from flowing back into plumbing fixtures. This phenomenon occurs due to stagnation in the pipes and the entry of debris and other particles. Typically, such situations are simply associated with aging communications. Carefully study all the photos in the article.

Basically, installations that prevent flooding of a house from the sewer are often purchased taking into account the material from which the structure is made. This can be a PVC pipeline, metal and other options. Let's look at several popular types that are successfully used at home:

Plumbers take note! When routing sewer pipes from appliances, the speed of movement of the wastewater must be observed. This can be achieved by maintaining the required pipeline slope. If this is not done, the wastewater will move slowly, and the structures, in turn, will become clogged.

How to protect yourself from a flood? Check valve installation method

There are two ways to ensure your home is safe from sewage flooding: firstly, you can install several 50mm diameter locking devices on all drainage sources; secondly, you can limit yourself to one large 110 mm valve and install it in the main pipe coming from the toilet.

It is important to note that if you are installing a valve in the private sector, then the second method will be ideal, but for apartment buildings, it is better to use the first option. Often, locking structures have a PVC operating mechanism. Despite this, the device is quite durable, but requires regular cleaning. Next, let's talk about the process of installing it in the main sewer pipeline. The photo shows the main stages of the repair.

Note! Installing a check valve on a sewer system must be functional. In addition to protection against flooding, the device must perform the functions of preventing unpleasant odors from entering the house and somewhat isolating noise from drains.

Need for an air valve

Instead of the usual outboard device for sewerage systems with a diameter of 100 units, a reverse one can also be used. But keep in mind that this type of device can function only in places where the air temperature is always positive. Look at the photo to see what this equipment looks like.

The installation depends on whether there is a drain in the floor. If available, the structure is placed 35 cm higher from the floor covering. If such a device is not available, the air mechanism is placed higher depending on the highest drainage of plumbing fixtures. Such a part is installed mainly in a free section of the pipeline or in a specially installed adapter near the toilet.

At times we are faced with a situation where the contents of sewer pipes flow in the opposite direction. The main reason for this phenomenon is a blockage in the sewer. In a private house this can happen when the well overflows. You can avoid such trouble. We need to install a check valve on the sewer. This simple but effective device completely blocks the backflow of drains.

Why and who needs it?

The purpose of a sewer check valve is to block the flow of liquid in the opposite direction. In this regard, the main area of ​​application emerges - apartments on the lower floors in high-rise buildings, especially in old buildings.

In multi-storey buildings, owners of apartments on the first floors very often have problems with toilets, from which the contents of the sewer flow out. The blockage usually occurs somewhere in the “beds” - horizontal pipes in the basement. Then all the contents rise through the pipe to the first branch and pour out through the first accessible point - the toilet, spilling onto the floor, sometimes even bathtubs and washbasins are filled.
To solve this problem, you need to install a check valve on the sewer. It will cut off the reverse flow going into your apartment. True, a problem will arise for those who live on the floor above - fecal water can even rise up there. Then they will also have to install a sewer return valve. The drain column usually does not rise above this level - it pushes through the plug and everything goes away.

However, residents of high floors should not rejoice - they too may suffer. Sometimes blockages occur somewhere between floors. This happens mainly due to violations of the sewerage operating rules - someone flushes objects that should not be there, they get stuck, and a traffic jam forms. In this case, toilets on any floor may overflow, depending on where the blockage occurred. So, on any floor except the last one, it makes sense to install a check valve - “just in case.”

The third group of consumers are owners of private houses. In principle, the sewer system of a private house should be designed in such a way that the reverse flow of wastewater is impossible. Even if this is the case, many prefer to play it safe than to later remove foul-smelling “treasures” from the house. A non-return valve for a sewer in a private house also performs another function - it prevents sewer pipe penetration by rodents and other living creatures.

Ventilation in the bathroom and toilet is described here.

Types of check valves and their operating principle

The main purpose of a check valve is to block flow in the opposite direction. To do this, a movable barrier is installed in these mechanical devices. The basic principle of operation is that in a quiet state, the mechanical damper is lowered down, blocking the lumen of the sewer pipe and preventing reverse flow from passing through. When drains appear, it rises (moves to the side), the drains go away, and it closes again. This equipment differs by the type of this barrier and the principle of its operation.

Rotary (petal)

This type of sewer valve has a spring-loaded round membrane (plate). If the flow moves in the “right” direction, it turns, rising upward does not interfere with the drainage. If the movement begins in the other direction, the membrane (plate) is pressed against the rim inside the valve, tightly and hermetically blocking the lumen of the pipe. Some models have a manual shutter. This is the second membrane, which can be controlled using a button mounted on the body.

Due to the shape of the membrane, such shut-off valves are also called petal valves, and sometimes you can hear the term “flaps” - this is because of the way they work - the membrane slams shut if there is no drain.

The device itself is larger than the pipe on which it is installed. So in the pipeline there is first an expansion and then a narrowing of the lumen, and these are potential places for blockages to form. To make it possible to quickly remove blockages, a removable cover is made in the upper part of the check valve body. By removing it, the problem can be quickly resolved.

Lifting check valve for sewerage

This type of shut-off device for a sewer pipe is so named because when the sewage flows in the “correct” direction, the shut-off element rises up. The drains put pressure on the plate blocking the passage, compressing the spring and it rises. There are no drains - the spring unclenches, the passage is locked. When wastewater enters from the “wrong” side, there is no way to open the passage. This is achieved by the nonlinear shape of the body.

A lift check valve is more reliable, but is designed to clog frequently and requires periodic cleaning. Why do you need to remove the cover (unscrew the four bolts), clean or replace the mechanism.

Ball check valve

Another option for a locking device in a check valve is a ball. In these devices, the internal structure of the case plays an important role. Its upper part is designed so that when the drains pass, the ball rolls into a special recess in the body, opening the passage.

When the pipe is dry, it blocks the cross-section; when the flow passes in the opposite direction, it blocks the lumen of the pipe. The main disadvantage of this design is the leakage of drains during flooding - the ball and the side wall of the housing do not always fit perfectly, which leads to the fact that some of the drains still leak out. But there will definitely not be mass flooding and a geyser from the toilet.

Why you need an air valve in the sewer system and how to install it, read here.

Wafer

Many people like this type of check valves more because of their miniature size. This is a very small cylinder with a rotary valve installed inside. It may consist of two parts, which are attached to the central rod, or it may look like a small plate, in one place attached to the wall of the housing using a spring.

Despite its compactness, it is better not to install this type of check valve on a sewer: this is plumbing equipment and it will not work well on a sewer. The second disadvantage is the impossibility of quick cleaning - the design is such that you can only get to the valve by disassembling the connection.

What are they made of and what sizes do they come in?

The most common sewer check valves are made of plastic (PVC) and cast iron. If your sewer pipes are plastic, it makes sense to install the same valve, choosing it according to size. The situation is exactly the same with cast iron. The point is not that the materials are not suitable, but the need for additional adapters, which make the design even more cumbersome.

According to the installation method, the shut-off valve for the sewer can be horizontal or vertical. Select the type depending on the installation location. It must be installed with the same diameter as the pipe; narrowing is not allowed. Accordingly, there are valves for each size. The parameters of some are shown in the table.

When and where to put

As already mentioned, a sewer check valve is a rather cumbersome device. In apartments, bathrooms are usually small, it’s difficult to find a place, but you have to - if you don’t want to have a geyser instead of a toilet.

The exact dimensions of sewer valves depend on the diameter of the pipe on which the device is installed. For example, for a 100-diameter sewer pipe, the minimum length is 40 cm, height and width are slightly less. Such a box must be installed in front of the entrance to the riser.

In this case, you often have to break the floor, already laid tiles - you need to align the holes in the body with the pipes, center everything, and monitor the required angle of inclination. This prospect is especially pleasing if renovations have recently been made. In this case, there is also an option - to embed a check valve into the riser above your entrance. But such work involves interference with the general building system (installation of plumbing fixtures on your branch does not fall into this category), and they require written permission, you will have to notify residents, shut off the water, and representatives of the operating organization or water utility will work. In general, it’s still a hassle, which is why this method of solving the problem is used very rarely.

If there is no place for a common device, install sewer check valves on each plumbing fixture - separately on the toilet, bathtub, washbasin, sink, etc. This is if pipes from each of the devices go to the riser separately. If you have only two directions - to the toilet, and then to the bathtub-washbasin-sink, etc., then it will cost you to install two devices - one personal one on the toilet (the diameter coincides with the diameter of the outlet pipe) and the second - a common one, on a branch that goes to all other devices. Its size must match the diameter of the distribution pipe, and most often it is 50 mm.

See how to install a toilet with your own hands here.

Installation rules

The main thing to consider is the direction of movement of the wastewater. It is indicated on the body by a large arrow. The device must be rotated so that the normal direction of the drains coincides with the arrow. Further installation features are as follows:

• Installation of a plastic check valve on a sewer is carried out in a standard way for this type of pipe: there is a socket and a rubber seal. The straight edge of the pipe is inserted into this socket. Such a connection is already airtight, but for greater reliability, the joint can be additionally coated with plumbing silicone.
• Installation of cast iron models - using sealing rubber bands and bolts that tighten the mounting plates, there are models with sockets - for traditional installation on tow and filling the seam with sealant.
• It must be installed so that there is free access to the lid - periodically the check valve on the sewer becomes clogged, so it needs to be cleaned.

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Causes of clogged drains

It is naive to believe that clogged sewer pipes occur solely because large solid objects get into them. It is, rather, a trigger that activates a mechanism that has long been ready for work. Often the problem lies elsewhere.

Incorrect slope of outlet pipes

For normal operation systems require wastewater to move through the pipeline at a certain speed. It is provided by the slope laid down during installation of the structure. If it was initially insufficient or decreased as a result of subsidence of the foundation during operation, then the flow rate slows down.

In this case, larger solid inclusions will settle on the walls, since the water current will not be enough to move them. Sooner or later, these deposits will completely block the pipe gap. Almost the same thing happens if the slope is too steep: the water simply does not have time to carry away the waste.

Pipeline wear

Long-term operation of the system leads to gradual, uniform deposition of sediment on the pipe walls. The clearance inside the pipe is becoming smaller and smaller, and even if the flow rate is normal, it becomes easier for large inclusions to attach to the walls. They accumulate, harden and form a clog.

Installation of horizontal bends at right angles

Horizontal bends mounted at right angles dramatically change the configuration of the pipeline. This, in turn, changes the speed of the effluent. They can both speed up and slow down, which in any case will negatively affect the operation of the system and lead to the formation of a blockage.

We must not forget about correct operation structures, which also leads to problems. However, if in the latter case, cleaning the structure will be quite enough to get rid of the blockage, then troubles that occur for other reasons will appear with enviable regularity. That is why experts strongly recommend that everyone whose apartments are on the first two floors, as well as owners of private houses, install a shut-off valve for the sewerage system.

Check valve: installation methods and types of devices

There are two ways to prevent a sewage flood:

• by installing a separate locking device on each of the plumbing fixtures in the apartment;
• by installing one structure with high throughput on a common pipe.

You need to know that the second option is only suitable for private houses; for residents of high-rise buildings, it is best to use the first method.

There are two fundamentally different devices that are installed in the sewer system:

• non-return valve that prevents wastewater from flowing back;
• a vacuum valve that equalizes the pressure in the system. It is recommended to install in structures with a counter-slope, which is almost impossible to eliminate without completely reworking the pipeline.

Locking design: design and installation features

The assembly can be made of plastic or metal, with the first option being more common.

Principle of operation

The part is equipped with two pipes, outlet and intake. Between them there is a chamber with an air-filled element made in the form of a ball. You can see how it works in the illustration:

The unit needs regular cleaning, so it has a collapsible body. Cleaning is quite easy. It must be carried out regularly, otherwise, due to contamination on the inlet pipe seal, it will be impossible to shut off the pipe. The system can be mounted in both vertical and horizontal positions.

Basic installation rules

Before starting installation, you should determine the installation location, taking into account the need to ensure free access to the unit for cleaning and maintenance.

When choosing a device model, you need to use common sense and not buy a part just because you like the price. The costs of a quality valve cannot be compared with the cost of repairing an apartment in the event of flooding with sewage. In addition, you need to pay attention to the way the node is installed. Most often they are universal, but there are separate models designed only for horizontal or vertical installation.

One more nuance: before installation it is worth checking the valve for leaks. A cutout is required for installation. the right size in the pipeline and insert it into the pipe valve. If the sewage system is cast iron, then you will have to install adapters from metal to plastic. The part is installed strictly in accordance with the direction of fluid flow. Each valve has an arrow showing this direction. It should be facing the sewer.

Check air valve

According to SNiPs, a vent valve must be installed in all buildings with more than two floors, in this case the sewage system will work more efficiently, without unpleasant odor and noise. The unit performs the functions of a distribution and control device that allows you to automatically remove gases formed in the system and create an air flow.

How does the unit work and function?

The principle of operation of the element is quite simple. Let's look at how a sewer system works without a valve. When flushing the toilet or any other discharge of a large amount of liquid, a vacuum occurs in the pipeline. It forces the system to draw air to equalize pressure from the plumbing fixture where the water seal for the sewer is the smallest. This moment will be accompanied by a loud squelching sound and the appearance of an unpleasant odor. Vacuum valve equalizes pressure inside sewer system, letting in air when a vacuum occurs, and releasing gases formed inside the pipeline.

The standard part has a plastic housing with a side hole. The main structural element is a rod that lifts a side hole through which gases are released from the sewer. When the pressure decreases, the rod moves down and closes the hole. To prevent the element from rising higher than necessary, a rubber gasket is installed above it. There are units with a rubber membrane instead of a rod, but they require frequent replacement due to rapid wear of the rubber.

Manufacturers offer two types of air valves:

• 50 mm for sinks;
• 110 mm for a common riser.

It should be taken into account that the first unit can be installed only for one or two appliances, for example, a toilet and a sink.

Features of air valve installation

The part can only be installed in rooms with a constant positive temperature. If negative, the node will not be able to function. The installation location is selected depending on the presence of a drain in the floor. If there is a drain, then the valve is installed at a height of at least 35 cm from the floor.

The absence of a drain involves installing the device on a section of the pipeline located above the highest inlet of the drainage system coming from the plumbing equipment. Installation of the part is carried out by mounting it on the free end of the pipe or in a special socket.

It should be noted that installing a check valve on the sewer is a necessary measure. It will secure the apartment or a private house from the penetration of wastewater, unpleasant odors and noise. You can carry out the work yourself, having previously read the installation instructions, or entrust the installation to specialists. In any case, the result will be trouble-free operation of the sewer system.

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Types of valves for sewer pipes

A check valve is installed on the sewer system to block the rise of drains and their flow out of plumbing fixtures. If you do not install a water seal, you may suffer serious losses in the future. Since there are no obstacles for waste.

Types of valves for sewerage:

• Non-return sewer valve;
• Vacuum (air) plumbing valve.

The principle of operation of the device is to block the pipe passage using a membrane valve under the action of air pressure. The valve circuit includes a shutoff membrane. It creates a block for raising the drains back. The device also includes a lever for removing waste and a lid that is used for cleaning.

The check valve must be installed on the ground floor in apartment buildings. If the riser is dirty, this is the only way to protect the apartment from flooding with waste.

Features of the air valve for sewerage

SNiP regulations require the installation of an air valve on each sewer drain. If it is not possible to install an exhaust valve, use a ventilation element. The vacuum device is installed on a pipe with a diameter of 110 mm.

Air valve diagram:

• Equipment housing;
• Ventilation hole for air flow;
• Pressure regulation rod;
• Rubber gasket;
• Device cover.

The vacuum valve works on the following principle: equalizing the atmospheric pressure in the pipe, suctioning out excess rarefied air. When water enters the drain at a certain pressure, the shut-off valve cover opens. If the pressure stops, a spring is activated, which closes the lid.

The air valve performs an important function - noise protection.

The ventilation device is available in different materials. The most popular is plastic. It guarantees easy installation, easy to maintain, easy to clean, inexpensive, durable.

Types of air valves:

1. Auto. Has low throughput. Used in private homes for individual parts of the sewer system. Releases air that accumulates in the system.
2. Anti-vacuum. The most popular type. Used for various purposes. Lets air out and in.
3. Combined. Combines automatic and anti-vacuum functions.

Each type is selected according to the characteristics of the room. The combined type is used more often. It is installed on the sewer in the bathroom, in the kitchen.

Installation of an air valve on the sewer system against odor

To protect the apartment from unpleasant odors, an air valve is used. Its installation is quite simple. It must be mounted on a free part of the plumbing pipe.

Vacuum valve installation sequence:

1. We choose a place to install the shutter. The valve can be installed on any part of the device and for the entire sewer system. The air mechanism is installed at a distance of 20 cm from the nearest siphon and 30 cm from the pipe.
2. We fasten the valve to the pipe using the chosen method. Can use fittings, threads.
3. We check the tightness of the installation.
4. Operation of the sewer system.

Shut-off valves are installed inside the room, since they are used at temperatures not lower than 0 degrees. The device quickly pays for itself, as it protects plumbing from breakdowns and the apartment from unpleasant odors.

Problems during operation can be caused not only by a broken valve, but also by changes in the sewer system. For example, when installing a washing machine.

Thanks to air valves, the apartment not only prevents unpleasant odors, but also noise. This is a significant advantage of the device. Thanks to this, the most comfortable conditions are created in the house.

Characteristics of a toilet check valve

The check valve has the form of a special element that is mounted on the sewer riser. This part has a round shape, and the diameter matches the size of the pipe.

Characteristics of the toilet check valve:

1. The device is mounted not only on the toilet, but also on other plumbing fixtures;
2. The valve prevents waste from flowing back into the room;
3. The water seal blocks the penetration of unpleasant odors into the room;
4. Required for installation on the first floors of apartment buildings.

Installing a check valve on a toilet is not a difficult task. The shut-off device can be installed on the entire sewer system. Here you need to choose the right type of device and the place where the shutter will best cope with the tasks.

The check valve can only be used in a room with positive temperatures. The device will not work in cold weather.

Installation can also be carried out on one device. The toilet serves them. It is through this that wastewater can get back into the apartment. Also, for safety reasons, a shut-off valve is installed on the sink or bathtub.

For long-term operation, the mechanism must be cleaned periodically. The reinforcement cover can be easily removed and the necessary measures can be taken. The mechanism is also equipped with a shut-off valve, which makes it convenient to shut off the systems and perform cleaning.

Shut-off valve device for sewerage

Various materials are used in the manufacture of valves. They use stainless steel, cast iron, plastic, bronze. A part is purchased from a material similar to pipes. Most often they are plastic.

Apart from cleaning, the non-return valve requires no other maintenance.

Pipes in a residential area normally have a diameter of 50 mm. A shut-off valve is purchased the same size. The device is equipped with a special lid for easy cleaning and a lever to independently shut off the flow of waste.

Components of a shut-off valve:

• Connecting part - used for fastening to the pipe;
• The main part of the lock is the locking mechanism;
• Limiter lock;
• The final part is used for fastening to the outlet pipe.

If used properly, the locking device can last 50 years. In contrast to the purpose of use, I distinguish between different valve sizes. Devices with a diameter of 50 mm are used for pipes, 110 mm for toilets. Air valves are also used to prevent unpleasant odors.

When choosing a valve, pay attention to the strength and reliability of the design. The material must be able to withstand an aggressive environment. The valve cap should be easy to remove for cleaning. A lever must also be provided to independently shut off the sewer.

A water shut-off valve is often used to determine whether water flows in one direction only. This mechanism is useful for self-priming pumps and autonomous water supply. Shut-off valves prevent the return movement of the liquid that is pumped out by the pump back into the well or well.

Installing a check valve on the sewer

Installation on drainage system first provides right choice places. It is important that the valve is accessible. For its normal operation, the device must be periodically inspected and cleaned.

When purchasing a locking mechanism, do not rely solely on price. A cheap model will not satisfy you with quality, and if it breaks, it will lead to serious losses. After installation, make sure the device is tight. If it is broken, then the device is not of high quality.

When buying a check valve, you need to pay attention to the installation method. As a rule, many models are universal for any pipes. But there are options only for horizontal or vertical pipes. The valve diameter is also taken into account.

Check valve installation steps:

1. At the installation site, cut out a section the length of the valve;
2. The valve element is connected to the pipes;
3. It is necessary to pay attention to the direction of the arrows on the body, which should look towards the outlet;
4. After installation, the joints are treated with sealant.

At this point, the installation is complete and the device is ready for use. If you hear noticeable noise during operation, then the problem is a poor seal. The element will need to be replaced.

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The principle of its operation is the same as that of a nipple: it allows the flow to pass in one direction, but does not allow them to pass back. In other words, if the sewer system suddenly becomes clogged, waste will not enter your home. The diameter of such a valve may vary, so it must be selected based on the diameter of the sewer pipes. For example, in order to connect to the central riser, you will need a valve of 11 centimeters, and in other places you usually need a smaller valve, often no more than 5 centimeters.

These valves are made of stainless steel, brass, cast iron and bronze. Regarding metal valves, today they are practically not used (the reason for this is unreliability and high cost). For internal installation, the most popular material is polypropylene, and for external installation - PVC.

There are several places where you can install a check valve for the sewer system, everything will depend on your goals. In most cases, it is found near the entrance to the riser. We also note that it must be installed for each apartment separately, on an individual basis. But why, you ask, not install a common valve for the entire riser? In this case, the whole point is that if the riser becomes clogged, the waste will rise up the pipe. Thus, the residents of the first floor are flooded. So if you live on the ground floor, don’t hesitate to install such a valve for yourself - it will protect you from such troubles.

In addition to the valve described above, others of a smaller size are often used. They are placed in front of every type of plumbing fixture, for example, in the bathroom. Their capacity is somewhat less, but for small housing this will be quite enough. In addition, it is highly recommended to install such a valve if the drain pipes in your system have a reverse slope.

Stages of installing a check valve in a sewer system

In order to choose a specific model in a store, you must rely on the following data:

1. The amount of money you can spend on it.
2. Material used in the manufacture of the valve.

Stage one

It is worth noting that even the cheapest and most primitive valve copes well with the task. You just need to know the exact diameter of your sewer pipes and purchase a model of the right size. But if the diameters differ (when the measurements were taken incorrectly), then special adapters can be used, but it is advisable to avoid such a problem, since we do not need unnecessary connections.

Stage two

If it is necessary to install a large check valve for sewerage directly next to the riser, then it is advisable to do this in a horizontal position, but the vertical position is not used so often, and such an installation is not recommended.

Stage three

After purchasing a valve, you may notice that on its body (as on the body of all similar products) there is a special arrow that will indicate the direction of water movement through the pipes. It is important that this arrow is in mandatory headed towards the sewer riser. It is best to install such a valve at the same time that the old sewer pipes will be replaced.

Stage four

If you have already replaced the pipes before, you will have to cut in the valve. Before you start tapping, you should turn off all water. After disconnecting, we cut out a piece of pipe of a certain size and install a check valve there.

Stage five: We proceed directly to installation.

In fact, this process is not too complicated. Each valve has two holes equipped with rubber seals, to each of which you need to connect a cut pipe.

After installation is completed, you must ensure that the tightness of the connections is at the proper level. To do this, you need to turn on the water and observe the joint for several minutes. If the sewer check valve vibrates, you will have to redo everything all over again.

Benefits of a check valve

As we have already said, such a valve is intended primarily to obstruct waste flows going in the opposite direction in case of clogging. Thus, the technical and sanitary indicators of the building are significantly improved. The advantages of check valves include the following:

1. They close quietly.
2. There is no water hammer.
3. Such devices can be equipped both horizontally and vertically.
4. Minor resistance.
5. The loss of fluid pressure is halved.
6. And, of course, excellent tightness.

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What it is

It’s not hard to guess what a check valve is. Obviously, this is a device that allows the working medium to move in only one direction. Check valves are widely used in the installation of water supply and heating systems, so their concept will not seem unusual to the reader.

The use of this product for wastewater requires, however, some adaptation:

1. The valve should open and close at minimum pressure. As you know, in most cases, domestic sewerage is gravity-flow;

Valves that require significant excess pressure to open (for example, ball valves) can be used in pressure sewer systems. They are installed at the beginning of the pressure section immediately after the pump and prevent the reverse movement of wastewater after it stops.

1. Since the valve and seat will inevitably become overgrown with grease, sediment and other deposits, the valve must be easy to open for maintenance.

Typical valve materials are plastics, primarily unplasticized polyvinyl chloride (UPVC) and polypropylene. As a rule, products are marked by color: valves intended for internal sewerage are gray, for external installation - orange.

Valves are single-chamber (with one damper) and double-chamber (with two dampers). For obvious reasons, the latter are more reliable: even if a dirty seat of one damper prevents it from closing completely, the second one will ensure tightness.

A check valve can often be found on sale under another name - a sewer valve.

Many valves provide manual control: the damper can be forced into a fully closed state.

In addition to mechanical ones, many manufacturers offer electrified devices. The servomotor, which blocks the path of the drains with a damper, starts after the filling sensor is triggered. Electrified devices are often equipped with batteries that provide long-term (up to a week) autonomous operation during power failures.

Installation goals

Why do you need a valve in the sewer?

To ensure that, if clogged, the drains from the upper floors do not enter the rooms below. The principle of communicating vessels works here: as soon as the outlet to the well or collector ceases to perform its functions, wastewater begins to pour out through the plumbing fixture located below the others. Once you install a valve in front of it, the sewage will have to find another way.

In addition to the reverse movement of wastewater, valve flaps prevent the movement of rats and mice through the sewer system. In the absence of drains, the valve is completely closed, and when water is drained, it is raised just enough to allow the flow to pass.

Air (vacuum) valves, which prevent the breakdown of water valves on devices connected to unventilated risers, are also reverse in design.
They allow air to pass in only one direction - inside the riser, compensating for the vacuum that occurs in it during flushing.

Installation location

Correct location

Where exactly are the valves mounted?

• Their most typical location is at the outlet into the well of the sewer network of the basement or ground floor. Such premises must be equipped with a separate outlet; alternatively, the outlets can be combined after the check valve. When backing up the yard sewer, the sides of the plumbing fixtures will be below the edges of the well; however, thanks to the valve, the room will not be flooded;

According to the requirements of SNiP 2.04.01 - 85, electrified valves must be installed at the sewerage outlet of the basement and basement floors, which, when activated, send a signal to the dispatcher's console.
An exception is premises used 24 hours a day: they may have manually operated valves.

• In an apartment on the first floor of an apartment building, valves can be installed after individual plumbing fixtures. Thus, a 110 mm PVC sewer check valve can be installed after the toilet, and 50 mm devices can be installed on the outlets for connecting a bathtub, washbasin and sink. An even simpler solution is to install a common shutter with a diameter of 110 mm at the entrance to the apartment, immediately after the tee or cross;

• In a private house connected to a central sewer, the valve can be installed before discharge to a well with inside foundation. Of course, its location should be convenient for maintenance: once every 3 - 6 months, the hatch of the device is opened to clean the seat and valve from grease and other deposits.

Wrong location

I strongly advise against placing a vertical valve (as well as various garbage traps that block the mesh pipe under inspection covers and other makeshift devices) into the gap in the sewer riser.

What is the instruction related to?

Because the damper, even in the fully open position, represents an obstacle to the drains, there is unevenness inside the pipe. It will inevitably collect large-sized debris traveling along the riser, primarily rags dropped into toilet bowls. Yes, their entry into the sewer is a gross violation of the norms of its operation; however, we live in a far from ideal world, and we have to come to terms with reality.

As a result, the valve will provoke frequent blockages of the riser with support at the level of your floor. Where it leads?

1. To flooding of your own apartment, but not through plumbing fixtures, but from above - through the ceiling;
2. To the inevitable, like the collapse of capitalism, damage to the valve flap when clearing the next blockage. Sewer wire is a fairly durable tool that can withstand great force when used;

In especially difficult cases, blockages are cleared by lowering a crowbar on a rope into the riser through a drain pipe on the roof.
It’s easy to guess what will happen to the valve blade.

1. To draw up an act on unauthorized changes in the configuration of the public utility network with an invoice for the restoration of the riser, and, possibly, for repairs from the neighbors above.

Why do I pay so much attention to the incorrect installation of the valve in the riser? Yes, simply because when he was a plumber, he often had a big and bright feeling with a variety of valves and traps installed so that the upper neighbors themselves reaped the fruits of improper use of the sewer system. Alas, they do much more harm than good.

Installation technique

How to install a check valve correctly? The simplest case— installation of a cuff valve after the toilet.

It consists of three stages:

As always, there are a couple of nuances:

1. The toilet must be connected to a pipe with a straight section after the socket. The damper should not rest against the outlet wall;
2. You should not assemble connections using sealant and sit the toilet on cement or mastic. Sooner or later the valve will need cleaning.

Check valves with socket connections are installed in the same way as any other plastic fitting: a smooth section with a chamfer removed is inserted into the socket with an o-ring rubber seal. To simplify assembly, you can apply liquid soap or any other water-based lubricant to the seal.

Of particular interest is the installation of a valve into a gap in a previously assembled sewer section. In this case, we will need an additional shaped element - a compensating pipe. It is a short pipe with an elongated socket.

The installation sequence will be as follows:

There are a couple of nuances here:

1. On a cut pipe, the burrs on the inside must be cleaned off and the outer chamfer removed. Burrs can trap debris when drains are running, increasing the likelihood of a clog. The chamfer will help to assemble the socket joint with minimal effort;

1. After assembling the sewer system, the socket of the check valve must be fixed with a separate clamp. Thus, we will prevent spontaneous uncoupling of the connection when the sewer is backed up: the compensator is able to move upward along the pipe.

Is it possible to install a check valve where there is no socket? Of course. To do this, in addition to the compensator, we will have to purchase a sewer coupling.

It is mounted on a pipe cut to size below the valve installation location. Further actions are no different from those described above.

Study of samples

I told where and how sewer check valves are used, but did not mention what they are like and how much they cost. I will hasten to correct this defect. As an object for research, I will focus on the products of the company Hutterer & Lechner - not the cheapest, but certainly one of the highest quality in the post-Soviet space.

HL valve flaps with a diameter of 110 mm and larger are made of stainless steel and are capable of withstanding significant deforming loads.
Its semicircular shape makes the valve more resistant to high backflow pressures.

Senior in model range The HL valve is equipped with an electric drive powered by a 220-volt network and a battery that provides autonomy for up to 7 days. The connection is bell-shaped, with a diameter of 110 mm. In addition, the manufacturer offers valves with a diameter of 160 and 200 mm.

Here are the most interesting features of the device to consumers:

• The closing force thanks to a 300-watt electric motor reaches 50 kgf. Large fractions of waste water trapped between the valve and the seat cannot prevent it from closing: they are simply ground up;
• The damper closing time is 11 seconds;
• The control unit with a standard cable can be placed 6 meters from the gate;
• The damper can be closed forcibly not only manually, but also from the remote control;
• The valve design allows for horizontal installation only.

The retail price of the shutter is 102,970 rubles.

The cost of the products I cited as samples is, let’s say, far from budget. To avoid scaring the reader upcoming expenses, I will introduce him to a couple of domestically produced valves.

This Novosibirsk-made valve is also intended for internal and external sewerage. Like the previous device, it provides for manual locking of the damper in the closed state and the possibility of servicing through the service hatch.

Unlike TP85, here you will need a tool to open the hatch - an open-end or socket wrench. The cost of the valve is even more attractive: it will cost the buyer only 1,500 rubles.

22029 0 5

Not a step back: non-return valve for sewerage

In this article I am going to introduce the reader to one of the types of shut-off and control valves for sewerage - a check valve. We will find out what functions it can perform and how it works. In addition, I will talk about in what cases it is worth installing a check valve for sewerage - 50 mm, 110 and other sizes, and when it will be useless.

Check valves of the most common sizes are 50 and 110 mm.

What it is

It’s not hard to guess what a check valve is. Obviously, this is a device that allows the working medium to move in only one direction. Check valves are widely used in the installation of water supply and heating systems, so their concept will not seem unusual to the reader.

The use of this product for wastewater requires, however, some adaptation:

1. The valve should open and close at minimum pressure. As you know, in most cases, domestic sewerage is gravity-flow;

Valves that require significant excess pressure to open (for example, ball valves) can be used in pressure sewer systems. They are installed at the beginning of the pressure section immediately after the pump and prevent the reverse movement of wastewater after it stops.

1. Since the valve and seat will inevitably become overgrown with grease, sediment and other deposits, the valve must be easy to open for maintenance.

Typical valve materials are plastics, primarily unplasticized polyvinyl chloride (UPVC) and polypropylene. As a rule, products are marked by color: valves intended for internal sewerage are gray, for external installation - orange.

Valves are single-chamber (with one damper) and double-chamber (with two dampers). For obvious reasons, the latter are more reliable: even if a dirty seat of one damper prevents it from closing completely, the second one will ensure tightness.

A check valve can often be found on sale under another name - a sewer valve.

Many valves provide manual control: the damper can be forced into a fully closed state.

In addition to mechanical ones, many manufacturers offer electrified devices. The servomotor, which blocks the path of the drains with a damper, starts after the filling sensor is triggered. Electrified devices are often equipped with batteries that provide long-term (up to a week) autonomous operation during power failures.

Installation goals

Why do you need a valve in the sewer?

To ensure that, if clogged, the drains from the upper floors do not enter the rooms below. The principle of communicating vessels works here: as soon as the outlet to the well or collector ceases to perform its functions, wastewater begins to pour out through the plumbing fixture located below the others. Once you install a valve in front of it, the sewage will have to find another way.

In addition to the reverse movement of wastewater, valve flaps prevent the movement of rats and mice through the sewer system. In the absence of drains, the valve is completely closed, and when water is drained, it is raised just enough to allow the flow to pass.

Air (vacuum) valves, which prevent the breakdown of water valves on devices connected to unventilated risers, are also reverse in design.
They allow air to pass in only one direction - inside the riser, compensating for the vacuum that occurs in it during flushing.

Installation location

Correct location

Where exactly are the valves mounted?

• Their most typical location is at the outlet into the well of the sewer network of the basement or ground floor. Such premises must be equipped with a separate outlet; alternatively, the outlets can be combined after the check valve. When backing up the yard sewer, the sides of the plumbing fixtures will be below the edges of the well; however, thanks to the valve, the room will not be flooded;

According to the requirements of SNiP 2.04.01 - 85, electrified valves must be installed at the sewerage outlet of the basement and basement floors, which, when activated, send a signal to the dispatcher's console.
An exception is premises used 24 hours a day: they may have manually operated valves.

• In an apartment on the first floor of an apartment building, valves can be installed after individual plumbing fixtures. Thus, a 110 mm PVC sewer check valve can be installed after the toilet, and 50 mm devices can be installed on the outlets for connecting a bathtub, washbasin and sink. An even simpler solution is to install a common shutter with a diameter of 110 mm at the entrance to the apartment, immediately after the tee or cross;

• In a private house connected to a central sewer, the valve can be installed before discharge to the well from the inside of the foundation. Of course, its location should be convenient for maintenance: once every 3 - 6 months, the hatch of the device is opened to remove grease and other deposits from the seat and flap.

Wrong location

I strongly advise against placing a vertical valve (as well as various garbage traps that block the mesh pipe under inspection covers and other makeshift devices) into the gap in the sewer riser.

A check valve in the riser is a bad idea.

What is the instruction related to?

Because the damper, even in the fully open position, represents an obstacle to the drains, there is unevenness inside the pipe. It will inevitably collect large-sized debris traveling along the riser, primarily rags dropped into toilet bowls. Yes, their entry into the sewer is a gross violation of the norms of its operation; however, we live in a far from ideal world, and we have to come to terms with reality.

As a result, the valve will provoke frequent blockages of the riser with support at the level of your floor. Where it leads?

1. To flooding of your own apartment, but not through plumbing fixtures, but from above - through the ceiling;
2. To the inevitable, like the collapse of capitalism, damage to the valve flap when clearing the next blockage. Sewer wire is a fairly durable tool that can withstand great force when used;

In especially difficult cases, blockages are cleared by lowering a crowbar on a rope into the riser through a pipe on the roof.
It’s easy to guess what will happen to the valve blade.

1. To draw up an act on unauthorized changes in the configuration of the public utility network with an invoice for the restoration of the riser, and, possibly, for repairs from the neighbors above.

Why do I pay so much attention to the incorrect installation of the valve in the riser? Yes, simply because when he was a plumber, he often had a big and bright feeling with a variety of valves and traps installed so that the upper neighbors themselves reaped the fruits of improper use of the sewer system. Alas, they do much more harm than good.

Installation technique

How to install a check valve correctly? The simplest case is installing a cuff valve after the toilet.

It consists of three stages:

Installation of the valve - cuff.

As always, there are a couple of nuances:

1. The toilet must be connected to a pipe with a straight section after the socket. The damper should not rest against the outlet wall;
2. You should not assemble connections using sealant and sit the toilet on cement or mastic. Sooner or later the valve will need cleaning.

Check valves with socket connections are installed in the same way as any other plastic fitting: a smooth section with a chamfer removed is inserted into the socket with an o-ring rubber seal. To simplify assembly, you can apply liquid soap or any other water-based lubricant to the seal.

Of particular interest is the installation of a valve into a gap in a previously assembled sewer section. In this case, we will need an additional shaped element - a compensating pipe. It is a short pipe with an elongated socket.

The photo shows a compensating pipe with a diameter of 110 mm.

The installation sequence will be as follows:

Installation of the valve - cuff.

There are a couple of nuances here:

1. On a cut pipe, the burrs on the inside must be cleaned off and the outer chamfer removed. Burrs can trap debris when drains are running, increasing the likelihood of a clog. The chamfer will help to assemble the socket joint with minimal effort;

1. After assembling the sewer system, the socket of the check valve must be fixed with a separate clamp. Thus, we will prevent spontaneous uncoupling of the connection when the sewer is backed up: the compensator is able to move upward along the pipe.

Is it possible to install a check valve where there is no socket? Of course. To do this, in addition to the compensator, we will have to purchase a sewer coupling.

It is mounted on a pipe cut to size below the valve installation location. Further actions are no different from those described above.

Study of samples

I told where and how sewer check valves are used, but did not mention what they are like and how much they cost. I will hasten to correct this defect. As an object for research, I will focus on the products of the company Hutterer & Lechner - not the cheapest, but certainly one of the highest quality in the post-Soviet space.

HL valve flaps with a diameter of 110 mm and larger are made of stainless steel and are capable of withstanding significant deforming loads.
Its semicircular shape makes the valve more resistant to high backflow pressures.

The senior valve in the HL model range is equipped with an electric actuator powered by a 220-volt network and a battery that provides autonomy for up to 7 days. The connection is bell-shaped, with a diameter of 110 mm. In addition, the manufacturer offers valves with a diameter of 160 and 200 mm.

Here are the most interesting features of the device to consumers:

• The closing force thanks to a 300-watt electric motor reaches 50 kgf. Large fractions of waste water trapped between the valve and the seat cannot prevent it from closing: they are simply ground up;
• The damper closing time is 11 seconds;
• The control unit with a standard cable can be placed 6 meters from the gate;
• The damper can be closed forcibly not only manually, but also from the remote control;
• The valve design allows for horizontal installation only.

The retail price of the shutter is 102,970 rubles.

The cost of the products I cited as samples is, let’s say, far from budget. In order not to scare the reader with upcoming expenses, I will introduce him to a pair of domestically produced valves.

A product with the laconic name “outer check valve 110 mm”.

This Novosibirsk-made valve is also intended for internal and external sewerage. Like the previous device, it provides for manual locking of the damper in the closed state and the possibility of servicing through the service hatch.

Unlike TP85, here you will need a tool to open the hatch - an open-end or socket wrench. The cost of the valve is even more attractive: it will cost the buyer only 1,500 rubles.

Conclusion

I hope that I was able to help the reader in choosing the optimal solution for his conditions. The video in this article will help you get a better idea of ​​how you can install a check valve for a sewer system with your own hands. Please feel free to leave your additions and comments here. Good luck, comrades!

If you want to express gratitude, add a clarification or objection, or ask the author something - add a comment or say thank you!

Good afternoon, dear reader! Problems due to blockages in the sewerage of high-rise buildings arise quite often, and this happens due to the carelessness of those living in the neighborhood, who can use it to dump various items and poorly soluble waste. They, and the “lucky” owners of lower-level apartments, begin to spout sewage from their toilets.

The consequences of this flood are much worse than from flooding plain water, because the foul-smelling liquid can spread throughout the floor of the entire apartment. To protect yourself from such a nuisance, you need to install a check valve for the sewer system.

A check valve, just like a valve or gate valve, is a shut-off valve and is used to block wastewater in a sewer pipeline if it flows in the opposite direction to plumbing fixtures.

Purpose and scope of application

Such devices are usually installed in the bathrooms of the first and second floors of multi-storey buildings on taps for connecting plumbing fixtures. It stops the backflow of fecal water into the room in case of.

Most often, traffic jams form in the basement in pipes located horizontally. Then all the drains begin to rise to the first accessible exit point - the toilet in the first floor apartment. The valve prevents unpleasant consequences blockage, blocking the lumen of the sewer pipe and the connection point of the device. However, wastewater can rise even higher through the riser - to the plumbing fixtures on the second floor. Therefore, a sewerage system for second-floor apartments is also necessary. The drain column usually does not rise above this level - it will already be able to push through the plug and the water will drain away.

In cottages connected to a centralized main, the valve is installed before discharge to the sewer well from the inside of the foundation structure.

Such a device is also necessary for autonomous drainage systems of private houses and cottages with drainage into a drainage pit or with an installed septic tank. A check valve is also used to drain condensate from an air conditioner, excess water from water heaters, drain ventilation of baths, saunas, etc.

Controls and technical characteristics

The device can be controlled in two ways:

• mechanical;
• in an automatic way.

The main technical characteristics of check valves include:

1. nominal diameter (DN) - cross-sectional size of the openings of the connecting pipes (from 50 mm to 300 mm);
2. nominal pressure (PN) - the value of the highest excess pressure of the working medium at a temperature of 20ºС;
3. coefficient bandwidth(Kvs) - water consumption (m³/h) with a temperature of 20ºС;
4. operating temperature range - depends on the materials used and is indicated in technical conditions for specific samples;
5. installation type - horizontal or vertical;
6. type of connection to the pipeline.

Connection type

The product can be connected in two ways:

• For a common sewer pipe - a valve with a diameter of 110 mm or more, with greater throughput;
• for the outlet of each plumbing fixture. Internal wiring is usually made from pipes with a diameter of 50 mm. The valves should have the same dimensions. If the system circuit is assembled from pipes with a diameter of 32 mm or 40 mm, special adapters are used when connecting a device with DN = 50 mm.

The devices are installed at the junction of pipes, turning 90º both inside and outside buildings.

According to the method of connection to the process, they are divided into:

• threaded;
• coupling;
• flanged;
• for welding.

Device

The valve design consists of a hexagonal body, the cavity of which is divided into several zones:

• the receiving part located before the shut-off organ. This area is intended to connect the inlet to the wastewater pipeline;
• limiter. Provides unhindered passage of drain water in only one direction and locks the valve in case of reverse movement;
• a locking device fixation system with an additional function of an inspection hatch;
• graduation part. It is designed to ensure the exit of liquid from the restrictor area and the connection of the device to the outlet line.

The design of all working zones comes in different design options, but the operating principle is the same for all models of check valves.

Principle of operation

The principle of operation of a check valve is based on blocking the passage with a shutter element under the influence of a wastewater flow moving in the opposite direction.

If the flow of liquid stops, then the pressure of the medium in the inlet pipe is compared with the pressure in the outlet pipe of the device, and the shutter body, under the influence of gravity, the compression force of a spring or a lever-load mechanism, blocks the passage, closing the valve.

Types and designs

There are several types of check valves on sale that prevent wastewater from flooding the premises. They are divided by:

• design features - lifting, ball, wafer;
• material for manufacturing body parts - steel, cast iron, plastic;
• the size of the inlet and outlet openings.

Air dampers are used to block unpleasant odors from pipes and stabilize air pressure in the system. They are installed in houses where there is no drain pipe, and are placed at the highest point of the system in a vertical position or at a height (h1) of at least 35 cm from the drain.

Rotary paddle

The working body of valves of this type is a spring-loaded membrane (plate). It has the shape of a round petal, which is why the device got its name. If the flow of wastewater moves towards the outlet in the direction of the sewer riser, the membrane rotates, simultaneously moving to the upper part of the housing, and opens the passage hole. When the water flow moves in the opposite direction, it is pressed against the rim in the body cavity, closing the passage hole tightly and hermetically.

Some models are equipped with a manual shutter - a second plate, which is controlled by a push-button system located on the body.

The upper part of the device body has a removable cover for quick cleaning of the internal walls and mechanisms.

Wafer

This type of locking device has small dimensions. The body is made in the form of a hollow cylinder, inside of which there is a butterfly valve. It may take the form of a small disk, which is attached in one place by a spring to the wall of the housing, or consist of two doors attached to a rod passing through the center of the device.

The presence of seals on the valve body allows installation of the device without the use of additional gaskets. The device can be placed on vertical and horizontal sections of pipelines.

Lifting

This model of check valve is named after the method of operation of the shut-off element, since when drainage flows from plumbing fixtures into the drainage system, the shut-off moves upward. This happens under the action of a compression spring, which is pressed against by wastewater. Stopping the movement of drains in the “correct” direction leads to the spring unclamping and blocking the passage. When liquid waste enters from the reverse side, the passage is only blocked more tightly due to the nonlinear shape of the housing.

Due to the complex configuration of the housing, the device is more susceptible to clogging and requires regular maintenance, which consists of removing the cover and unscrewing four bolts, cleaning or replacing the mechanism.

Ball

A device with a ball-shaped locking element, which, when the waste flows in the desired direction, moves into a special recess inside the body, opening the passage hole. When the flow stops, it returns to its place and blocks the cross section. When wastewater moves in the opposite direction, it blocks the lumen of the pipe.

However, due to this shape of the valve, liquid may leak during flooding, since the ball and the side wall do not always fit tightly to each other.

But it will be able to stop the main part of the reverse flow and will certainly prevent mass flooding.

Differences

Compact ball and rotary reed valves with a diameter of 50 mm are common in domestic systems. They can withstand quite a bit high pressure, arising in systems of multi-storey buildings.

Wafer products with a diameter of 160 millimeters or more have more impressive dimensions and are used primarily for working with large drainage and sewer systems of industrial enterprises.

Advantages and disadvantages

Such devices have the following advantages:

• simple design;
• simple installation and maintenance process;
• efficiency;
• the ability to prevent flooding of the premises with sewage;
• reliability and durability.

The only downside is the rather high cost of the products and susceptibility to contamination.

You need to buy a device that has:

• reliable design, made of durable materials that are resistant to aggressive environments and easy to maintain (have an easily removable cover for cleaning body parts);
• automatic shut-off mechanism for reverse flow of wastewater;
• manual adjustment in case of emergency.

In addition, the diameter of the valve bells must correspond to the diameter of the pipeline section where it will be installed.

approximate price

The price of the product is influenced by:

1. material used in production;
2. design features;
3. connection method;
4. manufacturer company.

For example, a cast iron product with a diameter of 160 mm with a receiving type design can be purchased for $120 - $130, a PVC device with similar characteristics costs less, ranging from $70 - $90. The price of a PVC ball valve usually does not exceed $50 - $80.

Rules for installation and operation of the device

Check valves with a spring mechanism can be installed on the pipeline in any position; non-spring-loaded products are placed on a vertical pipe when the drains move from bottom to top or on a horizontal section of the system. In front of all types of devices, except for the ball valve, it is necessary to install a mesh filter to protect against large particles in the drains. If it is necessary to install such a product for a pressure sewer system, then it is placed after the pumping equipment.

The installation location must be chosen so that the device body is not exposed to bending, torsion, tension or compression loads from the connected pipes.

The device operates to pass flow in one direction only, the direction of which is indicated by an arrow on the body of the product. During installation, the valve must be placed in the specified direction.

You must work with the device carefully so as not to disturb paintwork body, which not only performs a decorative function, but also protects against corrosion.

Required tools and materials

To install a locking device with your own hands, the following tools and consumables are sufficient:

• wrench or torque wrench;
• roulette;
• fum - ribbons and flax fiber;
• special sealant.

Connection diagram

Installation schemes for check valves are developed in accordance with technical characteristics device and a description of the conditions for its further operation. In the photo you can see examples of the location of the device:

• to protect the washing machine;

• on an external sewer pipe.

Work progress

If you plan to install a check valve in a residential high-rise building, you must:

• 24 hours before the start of installation, notify all residents about the upcoming work;
• perform a shutdown using valves installed in the inlet section of the cold and hot water supply to prevent unauthorized entry of water into the sewerage system circuit;
• notify all neighbors immediately about the very beginning of work to replace the device;
• After completing installation of the product, turn on the water in the entrance.

The work itself on installing a device with a threaded connection type is carried out in the following sequence:

• choose a location for installing the device and cut out a part of the pipe there that is equal in size to the length of the valve;
• cut threads at the ends of the pipes;
• clean the remaining chips;
• take a strand of flax fiber of such length as to ensure the number of windings is 1.5 - 2 times greater than the number of thread turns and lay it clockwise, wrapping the entire length of the threaded section;
• apply a layer of sealant over the wound flax;
• Screw on the valve and tighten the fastening using a wrench or torque wrench.

A useful video on the process of installing a locking device in a bathroom can be viewed in the video:

Frequent errors and problems during installation

Among the most common mistakes when installing a shut-off device in a sewer are:

• violation of the alignment of the pipeline at the installation site of the check valve, since any misalignment leads to a violation of the tightness during operation;
• the direction of opening of the valves of the installed device does not correspond to the direction of flow of the transported medium;
• lack of convenient access to the product for maintenance.

• choose a valve based not on its lower price, but on its quality, since the costs of purchasing a device are not comparable to the costs of repairing a home if it is flooded with sewage;
• Before installation, be sure to check the device for leaks. If it is not sealed enough, noise and vibration will be heard during operation. To fix the problem, you need to remove the cover and replace the edging or the shutter itself;