Shut-off valves for sewerage - this is required element for the normal functioning of the system. Its main purpose is to prevent the formation of backflow in case of blockage and relieve excess pressure, as well as to completely stop the movement of the medium.
Sewage systems involve the discharge of liquid and solid waste, as well as aggressive substances, so the shut-off valve sewer fittings must have the following characteristics:
- high throughput;
- chemical inertness;
- durability;
- ability to withstand a given pressure.
In domestic systems, most often the products are installed on sewer pipes apartment by apartment or on a riser. For residents of the first floors and houses with old communications, installation on each source of wastewater is recommended. The most common type of shut-off valve for sewer pipes– check valve.
Industrial enterprises must be provided not only with backflow protection, but also with the ability to completely stop the flow of the medium. These include rubber wedge gate valves, knife/gate valves, butterfly valves, valves and filters.
Classification of fittings for sewerage
Depending on the purpose of use, sewer shut-off valves are divided into:
- shut-off valve Products of this class allow you to hermetically seal the pipeline and are designed for regular use, which is a prerequisite for some production processes;
- shut-off and safety. Provides protection against changes in the direction of movement of the medium and pressure surges.
By connection type:
- coupling Attached to the pipeline via thread;
- flanged Attached to the pipeline using end flanges.
In terms of work autonomy:
- controlled. It is activated either manually or by automation systems located outside the environment;
- autonomous. It is activated by the environment itself and does not require additional interventions.
By control method:
- manual. Valves, valves and taps are rotated directly by personnel;
- mechanical. Triggering occurs due to a drive using an external energy source;
- with remote control. It works due to a drive mechanism, which makes it possible to control the valves from a distance.
Shut-off valves for sewerage from POLIPLASTIK
Shut-off valves for sewerage offered by the POLIPLASTIC group of companies are distinguished by high quality manufacturing and reliability. We produce products intended for industrial drainage and sewerage systems, as well as fittings for installation in domestic sewer lines.
In our assortment:
- Valves with a rubber wedge are relatively simple and reliable devices that block the movement of a medium by displacing the wedge inside the valve body. Can be used in drive controlled systems;
- knife valves that allow you to completely shut off and also regulate the flow. The locking element is a disk, the position of which is controlled by a rod nut. This universal and popular design is used as a shut-off valve for sewer pipes in enterprises with a large amount of solid waste, as well as in places where aggressive substances can be discharged. Due to the fact that the threaded unit does not come into contact with the transported medium, the mechanism is stable and designed for regular use. The short length of the valve allows it to be installed in the most convenient places for access;
- butterfly valves with discs resistant to aggressive environments. The main advantages are compactness, low torque and high throughput. Mounted on technical drainage pipelines. Such shut-off sewer valves can be used for wastewater with a small amount of solids;
- check valves are a type of shut-off valve used in everyday life and in production. They allow the medium to move only in a given direction, and if reverse flow the flow is blocked by a movable membrane.
All products can be used in pipelines made of polymeric materials and are available in a coupling or flanged housing design.
The main requirement for sewer shut-off valves is resistance to aggressive environments. It is used in both private and industrial drainage. In this case, the type and material of sewer shut-off valves are determined from the area of application and the diameter of the pipes.
Depending on the purpose, gate valves, shutters, and valves can be used. Each type of fittings has its own characteristics and technical parameters. The full range of shut-off valves includes:
- Check valves. They provide protection against overflows and prevent backflow of the medium. Check valves can be lifting (the locking mechanism is located horizontally) and rotating (the seat is located across the flow of the medium).
- Wedge valves. Made of steel and used to completely or partially block the flow of the medium. By type of wedge there are hard, double-disc and elastic.
- Butterfly valves. Allows you to shut off the flow of the medium in less time. The maximum degree of insulation is achieved through the use of rubber seals.
When choosing shut-off valves for sewerage, the diameter of the pipe, the composition of the medium, pressure and other characteristics are taken into account.
Buy shut-off valves for sewerage at Gidrokom
From us you can buy shut-off valves for sewerage from the German manufacturer KSB. The catalog includes valves, valves, gate valves, presented by application area, that is, shut-off and control valves for sewerage and wastewater, and design features. Do right choice Consultation with our specialists will help you with shut-off valves for sewerage. Just contact us by phone or fill out the feedback form on the website. The price of shut-off valves for sewerage is provided upon request.
A sewer return valve or valve is a shut-off and control valve. It is intended to automatically block the counterflow in wastewater disposal systems in order to improve the sanitary condition of a residential property.
What is a check valve
Check valve for sewerage - a device that allows the working fluid to move exclusively in one direction. This product is widely used in the construction of water and heat supply systems.
The use of a return element for drains requires compliance with certain conditions:
- It is necessary that the valve opens and closes even with minimal pressure. The fact is that most household sewage systems are of the gravity type.
- Since the valve and seat always become overgrown with grease and various deposits over time, the sewer valve should be easy to open when cleaning is necessary.
Valves that require significant excess pressure to open, such as ball valves, can be used in pressure systems ah sewer. They are placed at the beginning of the pressure section behind the pumping equipment in order to prevent the reverse movement of wastewater after stopping its operation.
This type of shut-off valve for sewerage is made of plastics, most often polypropylene and unplasticized polyvinyl chloride (abbreviated UPVC). In order to distinguish products according to the place of application, different colors are used - for outdoor installation it is orange, and for internal sewerage- grey.
They are made:
- single-chamber valves equipped with one damper;
- two-chamber devices with two dampers.
The second type of wastewater check valve is more reliable. When a dirty seat on one of the dampers prevents it from closing completely, then the second one ensures tightness. A check valve is often sold under the name sewer valve.
Many valves are provided with manual control, when the damper is forced to the fully closed position. Manufacturers, in addition to mechanical devices, also produce electrified products. In them, the servomotor, which blocks the path of waste water with a damper, starts after the filling sensor is triggered.
Electrified stop valve for sewerage, they are often equipped with a battery that provides long-term (up to 7 days) operation in the event of a lack of electricity.
Purpose of the valve in the sewer system
Why is a non-return valve needed for a sewer? It is necessary so that in the event of a blockage, drains from the upper floors cannot enter the rooms below.
In this case, the principle of communicating vessels applies. Its essence is that if the outlet to the well or collector fails to fulfill its function, the waste liquid is poured through a device located lower than other plumbing fixtures. But if there is a valve in front of it, sewage will begin to look for another route.
The valve flaps simultaneously prevent the reverse movement of wastewater and prevent the movement of mice and rats through the sewer system. In the absence of waste liquid, the valve flap on the sewer pipe is in the fully closed position, and in the case of draining water, it is raised enough to allow the moving flow to pass.
Check valve type
This is considered the most common type of check valve. Why do you need a sewer check valve? It makes it impossible for waste fluid to move in the opposite direction. Its device is simple: the shutter element in it is a metal ball. If back pressure it is pressed by a spring.
The location in which this element is mounted depends on its design features. For example, a coupling product is used for vertical pipelines, and flanged - on horizontal and vertical objects.
The coupling valve is mounted on pipes with a maximum diameter of 2.5 inches, and for pipe cross-sections from 40 to 600 millimeters, a flanged valve is used. A non-return ball valve for sewerage is capable of blocking the movement of return drains by one hundred percent with absolute straight passage. Such a system cannot be jammed.
Another advantage of the ball valve is its excellent maintainability. If there is a need to change the ball or clean it, the valve can be easily disassembled. To do this, remove 2 or 4 bolts from the product cover.
Check valve for pressure sewer systems
Installed in pressure sewer network the check valve prevents the waste flow from changing direction. This pipeline safety valve allows fluid to flow in one direction and stops it from flowing in the opposite direction.
The check valve for pressure sewerage operates in automatic mode; the product belongs to direct-acting fittings. It is an uninterrupted universal device because it works both in normal mode and in emergency situations.
If a household has several pumping units and their pressure lines are combined into one system, then one or more valves are installed on all of them. Each of them protects engineering communications from operating pressure pumping equipment on any branch.
Thanks to this, if the pressure decreases on one of the lines, then on the others it remains the same and an emergency does not occur. If the waste liquid does not move through the shut-off valve, then the valve operates as follows: the spool, under the influence of its own weight, ensures the movement of water through the seat of the product.
In order for the drains to change direction, they must be stopped. When the flow does not move, pressure from the opposite side presses the spool, preventing the formation of waste water backflow.
Correct installation location
The check valve will perform its function if positioned correctly. Usually this device placed at the outlet into the well of the sewer main of the basement or basement floor.
These rooms should be equipped with a separate outlet. Alternatively, the outlets can be combined after the valve. In the event of a backup of the street sewer, the edges of the plumbing equipment will be lower than the well, but due to the presence of the valve, the room will not be flooded.
In accordance with SNiP 2.04.01-85, electrified valves should be installed at the outlet of the sewerage system on the basement and ground floors, which, when activated, must send a signal to the control panel. An exception is only permissible for premises operated around the clock - manually controlled models can be used in them.
In apartments located on the first floors apartment buildings, valves are placed after any plumbing fixtures. For example, a 110 mm PVC check valve can be placed after the toilet, and 50 mm products can be placed on the outlets for connecting a sink, washbasin or shower.
There is another solution, a simpler one, which involves installing a common 110-millimeter shutter at the entrance to a separate apartment, directly after the cross or tee.
In a private household that is connected to a centralized sewer main, the valve can be placed with inside foundation of the building before release to the well. Before you install a check valve on the sewer, you need to be sure that the location will allow it to be conveniently serviced. To do this, once every 3-6 months the hatch must be opened to clean the seat and damper from various deposits.
Incorrect location of shut-off valves
Professionals strongly do not recommend installing vertical
a non-return valve for sewerage, as well as all kinds of traps, and other devices for garbage in the gap of the risers of the sewage disposal system. This is explained by the fact that the damper, even when in the fully open position, is an obstacle for them, an unevenness present inside the pipe.
Therefore, shut-off valves for sewerage certainly collect large-sized inclusions moving along the riser, for example, rags that fall into the toilet. Their presence in the sewer system is considered a gross violation of its operating conditions, but, unfortunately, this happens quite often.
As a result, the valve often begins to cause blockages in the riser with the occurrence of backwater at the floor level, which leads to:
- to flooding of the apartment, but not through the plumbing, but from above through interfloor covering;
- to the breakdown of the valve flap in the event of clearing another blockage, because the sewer cable is a durable tool, the use of which requires considerable effort;
- to draw up an act on unauthorized interference in the configuration of public utilities, issuing an invoice for work on restoring the riser. You may have to pay for repairs from neighbors living above.
Check valve installation process
There is a specific procedure for installing a check valve. A simple case is the installation of a cuff valve on plumbing fixtures.
It consists of the following stages:
- A cuff is placed over the toilet outlet.
- The outlet with the cuff is placed in the socket of the sewer pipe.
- The toilet is fixed with standard fasteners.
In this case, you need to take into account several nuances:
- the toilet must be connected to a pipe that has a straight section after the socket, and the valve should not rest against the wall of the outlet;
- When assembling connections, you should not use sealant and mount the device on mastic or cement, since the valve will need to be cleaned.
A check valve for a toilet with socket connections is installed in the same way as any plastic fitting. In this case, a smooth piece with a chamfer removed is placed in a socket equipped with a rubber ring seal. To simplify the assembly process, apply liquid soap or a water-based lubricant.
If you need to install a valve in a gap in a previously assembled sewer section, you must purchase shaped element, which is called a compensating pipe - a short tube with an elongated socket.
The installation sequence will be as follows:
- The pipe is cut above the socket in two places.
- The cut area is removed.
- The pipe piece is removed from the socket.
- The compensator is placed all the way onto the pipe above the socket.
- A check valve is inserted into the socket.
- The compensator is seated into the valve socket.
There are also some nuances in this case:
- On cut sections of the pipe, you need to clean the burrs from the inside and remove the outer chamfer. If this is not done, when the sewer is running, uneven surfaces will begin to trap debris. In turn, the chamfer will help to easily join the socket joint.
- After assembly, the valve socket should be secured with a separate clamp to prevent spontaneous uncoupling in the event of sewer backup, since the compensator may move up the pipe.
To mount the valve in the absence of a socket, in addition to the compensator, you will need a sewer coupling. It is placed on a pipe cut to size, below the location of the valve. The remaining steps are similar to those described above.
Description of valve samples
To find out not only how a sewer check valve works, but also what type it is, some models of TM Hutterer & Lechner products, which are considered the highest quality on the domestic market, will be described below:
- Shutter for washing machine HL3. Designed to prevent waste from entering the device without its own valve. It is made of polypropylene, has a diameter of 3/4 inches, and the operating mode is 95 degrees. Connections – union nut plus gasket, hose fitting.
- 50mm HL4 valve. Works with waste liquids without feces and large suspensions. It is placed vertically or horizontally. This check valve on a polypropylene sink or bathtub is installed in front of the plumbing. The throughput is 1.36 liters per second. Connections - smooth pipe, socket with a seal in the form of a ring with a diameter of 50 millimeters.
- 110 mm valve HL 710.0. It is mounted horizontally, on the edge of the well outlet. The operating temperature is 60 degrees. Made from impact-resistant ABS plastic. The connection is a socket with a seal-ring with a diameter of 110 millimeters.
When installing sewer systems in buildings and structures, we use different kinds fittings. One of the main varieties is sewer valves. They perform an auxiliary function, providing the possibility of more comfortable use of sewerage without undesirable consequences.
Depending on the purpose, there are check valves and air sewer valves. Our catalog presents both types of these devices, which are offered at competitive prices.
Sewage check valves
Sewage check valves are direct-acting safety valves. Devices of this type are designed to protect plumbing fixtures from flooding with sewage. This type of flooding can occur for a variety of reasons.
Including possible clogging of sewer pipes as a result of violation of the rules of their operation by users, a reduction in the internal cross-section of sewer pipes as a result of their overgrowing during long-term operation.
Flooding is possible as a result of errors in the design and installation of the sewer pipeline. Flooding can also be caused by objective reasons, for example, subsidence of the foundation in a private house or disruption of the normal functioning of the external sewer system during the spring flood.
Regardless of the cause, flooded plumbing fixtures can cause serious property losses. Therefore, it is recommended to use protective devices that block the return flow of wastewater. The non-return valve crashes into the sewer pipeline. Its body houses a shut-off device that allows flow to flow in only one direction. In the event of reverse flow of wastewater, the valve closes and prevents flooding.
Depending on the design, sewer check valves are divided into:
- flanged valves;
- Wafer valves;
- ball valves;
- flapper valves;
- disc valves.
Installing a check valve is an effective solution to protect property from sewage flooding. If the valve is triggered, the sewer pipes are cleaned or the necessary repair work is carried out, after which normal operation of the sewer system is restored.
Air sewer valves
Air, or ventilation, valves are designed to allow air into the sewer system and prevent the release of unpleasant odors. Every time water is drained into the sewer system, a vacuum occurs in the riser. This can cause the water seals of plumbing fixtures to break out, which will lead to the penetration of unpleasant odors into the premises.
Traditionally, to prevent such phenomena, a vent pipe is used, which is installed on the roof of the building and allows ventilation of the riser. However, when using it, unpleasant odors may enter open windows. Also, in winter, icing of the upper section of the pipe may occur, which reduces its clearance and significantly impairs the ventilation of the riser.
An effective alternative is the air drain valve, which, depending on the type locking device, can be membrane or rod. In its normal position, the valve remains closed and reliably locks sewer gases inside the riser. When a vacuum occurs when draining water, the valve opens and allows air into the riser, thereby eliminating the vacuum and ensuring normal operation of the sewer system.
Sewage valves from Santekhkomplekt
The Santekhkomplekt company in Moscow supplies sewer valves of any type. We offer a wide selection of devices with different characteristics to complete sewerage systems of any capacity. The catalog presents only high-quality equipment designed for efficient and durable operation. We offer competitive prices on our entire range of sewer valves.
Gate valve design:
Gate valve- type designed to cover a non-aggressive working environment, mainly with high temperatures and pressures.
Locking element in valves it moves perpendicular to the axis of the flow of the working medium.
Blocking the flow occurs due to the translational-rotational movement of the spindle, which moves the wedge from the upper position to the lower.
Unlike taps and gates, which open when the spindle is turned 90°, gate valves are multi-turn fittings. Smooth gradual blocking of the flow ensures the absence of sudden pressure changes, and smooth opening prevents the occurrence of water hammer. It is because of these properties that valves are used primarily in main technological and transport pipelines with diameters from 15 to 2000 mm.
Based on the design of the shut-off element, valves can be divided into wedge and gate valves.
IN wedge valves the seats in the body are located at a slight angle to each other, and the shutter is a device in the form of a wedge - rigid, elastic or double-disk, which in the “closed” position fits tightly into the space between the seats. Over time, the tightness of such a valve may be compromised due to strong friction in the extreme closed position.
Gate valves with rubber wedge are a modification of wedge valves. They have a smooth full passage, so that when the work flow is blocked, there is no strong friction. The rubberized wedge of the valve is designed to ensure high levels of tightness and strength, as well as uninterrupted operation of the shut-off valves, even with sudden changes temperature regime. Another feature characteristic of valves of this type is low control torques.
Gate valves are a type of parallel valve. are used in cases where a one-way direction of the flow of the working medium is allowed and high tightness of the shut-off valve is not required. They are intended for installation as shut-off devices on pipelines transporting sewage, sludge and other media contaminated with mechanical impurities. Sometimes the valve is made with a knife type to destroy particles in the working environment; in this case, the valves are called knife gate valves.
The location of the running unit is of great importance for the operation and scope of application of the valves. It can be located inside the valve in the operating environment or outside the body cavity. In other words, there are valves with a rising stem and a non-rising stem.
Rising stem valves:
In valves with retractable stem The spindle thread and the running nut are located outside the valve body. The lower end of the spindle is connected to the shutter and when the running nut is rotated to open the valve, it makes only translational movement together with the shutter, while the upper end of the spindle extends by the amount of stroke of the shutter. To allow movement of the spindle, the running nut is raised above the top of the cover (that is, above the stuffing box) by approximately the amount of stroke of the shutter in a design called a yoke assembly.
The advantages of this design are the absence of harmful effects of the working environment on the running gear and free access for it Maintenance, and therefore less wear of the stuffing box and higher reliability of the threaded pair and the stuffing box.
The disadvantage of such valves is the increase in construction height and weight due to the spindle coming out of the cover by no less than the diameter of the passage, and for this reason, during installation, it is necessary to leave free space for the spindle to come out.
Non-rising stem valves:
In valves with non-retractable stem the running thread is located inside the valve cavity and when opened, the spindle does not move out of the cover, maintaining its original height position. The running nut in these valves is connected to the shutter and, when the spindle rotates to open the passage, it seems to be screwed onto it, dragging the shutter along with it.
In valves with a non-retractable spindle, the running assembly is immersed in the working environment and is therefore susceptible to corrosion and abrasive particles in the working environment, access to it is closed and there is no possibility of maintenance during operation, which leads to a decrease in the reliability of the running and stuffing box units.
In this regard, such valves have limited use - for pipelines transporting mineral oils, oil, water, which are not clogged with solid impurities and do not have corrosive properties. Since valves with a non-rising spindle make it difficult to observe and maintain the running gear, they are not recommended for critical facilities.
The advantage of this design is the lower construction height, which makes it advisable to use them for underground communications, wells, oil wells, etc.
Main advantages of valves:
- comparative simplicity of design, low hydraulic resistance;
- relatively short construction length;
- the symmetry of the valve allows the working flow to pass in any direction;
- possibility of use in various operating conditions, high tightness;
- well-free installation, long service life under adverse conditions;
- the ability to repair and replace components when they break or wear out;
- low torque when controlling an electric drive;
Areas of application for valves:
Gate valves are mainly used in main pipelines, in systems of housing and communal services, gas and water supply, oil pipelines, energy facilities and many others, to shut off working environments with high temperature and pressure.
The Masterprom company sells, classifying them by area of application: , paper and pulp industry, pipelines for petroleum products, abrasives, industrial liquids. Manufacturers of valves Jafar, Stafsjo, Hawle, Orbinox, MZTA, Granard have been on the pipeline valves market for quite a long time, product quality and delivery times are justified by reasonable prices, all products are certified and comply with international standards.
Automation of valves, additional equipment:
Using its own production capabilities and developments, the Masterprom company offers its services for automation of pipeline fittings- installation of electric drive equipment of imported and Russian production. To connect the electric drive and manually operated valves, special ones are used for valves with a rubberized wedge, and for gate valves with a sliding stem.
It's also possible rod extension valves in cases where installing an electric drive directly on the valve is impossible, for example, due to a narrow well. A series of rod extensions ШФВ () allows you to install the drive at a height of up to 3500 mm, a series of rod extensions ШТН () allows you to adjust the mounting point of the electric drive within 500 mm with a maximum height of 3500 mm.
To automate a well-free valve, the Masterprom company has developed a special one that allows you to install an electric drive at a height of 500 - 800 mm above the ground.
