Pumps

How to choose and install a non-return valve for sewage with your own hands? Valves are sewer The locking valve for the sewerage of 110 mm.

At times, we are faced with a situation where their contents flow through the sewer pipes 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. It is possible to avoid such trouble. You need to put a check valve on the sewer. This simple but effective device completely blocks the reverse flow of drains.

Why and who needs it

The purpose of the sewer check valve is to block the flow of fluid going in the opposite direction. In this regard, the main area of \u200b\u200bapplication looms - lower-floor apartments in high-rise buildings, especially in old buildings.

In multi-storey buildings, the owners of apartments on the first floors very often have problems with toilet bowls, from which the contents of the sewer flow. 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 available point - the toilet bowl, spill onto the floor, sometimes even bathtubs and washbasins are filled. Here, to solve this problem, it is necessary to put a check valve on the sewer. It will cut off the return flow going to your apartment. True, those who live on the floor above will have a problem - fecal water can even rise there. Then they will also have to install a sewer check valve. Above this level, the drain column usually does not rise - it pushes through the cork, everything goes away.

However, residents of high floors should not rejoice - they can also suffer. Sometimes blockages happen somewhere between floors. This comes mainly due to violations of the rules for the operation of the sewer - someone lowers objects that should not be there, they get stuck, a traffic jam forms. In this case, toilet bowls on any floor can “gush” - it depends on where the blockage has formed. So on any floor, except for the last one, it makes sense to put a check valve - “just in case”.

The third group of consumers are the owners of private houses. In principle, the sewerage of a private house should be designed so that the reverse flow of drains is impossible. Even so, many prefer to play it safe than to scoop out foul-smelling "treasures" from the house later. The non-return valve for the sewer in a private house also performs another function - it does not allow rodents and other living creatures to penetrate through the sewer pipe.

Types of check valves and the principle of their operation

The main task of the check (shut-off) valve is to block the flow going in the opposite direction. To do this, a movable barrier is placed in these mechanical devices. The basic principle of operation is that in a calm state, the mechanical damper is lowered down, blocking the lumen of the sewer pipe and preventing the reverse flow from passing. When drains appear, it rises (moves to the side), the drains leave, and it closes again. By the type of this barrier and the principle of its operation, this equipment differs.

Swivel (petal)

In sewer valves of this type, a spring-loaded round membrane (plate) is installed. If the flow moves in the “right” direction, it turns, rising up does not prevent drains from leaving. If the movement starts in the other direction, the membrane (plate) is pressed against the rim inside the valve, tightly and hermetically blocking the pipe lumen. 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 “slams” - this is because of the way they work - the membrane slams 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 be able to quickly eliminate blockages, a removable cover is made in the upper part of the check valve body. By removing it, the problem can be quickly eliminated.

Lift check valve for sewerage

This type of locking device for a sewer pipe is so named because when the drains pass in the “correct” direction, the locking element rises. Drains press on the plate blocking the passage, compressing the spring, which rises. There are no drains - the spring is unclenched, the passage is locked. When effluents come in from the "wrong" side, there is no way to open the passage. This is achieved by a non-linear hull shape.

The lift check valve is more reliable, but its design is such that it often clogs and requires periodic cleaning. Why do you need to remove the cover (unscrew 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 in such a way that when passing drains, the ball rolls into a special recess in the body, opening the passage.

When it is dry in the pipe, it blocks the 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 body do not always fit perfectly, which leads to the fact that some of the drains still seep through. But mass flooding and a geyser from the toilet will not be for sure.

Why do you need an air valve in the sewer and how to put it, read.

Wafer type

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

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

What are they made of and what sizes are there?

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 in size. Exactly the same situation with cast iron. The point is not that the materials do not fit, but the need for additional adapters that make the design even more cumbersome.

According to the installation method, the shut-off valve for the sewer can be horizontal and vertical. Choose 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 given in the table.

Name/manufacturer	Diameter	Body/flap material	Application area	Price	Notes
VIEGA / Germany	110 mm	polypropylene/polypropylene	Outdoor sewerage	150$	Two shutters, the second with manual blocking
CAPRICORN / Poland	50 mm	polypropylene/polypropylene	Internal sewerage	25$	single valve
Mc Alpine / Scotland	32,40,50,90,110 mm	plastic	Internal wiring	11-21$	Has small dimensions
Capricorn / Poland	110 mm, 160 mm	ABS/stainless steel	Universal	53-84$	Emergency manual closing
Ostendorf / Germany	50 mm / 110 mm	PVC/PVC	Universal	13-24$	Emergency manual override
Politron / Russia	110 mm	Polypropylene	outdoor installation	14$	Emergency manual override
Politek / Russia	110 mm	Polypropylene	outdoor installation	23$	Emergency manual override

When and where to put

As already mentioned, the sewer check valve is a rather bulky 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 bowl.

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

In this case, it is often necessary to break the floor, the tiles already laid - it is necessary to combine the holes in the body with the pipes, center everything, follow the required angle of inclination. Such a prospect is especially “pleasing” if a renovation has recently been made. In this case, there is also an option - to embed a check valve in the riser above your entrance. But for such work - interference in the general house system (the installation of plumbing fixtures on your branch does not fall under this category), and they require written permission, you will have to notify the residents, turn off the water, representatives of the operating organization or the water utility will work. In general, it’s still a hassle, because this method of solving a problem is used very rarely.

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

Installation rules

The main thing to consider is the direction of movement of effluents. It is marked with a large arrow on the body. The device must be rotated so that the normal direction of the drains coincides with the arrow. The following are the features of the installation:

The sewer check valve is a device that prevents the apartment from flooding as a result of sewer blockages or other malfunctions.

Before buying a 110 or 50 mm sewer check valve, it is important to understand the features of various types of locking mechanisms, their principle of operation. It is also recommended to find out all the information about the existing sewer system.

Installation is quite simple, additional equipment is usually not required.. It is important to purchase the device at trusted points of sale, as well as by all means make sure that there is a guarantee from the manufacturer.

Why do you need a device

A sewer check valve is a device that is specifically designed to prevent leakage and reverse movement of water due to sewer clogging. Sometimes even a package that accidentally gets into the pipeline leads to blockages and flooding of the apartment.

To protect the room from the reverse movement of the sewer system, a special valve is installed that works automatically. A similar mechanism is used not only in the office, cottages, residential buildings and industrial premises, but also in heating and water supply systems (for the pump).

Their principle of operation is quite simple: if the waste liquids begin to move in the opposite direction, the locking mechanism stops this movement, as a result of which flooding does not occur.

In most cases, the need to install the device arises in such situations:

regular entry into the sewer system of debris and large objects, as well as other violations of the rules of operation;
a long period of use of the pipeline, during which a layer of fat with dirt particles has formed on the inner surface. This significantly increases the likelihood of clogging;
too large or small slope of the sewer pipeline, because to ensure free gravity of the liquid, it is important that a certain speed of movement of effluents is observed;
outlets at a perpendicular angle to the sewer pipe. As a result, the speed of water movement changes dramatically and water blockage may appear.

If in a multi-storey building with a single riser, residents of the apartments on the first floor installed a 50 or 110 millimeter check valve for the sewer, then flooding with drains can occur even on the 2nd floor. The liquid will not get further up, because. pressure will most likely cause the blockage to clear.

In country houses, similar locking mechanisms are also quite often installed. However, then it is recommended to mount them on the street, after collecting all the branches of the sewer pipes into a single one.

Types of valves and principle of operation

There are several varieties of sewer check valves for 110 and 50 millimeters, which differ in scope. Accordingly, all types of mechanisms have a different design and principle of operation of one element.

In general, all varieties have a single mechanism for the operation of the system: in a calm state, the barrier damper is at the bottom, thus closing the lumen of the pipeline and preventing the fluid from flowing back.

When the waste liquids come up, the damper automatically rises, after which it returns to its original position again. It is according to the mechanism of operation of the damper that models of sewer check valves are classified.

Swivel

This type of sewer valves has a spring-loaded membrane (it is called a plate because of its round shape). In the case when the wastewater moves in the right direction, the plate turns and goes up without interfering with the movement of liquids.

However, with the opposite direction of the drains, the spring-loaded membrane is tightly pressed against the outer rim, as a result of which the working area of the pipeline is blocked.

Some models additionally have a built-in additional damper, which is controlled manually. A similar locking mechanism can be adjusted using a special button located on the device.

Due to the peculiarities of the design form, this type of check valve for sewerage 50/110 mm is also called petal. As a rule, the body of the device is larger than the dimensions of the pipe where it is mounted.

Thus, the pipeline has first an expanding and then a narrowing section, which is a possible place for the formation of a blockage in the sewer system. The solution to this problem is the placement of the cover mechanism at the top of the housing. Having removed it, it is possible to quickly and easily remove the blockage that has appeared.

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Lift valve for sewerage

This element can consist of 2 components, which are fixed at the central rod, or in appearance resemble a small plate, which is fixed to the body using a spring mechanism.

It is advisable to install such an option only if other varieties cannot be installed. Even taking into account the small size, it is still desirable to give preference to other types of device. A 50 mm wafer check valve is rarely installed on the sewer, because. belongs to the category of equipment for water supply. For sewer systems, its efficiency is quite low.

Another disadvantage of this design is the inability to quickly clean the device. Due to the nature of the shape, it will be necessary to completely disassemble the connection in order to clean the valve.

How to install the valve

Installation instructions for a 110 mm sewer check valve:

Find a suitable place for mounting the device, it is important to take into account the diameter of the pipeline. A product of 110, 100, 50 and 40 mm can be used, depending on the pipe section.

Before installation, it is important to manually check the tightness of the structure. If there are suspicions of problems, it is recommended to contact the store or service and replace the device under warranty.
Carefully cut the pipeline and install the valve. When performing the procedure, it is important to take into account the direction of movement of wastewater, it must match the arrow shown on the plastic case of the product.
Sealants made of silicone or rubber are certainly installed at the ends of the cut pipe. In most cases, the second option is used.
The operation of the sewer valve is checked. If the installation was carried out with violations, the wastewater will rise up.

Watch the video

When performing the procedure, it is important to follow certain recommendations in order to install a 50/110 mm sewer check valve. These include:

be sure to make sure that the arrow on the body is directed precisely in the direction of the normal movement of the fluid;
installation when using a plastic model is quite simple: the ends of the pipeline are connected to the valve socket. The formed connection, as a rule, is already tight, but you can additionally lubricate it with special silicone sealants intended for plumbing fixtures;
when mounting a cast-iron device, sealing gum and bolts are used that tighten the mounting plates. Some models on the market have sockets; their installation does not differ from the installation of plastic varieties;
when choosing a suitable location, it is important to consider the possibility of unhindered access to the removable cover. This will be required if the locking mechanism becomes clogged and it becomes necessary to clean it.

Watch the video

Materials and dimensions of products

When choosing a sewer check valve model, it is recommended to know what materials the device is made of, as well as the dimensions of the products. The most common materials:

stainless steel;
cast iron alloy;
bronze;
plastic.

In most cases, a check valve is purchased from the same material as the pipeline installed in an apartment building or a private house. It is not recommended, for example, to buy a plastic device for cast iron pipes. The most popular choice in terms of price / quality ratio is a valve made of high quality plastic.

The dimensions of the device depend on the amount of free space. There is also such a characteristic as the connection method - horizontal or vertical. In most cases, devices for horizontal connection are used, however, if there is not enough free space behind the toilet, bathtub and other plumbing fixtures, then vertical check valves are installed. If space is critically small, then it is recommended to purchase an inter-flange type of mechanism. For its installation, only seals are required.

Is it really necessary

The installation of a sewer check valve 50 or 110 is not always required, there are certain situations when the installation of this device does not make much sense. For example, residents of apartments on the 6th floor of an apartment building may not worry about possible sewer flooding through a central blockage, because. the pressure of the stock liquids will not maintain a high level when ascending to the 6th floor.

In general, there are such situations when the device is strongly recommended to be installed:

location of the apartment on the first / second floor of a multi-storey building;
the location of the office space on the first two floors;
private 1-storey house;
cottage-type country house with 2-3 floors.

In the above situations, it is financially more profitable and easier to install a valve on plumbing fixtures in advance than to repair the premises later and deal with the negative consequences of clogging and breaking through the sewer. It is especially important to carry out the installation of the mechanism in houses with an old pipeline. Pipes in such buildings usually have a layer of sediment on the inner walls, resulting in a smaller working area and increasing the likelihood of clogging.

How to choose a fixture

It is important to pay sufficient attention to the process of selecting a non-return valve model for sewerage. First of all, you need to analyze your sewer system. It is on the basis of its features that it is necessary to select a suitable valve model.

You need to focus on the following parameters:

pipe section;
material of manufacture;
device dimensions;
connection method - horizontal or vertical;
quality level, availability of a warranty period;
laborious installation.

The cost is also important, but it does not determine how the chosen mechanism will be of high quality and durable. The price depends on the material of manufacture and the functionality of the device, but you should consider your own financial capabilities.

For example, in a country house with a plastic pipeline, you should not purchase an expensive imported model that runs on an electric motor.

The most important characteristic that you need to know before purchasing a sewer check valve is the diameter of the sockets and pipes. These two parameters must match.

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It is not recommended to purchase a device with a socket of the wrong section and rely on the installation of an adapter. Its use can lead to a malfunction of the entire system, and can also provoke a decrease in the throughput of the pipeline.

The labor intensity of installation is important both for the owner of the house, if he does the installation with his own hands, and for determining the cost of work, if the installation is carried out by a plumber. As a rule, for apartments with plastic pipes, it is enough to purchase a 50 mm plastic valve; its installation is quite simple using a standard set of construction tools.

When a suitable model has been selected, it is advisable to manually check the presence of an arrow in the store (it shows the movement of the drain to prevent incorrect mounting) and the quality of the assembly. All structural elements must be tightly attached, not creak or dangle.

It is also advisable to make sure that the store has a guarantee for the goods and relevant documents. The original device certainly has a warranty receipt, as well as installation tips and instructions.

Thus, you can install the locking mechanism yourself, this does not require professional equipment, minimal tools are enough. However, the most important thing is to choose the right device, focusing on the features of the sewer system.

When carrying out installation, it is desirable to follow certain recommendations of specialists, this will allow the procedure to be carried out as quickly and efficiently as possible.

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Why do I need a 110 mm sewer check valve, and where is it used? It is installed not only in apartments, but also in private houses. After all, he solves serious problems that may arise in the bathroom.

Why is it needed

From time to time, residents of private houses and apartments located on the first floors of multi-storey buildings (especially in old ones) are faced with such a problem as the reverse flow of fluid. Yes, this happens - the toilet is filled with the contents of the sewer pipes, and in especially neglected cases, it even overflows. The reason for this is simple - a blockage in the horizontal pipes located in the basement. However, the inhabitants of such apartments are not at all easier from the fact that the problem is in such a simple malfunction. An unpleasant smell, a dirty bath and sink, and sometimes wet floors will leave few people indifferent and calm. Fortunately, this problem can be solved by installing a simple sewer check valve of a suitable diameter. True, in this case, people living on the floor above will face exactly the same troubles. However, this happens relatively infrequently - before the water rises to the second floor, the pressure in the pipes rises to such a limit that the blockage simply pushes through and leaves.

But this does not mean that the sewer check valve is useless for the inhabitants of higher floors. After all, blockage can also occur in vertical pipes between floors. Yes, this happens much less often, but it still happens. Most often, the reason for this is the ingress of foreign objects (pads, diapers, pieces of cotton wool or cardboard sleeves from toilet paper), which swell and get stuck. As a result, a whole fountain from the contents of sewer pipes may appear in the toilet bowl or sink even on the 10th floor. And only a reliable locking device will completely eliminate this possibility.

However, blockages arise not only due to the fact that what needs to be sent to the trash bag is flushed down the toilet. This happens simply because of old pipes - gradually their inner diameter decreases due to salts deposited on the walls. Therefore, the older the house, the higher the risk of blockages.

An additional purpose of the sewer check valve is to protect the premises from wild animals. Most often, rats and mice penetrate into private houses in this way, but sometimes unwanted neighbors can also be found in multi-apartment high-rise buildings. Of course, thanks to the check valve for sewage, the problem is solved once and for all.

How does he work?

The principle of operation of these uncomplicated, but useful devices is extremely simple. They are somewhat larger than the pipe on which they are installed, as they must accommodate certain components. The main one is a mechanical movable damper. When the valve is not operating, the damper is in the standard "closed" position. When the main flow passes, the water presses on the damper and easily lifts it, so that the contents of the toilet bowl or sink quickly go into the sewer. But if there is a reverse flow, then the damper will remain motionless due to its special device.

They can be divided into two groups depending on the diameter of the pipes in which they are installed - 50 and 110 (or 160) millimeters. The first are designed for installation on sewer pipes coming from sinks and bathtubs. The latter are needed to exclude the possibility of sewage entering the toilet bowl - here the pipes have a larger diameter in order to instantly pass water along with waste products.

Despite their simplicity, they can have a different device - first of all, they differ in the type of barrier, as well as the principle of its operation. If we consider the varieties of check valves for sewage 50 mm and 110 mm, it turns out that the following options are most common:

lifting,
rotary,
ball,
interflange.

It will be useful to talk about each of them in more detail, so that everyone can choose and acquire exactly the look that suits him best.

lifting

The main advantage of this model is the high reliability achieved by the most simple device. When drains come from the toilet, the locking element rises under pressure from below, passing the flow. Immediately after that, the spring returns it to its original position. If the flow comes from the opposite direction, then it presses on the element from above, which does not lead to any result - it remains in place.

The only negative that this 110 mm sewer check valve has is the possibility of blockage. It needs to be cleaned from time to time. Fortunately, this is not at all difficult to do. It is enough to unscrew the four bolts on the upper surface, then rinse the mechanism under running water, put it back in place and tighten the bolts.

Swivel

Another name for rotary sewer check valves 110 mm is flap valves. The fact is that here the constipation mechanism really resembles a petal. The pipe is blocked by a special membrane equipped with a spring. If the flow comes from the "correct" side, then the pressure raises the blade. Conversely, when moving in the opposite direction, the water will run into a membrane that it cannot lift under any conditions.

The device of the product can deliver a certain problem. It has an expansion, and then a narrowing - so that the water easily passes through, raising the membrane. However, it is in such places that blockages most often occur. Therefore, the developers placed a special removable cover on top. It is enough to remove it so that you can easily remove the blockage.

Ball

This device has a locking mechanism in the form of a ball. If you press on it from the "necessary" side, then it rises a little and rolls into a specially designated recess, without interfering with the flow into the sewer pipe. Immediately after the flow dries up, the ball returns to its place under its weight. When the flow comes from the opposite side, it presses on the ball from above and it maintains its position without moving even a millimeter.

The only drawback of this solution is that the ball does not always fit perfectly with the side walls. Therefore, a small part of the waste water can leak out. However, its volume will be insignificant, in most cases it goes unnoticed - there is neither a fountain from the toilet bowl, nor an unpleasant smell from the sink.

Wafer

If you are looking for a non-return valve for sewage 50 mm, and not 110, then it is the wafer type that will be the best choice. It has the smallest dimensions of all existing ones. The device is also very simple and resembles a reed valve. Outwardly, it resembles a low cylinder, in which there is a rotary damper. The damper can be of two types. Firstly, two semicircles fixed on the central rod and fixed by springs. Secondly, a small plate mounted on the housing wall and also held by a spring. Under pressure, the locking element rises and passes water into the sewer. However, their small size means that they cannot pass through any solid objects - only water. In addition, they are not installed on top of the pipe, but inside. Therefore, for simple cleaning, you will have to completely disassemble the pipes, and doing such work is not very pleasant. All this makes its 50mm wafer check valve completely unsuitable for a toilet bowl and an excellent choice for draining dirty water from a bathtub or sink.

How to choose the right option?

For starters, the 110mm or 50mm check valve can be made from a variety of materials:

polypropylene,
PVC,
stainless steel,
ABS plastic.

The model material should be chosen based on what the pipes are made of. That is, for metal pipes, it is better to take a metal device, while PVC pipes work better with plastic products.

It is also very important to ensure that the diameter matches. There should not be any narrowing here - they will lead to the speedy appearance of blockages and, accordingly, you will have to perform such unpleasant work as cleaning very often.

In addition, you need to decide where exactly you will install the device. Some people prefer to install 50mm drain check valves on all sinks and bathtub, and 160mm on the toilet (if they are far apart), while others are able to install just one check valve on a common sewer pipe (if the bathtub , kitchen and bathroom are located compactly).

What you need to know when installing

In most cases, the installation process does not cause serious problems for an experienced master. However, check valves cannot be called particularly common and well-known products. Therefore, it will be very useful to give a few simple tips that can help you do all the work correctly:

Notice the arrow. There must be an arrow on the body showing the "correct" direction of flow. If you install the product incorrectly, then water from the toilet and sink will accumulate in the pipes, while drains from the sewer will easily enter the apartment;
Be sure to perform a preliminary check so as not to get problems in the future. To do this, simply open the cold water in the bathroom and let the jet into the check valve, first on one side, and then on the other;
If after some time after installation you hear an unfamiliar noise and vibration, then most likely it is a blocking membrane. It is clogged or damaged. Clean it - if that doesn't help, then replace the sealed bezel from the damper - in most cases it can be easily removed.

By remembering these simple rules, you will surely be able to easily cope with the installation of the system and will not encounter any difficulties.

Why do clients choose us?

Are you thinking about buying a quality check valve 110 mm, plastic pipes or some accessories for a plumbing or sewerage system? NordStar offers its customers a wide range of diverse products. Thousands of residents of St. Petersburg applied to our company and subsequently had no reason to regret their choice. Many of them even moved into the category of regular customers, which allowed them to receive special conditions for cooperation.

They highly value high quality and affordable prices,
which we are glad to offer them. Collaborating with trusted suppliers and purchasing
all products in large quantities, the company can significantly reduce the cost
parts without sacrificing quality. Well, excellent service is another reason for
in order to contact us. Experienced consultants will answer any questions you may have.
you questions, and if necessary, they will help you choose the right one for a particular
equipment situation.

A non-return valve for sewers with a diameter of 110 mm and 50 mm (the most common in apartments and private houses) is able to save the owners of a house or apartment from a lot of trouble associated with blockages and reverse flow of drains. Not expensive and not difficult to install, the device will protect property and prevent unnecessary waste of funds.

The occurrence of sewer backflow can be caused by various reasons, including:

Misuse sewer system, as a result of which rags, plastic bags and other things block the pipe clearance.
Appearance during long-term operation sediment on the inner walls of pipes. In this case, not only the clearance decreases, but also a roughness appears on the walls, which contributes to the settling of solid particles and even faster plug formation.
Incorrect slope of the sewer pipeline. Moreover, both too large and too small a slope contributes to blockages. In order for solid particles not to settle on the inner walls, the water flow that moves them must move at a certain speed. You can change the slope only by completely redoing the system.
The presence of bends located at right angles, causes the flow of water to change its speed dramatically, while large inclusions can be delayed, forming a plug over time.

Types of check valves

A non-return valve for sewers is a device that allows water to flow in only one direction and prevents reverse flow. Such devices can be installed at pipe joints, in flanges, or cut into the pipeline using threaded connections.

An element blocking the flow of water can be, for example, "plate", fixed inside the housing in such a way that under the pressure of the flow in the right direction it opens easily, and with reverse current it only presses more tightly against the support ring.

Check valve for sewerage - photo of a plastic model

Also common are ball models, operating on a similar principle, but having a ball inside instead of a plate and characterized by greater reliability, ease of maintenance (to maintain efficiency, the device must be periodically cleaned) and maintainability.

The choice between coupling and flange models is made subject to certain rules:

Flanged Models are suitable for both vertical and horizontal sections of the sewer pipeline, and coupling - only for vertical ones.
Union valves are optimal for pipes 2.5 inches or less, and flanged ones are suitable for communications with a diameter of 40 to 600 mm. Thus, the most common sizes - a check valve for sewage 50 mm and 110 mm can be in different designs.

Principle of operation and device

Any sewer check valve, vertical or horizontal, blocks the flow of water in the opposite direction. The check valve for pressure sewage has inlet and outlet pipes of different diameters with a chamber between them. Due to the difference in cross-sectional area, different pressures are created in the nozzles, and the ball in the chamber freely passes water. During the reverse stroke, the pressure in the nozzles changes, and the ball presses the membrane blocking the lumen, completely eliminating the ingress of water from the outlet into the inlet.

In other models, the shut-off "plate" in the presence of pressure rises and passes wastewater, and then immediately assumes a vertical position, thereby preventing the possible passage of wastewater in the opposite direction.

Such devices have a cover fixed with bolts and supplemented with a seal. It is quite easy to open it if necessary to clean the device. Often the check valve in the sewer system is equipped with a shut-off valve.

A plate instead of a ball as a blocking device can be used in large diameter models, such as, for example, a 110 mm sewer check valve, although this condition is not mandatory.

Materials and dimensions of products

The dimensions (mounting diameter) of the check valve for sewage in an apartment depend on the section of the pipeline for which it is intended:

for toilets choose check valves DN110 mm,
for the main pipelines of internal systems DN50 mm,
for external sewage systems - Du150-Du200 mm and more if necessary.

32 mm and 40 mm products are also used.

For the manufacture of non-return sewer valves, the same materials are used as for the production of pipes:

plastic,
steel,
cast iron.

Plastic models are often installed in internal systems from appropriate pipes with a small diameter.

Cast iron pipes and, accordingly, cast iron check valves are recommended for powerful (mainly external) pipelines with a large cross-sectional area, experiencing heavy loads.

Installation of sewer check valves

Do-it-yourself installation of a check valve on a sewer can be done in various ways.

Models with high capacity can be used for installation on a common sewer pipe. Such options are suitable for private houses, summer cottages and cottages, but not for an apartment in a high-rise building.
Installing a valve at each drain point in the apartment will prevent an emergency and is especially recommended for residents of the lower (first and second) floors of multi-storey buildings, which are most at risk of flooding when the sewer system is clogged.
On sewer lines with a reverse slope - without fail to ensure the normal functioning of the system.

Installation Features

It is best to take care of installing a sewer check valve at the stage. Regardless of the type of device (flanged or coupling), the valve will have to be inserted into the finished system, turning off, draining and disassembling the sewer line. It should also be taken into account that the coupling valve has its own length, therefore, when reassembling the line, it will be necessary to adjust the size of the pipes.

It is optimal if the diameter of the valve exactly matches the diameter of the pipeline. Otherwise, you will have to use adapters, which unnecessarily complicates the design (the more joining elements, the less reliable the communications section).
Adapters will also be required if the material of the pipes differs from the material of the check valve, however, it is best to initially select a model that is suitable in all respects without complicating your task.
A preliminary check of the operability (tightness) of the valve can only be carried out visually. Install the product only if it has no visible defects.

Before you install a check valve on the sewer, you need to know the basic rules that must be observed during installation:

When choosing a place to install a check valve on an internal or external sewer line, consider the need for easy access to the device for inspection, cleaning and repair.
The orienting arrow, which is provided with each sewer ball check valve, shows the correct direction of water flow, and therefore should point to the sewer collector. The valve, set the other way around, will not interfere with the drain, but will not perform protective functions.
All connections must be sealed during installation (for example, with FUM tape).

The appearance of noise and vibration of the check valve indicates a violation of its tightness. To restore the device's performance, there is no need to dismantle the system, it is enough to change the shutter or gasket by opening the valve cover.

If we talk about the cost, then for a 110 mm sewer check valve, the price will be about 2,600 rubles (PVC product), and a 50 mm check valve made of the same material will cost approximately 1,150 rubles. These valves also have the ability to forcibly close the drain and use them outdoors.

Do not confuse the check valve and . These are completely different types of equipment.

There are situations when a sewer pump is needed in the kitchen. More about this we.

Non-return valve for sewage photo

Here you can see some photos related to the topic of our article.

Check valve PVC 110

Unfortunately, in sewer communications, emergencies often occur due to clogged pipes. The reasons may be incorrect installation, violations during the operation of the system and the ingress of foreign objects into it.

And if the pipe is clogged on the lower floor of an apartment building, then the sewage, together with fecal matter from the neighbors in the riser, will gradually reach the level of the toilet bowl and flood the apartment. Moreover, unpleasant odors will be a trifle compared to the cost of repairs and the purchase of new things. To avoid such an unpleasant situation, you can use a non-return valve for sewers with a diameter of 110 millimeters.

Design and principle of operation of the device

This part is part of the shut-off valves and consists of the following elements:

Housing made of metal or plastic, which matches the diameter of the sewer pipe (in the toilet, the outlet pipe has a diameter of 110 mm).
A disc with a rubber seal located inside the structure.
A metal spring that controls the movement of the disc.
Mechanism for forced opening of the device.

Recently, due to the widespread use of plastic communications, a PVC check valve has been used for sewerage. Its connection has exactly the same appearance as PVC pipes.

The principle of operation of the device is quite simple. When water is drained from a toilet bowl or other device, under the action of water pressure, the disk opens and passes the drains into the sewer. Then a powerful spring returns the locking mechanism into place.

Important! The valve works only in one direction, so that in the event of a blockage in the sewer pipe, sewage does not enter the room, as well as unpleasant odors.

There are devices that differ in design and have different sizes - these are mechanisms to prevent the reverse flow of fluid through the pipeline. They have two nozzles for starting and discharging fluid. The operation of the device is controlled by a ball with air. And if the liquid starts moving in the opposite direction, then the ball will block the pipe and will not let the water back.

The reverse locking mechanism can be installed on a common outlet sewer pipe or on each plumbing fixture. The dimensions of the check valve depend on the diameter of the sewer pipe.

Check valve installation

It is possible to mount a locking device during the construction of a new pipeline, which is more convenient, or during the operation of an existing communication. In this case, it is necessary to break the pipe and install a valve of the required size. And if there is no device of a suitable size, then you should insert a part of a different diameter with the appropriate adapters.

Locking device installation procedure

The sequence of actions during installation is as follows:

The valve for internal sewage on the body is marked in the form of an arrow, which indicates the direction of fluid flow. For example, when mounting this element in a toilet bowl, the label should point to the collector. If installed incorrectly, the device will not work.
All pipe connections must be sealed.
After installing the locking mechanism in place, it is necessary to check the performance of all devices in the complex. To do this, briefly supply water under pressure to the plumbing fixture and carefully inspect the body and joints.

If extraneous noises and sounds occur in the valve during operation, this will mean that the tightness of the connections is broken, or damage has appeared on the gasket of the locking disc. In this case, it is necessary to turn off the water, disassemble the device case and fix the problem. After that, you can turn on the water again and use the plumbing fixtures for their intended purpose.

Types of check valves

Valve types

Locking devices have different sizes, which depend on the diameter of the pipes used. There are also design features of products.

So, for example, for external sewage, those that are controlled not mechanically - by a spring, but by means of a heavy metal damper located in a certain way on a steel axis can be used.

A similar design is installed on most valves of the Du 200 brand, the diameter of which is indicated by this figure. This product is rotary and is established on communications of big diameter.

On smaller pipelines, check valves of the DN 50 type are used to prevent the backflow of water, that is, for pipes with a diameter of 50 mm. They are used in heating systems, water supply and in the operation of pumping stations.

Conclusion

The non-return valve is in the sewer system a reliable protection against the penetration of unpleasant odors, sewage and waste into the room in the event of an emergency. To ensure that malfunctions in the sewer do not violate the level of comfort, the installation of this device is a prerequisite.