Garden drain valve. Everything you need to know about plumbing valves. Recommendations for the selection and installation of a safety valve

Drain valve for draining water is an important element of any fluid circulation system. On the website of the AQUIC online store you will find this necessary part in stock!

Drain valve: varieties

There are several types of valves that are installed in water supply systems and filters. The most famous of them are:

• back;
• balancing;
• shut-off;
• safety.

Each of the models has its own design and functional features.

• Check valve drain does not allow the liquid to move in the opposite direction. It is installed to maintain pressure in the system and avoid leaks.
• Balancing valve with drain helps to maintain the hydraulic regime. Also, using such a device, you can determine the flow of water for a certain period of time.
• Shut-off valve ideal for heating systems. It is not only involved in regulating the flow of water in radiators, but is also equipped with equipment for draining or filling batteries.
• Drain-safety valve makes it possible to relieve excess pressure in order to avoid overloading the system. It is actively used in the installation of heating.
• Worth mentioning separately filter drain valve . It is installed in water purification systems and therefore is made from the safest and highest quality materials.

Buying a drain valve in the AQUIC online store is profitable!

AKVIK offers to purchase drain valves different types at competitive prices. On sale there are models of the most popular diameters from reliable manufacturers:

• DMfit.
• BIORAY.
• Stormtech.
• Aquic.
• c.c.k.

All parts are made of polypropylene, durable and safe for the human body. In this regard, they can be installed in filters and drinking water circulation systems. Mounting is done by simple soldering.

Buy quality parts in AQUIC, the price of which will be much lower than in other stores! It doesn't matter if you need drain check valve or any other type, there is sure to be a suitable option in the catalog.

In any design of water supply systems, gas supply and other systems that work with different liquids, either at home or at enterprises and factories, the necessary devices and parts are selected for a specific area and in achieving the necessary goals and indicators. Of course, you can list such devices for a long time. But specifically we want to highlight such devices as electromagnetic (solenoid) valves.

What are solenoid valves

Solenoid valves are simple devices that are used to regulate the smooth operation of fluid flows in specific systems (pipelines, irrigation systems, gas supply systems, refineries, etc.). They perform a locking function.

What types are there and where are they used?

When choosing such valves, it is very important to consider the environment where they are used. Therefore, there are several types of such devices.

For example, the so-called is used to work with plumbing. It perfectly serves to protect the hoses and pipes of the irrigation system. Such a device is widely and effectively used when laying a separate water supply for irrigation. If the pipe is laid at a high level and there is a risk of freezing, then the drain valves themselves will discharge the remaining water from the system. There are widely used. In this case, the valve response time is set on the timer, which is very convenient, since this fully automates the operation of the device. That is, it is possible to program the operation of the valve according to a set time, during which water will be stored or drained at the right time and the valves will be able to operate regardless of pressure.

Where to buy drain solenoid valves?

In our online store you can find different types drain solenoid valve and drain solenoid valve with a timer from well-known domestic and foreign manufacturers (Russia, Spain, Portugal and not only). The product has a quality certificate and has passed a series of tests. The prices of goods will undoubtedly pleasantly surprise you! On the website of the store, you can get acquainted with the offered products in more detail and immediately place an order by contacting qualified employees of the company online. That is, all you need is to use a computer and in a matter of minutes you will purchase a product. Phone orders are also accepted around the clock. Prompt delivery to all regions of Russia.

Union of Soviet

Socialist

Republics

State Committee

“On matters of inventions and discoveries (53) UDC 621.646 (088.8) O 2) Inventors

V. P. Zhukov and B. I. Shcherbinkin

4 (71) Applicant (54) SHUT-OFF AND DRAIN VALVE

The invention relates to valve building and can be used in hydraulic and pneumatic systems for shutting off and relieving pressure in gas and hydraulic communications.

Shut-off and drain valves are known, including a body, inlet and outlet pipes, main and drainage seats, and an axially movable shut-off valve. with main and drain sealing surfaces and fork lead screw $1) .

A disadvantage of the known shut-off and drain valves is the presence of leakage of the working medium between the inlet and drain pipes at the moment the valve is actuated.

The purpose of the invention is to exclude leakage of the working medium between the inlet and drain pipes.

This goal is achieved by the fact that the shut-off body consists of two gates, spring-loaded relative to each other, the main and the drain, while the drain gate is made in the form of the main gate of the sleeve with the shank, covering the stem, and is connected to the fork in such a way that the end of the shank contacts only with the outer bearing surface of the fork, and the main valve stem - only with the inner one.

The drawing schematically shows the proposed device.

Shut-off and drain valve consists of body 1 with inlet 2, outlet 3 and drain 4 branch pipes. The main seat 5 and drainage 6 are made in the body, which are blocked by a shut-off body 7, consisting of the main valve 8 with a stem 9 and

15 drain gate made in the form of a bushing 10 enclosing the stem 9 with a shank 11. Between the end face of the shank 11 and the stem 9 a fork lug 12 of the lead screw 13 is inserted. Between the gate 8 and the bushing

10 spring 14 is installed.

Shutoff-drain valve works as follows.

In the initial position, the working body

25 is located in the input line, the main gate 8 is pressed against the seat 5 by the force transmitted by the bearing surface 15 of the lead screw 13 through the shank 11 of the drain gate 10.

30 .When unscrewing the screw 13 from the housing

1 the reference surface moves

15 of the screw and allows the drain valve 10 to move under the action of the spring 14, which continues to press the main valve 8 against the seat 5 with a force sufficient to seal the seal of the container "main valve-seat". With further unscrewing of the screw 13, the drain plug 10 is pressed against the seat 6 by the force of the spring 14, which is also sufficient to seal the seal

"drainage gate-saddle". The drainage line is closed. Moving further, the lead screw 13 with the support surface 16 presses the main gate 8 from the seat 5, brings the main gate to the stop in the drainage gate

10 and presses the latter to the saddle 6.

The input line is connected to the output. Drainage of the working fluid from the outlet line is carried out when the screw 13 is screwed into the body 1, and the inlet line is blocked first and only after that the drain gate 10 moves away from the seat 6. Thus, when the valve is actuated, one of the gates (main or drain) is located in contact and is pressed against its seat with the force necessary for sealing, and completely excludes the possibility of simultaneous communication of the inlet, outlet and drainage lines.

Claim

Shut-off and drain valve, including a body with inlet, outlet and drain pipes, main and drain seats, an axially movable shut-off body with main and drain sealing surfaces and a lead screw with a fork grip, characterized in that, in order to prevent leakage of the working medium between the inlet and drain pipes, the shut-off element consists of two gates, spring-loaded relative to each other, the main and the drain, while the drain gate is made in the form of a sleeve with a shank enclosing the stem, and is connected to the fork in such a way that the end of the shank has contact with the outer support surface of the grip, and the main valve stem - with the inner one.

Sources of information taken into account in the examination

A mandatory element of equipping autonomous water supply systems in summer cottages and country houses is a check valve. It is such a technical device, which can have a different design, that ensures the movement of fluid through the pipeline in the required direction. Check valves installed in the autonomous water supply system reliably protect it from the consequences of emergency situations. Relating to direct acting valves, check valves operate automatically, for which the energy of the working medium transported through the pipeline system is used.

Purpose and principle of operation

The main function that a check valve for water performs is that it protects the water supply system from critical parameters of the flow of liquid transported through the pipeline. The most common cause of critical situations is the shutdown of the pumping unit, which can lead to a number of negative phenomena - draining water from the pipeline back into the well, spinning the pump impeller in the opposite direction and, accordingly, breakdown.

Installing a check valve on water allows you to protect the plumbing system from the listed negative phenomena. In addition, the water check valve prevents the consequences that water hammer causes. The use of check valves in pipeline systems makes it possible to make their work more efficient, as well as to ensure the correct functioning of the pumping equipment that such systems are equipped with.

The principle of operation of the check valve is quite simple and is as follows.

• The flow of water entering such a device under a certain pressure acts on the locking element and depresses the spring, with which this element is held closed.
• After compressing the spring and opening the locking element, water begins to move freely through the check valve in the required direction.
• If the pressure level of the working fluid flow in the pipeline drops or the water begins to move in the wrong direction, the spring mechanism of the valve returns the shut-off element to the closed state.

By acting in this way, the non-return valve prevents the formation of unwanted backflow in the piping system.

When choosing a model of a valve installed on a water supply system, it is important to know the regulatory requirements that manufacturers of pumping equipment impose on such devices. The technical parameters by which, in accordance with these requirements, a check valve for water is selected are:

• operating, trial and nominal closing pressure;
• landing part diameter;
• conditional throughput;
• tightness class.

Information on what technical requirements the check valve for water must meet is usually contained in the documentation for pumping equipment.

To equip domestic water supply systems, spring-type check valves are used, the diameter of the conditional passage is in the range of 15–50 mm. Despite their compact size, such devices demonstrate high throughput, ensure reliable operation of the pipeline, low noise and vibration levels in the pipeline system on which they are installed.

Another positive factor in the use of check valves in the water supply system is that they help reduce the pressure created by the water pump by 0.25–0.5 atm. In this regard, the check valve for water allows you to reduce the load both on individual elements of pipeline equipment, and on the entire water supply system as a whole.

Design features

One of the most common materials from which the body part of the water return valves is made is brass. The choice of this material is not accidental: this alloy demonstrates exceptionally high resistance to chemically aggressive substances, which can be present in the water transported through the pipeline in a dissolved or suspended state. Such substances, in particular, include mineral salts, sulfur, oxygen, manganese, iron compounds, etc. The outer surface of the valves, which is also exposed to negative factors during their operation, is often protected with a special coating applied by the galvanic method.

The check valve device assumes the presence of a spool, for the manufacture of which brass or durable plastic can also be used. The sealing gasket present in the design of the check valve can be rubber or silicone. For the manufacture of an important element of the locking mechanism - springs - stainless steel is usually used.

So, if we talk about the structural elements of the spring check valve, then this device consists of:

• housing of a composite type, the elements of which are interconnected by means of a thread;
• a locking mechanism, the design of which includes two movable spool plates mounted on a special rod, and a sealing gasket;
• spring installed between the spool plates and the seat at the outlet of the through hole.

The principle of operation of the spring check valve is also quite simple.

• The flow of water entering the check valve at the required pressure acts on the spool and depresses the spring.
• When the spring is compressed, the spool moves along the stem, opening the orifice and allowing fluid to flow freely through the device.
• When the pressure of the water flow in the pipeline on which the non-return valve is located, or in cases where such a flow begins to move in the wrong direction, the spring returns the spool to its seat, closing the through hole of the device.

Thus, the scheme of operation of the check valve is quite simple, but nevertheless ensures the high reliability of such devices and the efficiency of their use in pipeline systems.

Main types

Having figured out how the check valve installed in the plumbing system works, you should also understand how to choose it correctly. On the modern market, various types of check valve devices are offered, the design, material of manufacture and the scheme of operation of which can vary greatly.

The valve body of this type consists of two cylindrical elements connected to each other by means of a thread. The locking mechanism includes a plastic stem, upper and lower spool plates. The position of the elements of the locking mechanism in the closed state, as well as their opening at the moment when the pressure of the water flow reaches the required level, is provided by a spring. Between themselves, the constituent elements of the body are connected using a sealing gasket.

Distinctive features of this type of shutters are easy to see even in the photo. The brass body of such a valve in its middle part, where the spool chamber is located, has a spherical shape. This design feature allows you to increase the volume of the spool chamber and, accordingly, the throughput of the check valve. The locking mechanism of this type of water valve, which is based on a brass spool, works on the same principle as in valve devices of any other type.

Many of those who decide to do the installation of the pipeline system on their own often have the question of why a check valve is needed, equipped with drainage and air vent systems. The use of check valves of this type (especially for equipping pipelines through which hot working fluids are transported) makes it possible to simplify the process of installation and maintenance of such systems, increase their reliability, reduce the total hydraulic pressure, and reduce the number of field connections.

On the valve body of this type, which can even be seen in the photo, there are two nozzles, one of which is used to mount the air vent, and the second serves as a drainage element. The branch pipe for the air vent, on the inner surface of which a thread is cut, is located on the device body above the spool chamber (its receiving part). Such a pipe is needed to bleed air from the pipeline system, for which a Mayevsky crane is additionally used. The purpose of the branch pipe, which is located on the opposite side of the body - at the outlet of the valve, is to drain the liquid accumulated after the valve device from the system.

If a horizontal non-return valve is installed, its air outlet can be used to mount a pressure gauge. If you put the combined check valve vertically on the pipeline, then its drainage pipe can be used to drain the water accumulated after such a device, and the air vent pipe can be used to remove air plugs from that part of the pipeline that is located before the check valve. That is why, when deciding how to install a combined type check valve, you should clearly understand what functions such a valve should perform.

Check valves, the body of which is made of polypropylene, even if you look at the photos of such devices, outwardly very much resemble oblique bends. These types of check valves, for the installation of which the polyfusion welding method is used, are installed on pipelines also made of polypropylene. An additional oblique outlet in the design of gates of this type is necessary to accommodate the elements of the locking mechanism in it, which facilitates the maintenance of such a device. Thanks to this constructive solution, it is not difficult to carry out maintenance and repair of this type of check valve - it is enough to remove the elements of the locking mechanism from its additional outlet without violating the integrity of the device body and the tightness of its installation in the pipeline system.

Other types of non-return valves can be installed in pipeline systems designed for transporting water.

• The flap check valve is equipped with a special locking element - a spring-loaded petal. A big disadvantage of this type of shutters is that when they are triggered, significant shock loads are created. This negatively affects the technical condition of the gate device itself, and can also cause a hydraulic shock in the pipeline system.
• Double-leaf type check valve devices are compact in size and light in weight.
• The lifting coupling check valve includes a spool freely moving along the vertical axis as a locking element. The operation of the locking mechanism can be based on the gravitational principle, when the spool returns to the closed state under the influence of its own weight. A spring can also be used for this purpose. If you decide to install a gravity check valve on the pipeline, keep in mind that such a device can only be installed in vertical sections of the system. Meanwhile, the gravity valve is characterized by simple structure, while showing high reliability during operation.
• There are check valves, the locking element of which is a spring-loaded metal ball. The surface of such a ball can be additionally covered with a layer of rubber.

When deciding which check valve is better and whether an expensive valve of a more complex design is needed in the pipeline system, one should first of all get acquainted with the technical characteristics of such a device and compare them with the operating parameters of the pipeline system. The main purpose of the check valve, as mentioned above, is to pass water through the pipeline in the right direction and prevent the flow of liquid from moving in the opposite direction. In this regard, the check valve for water should be selected based on the pressure under which the water flow moves in the pipeline. Naturally, it is necessary to take into account the diameter of the pipes on which such a valve should be installed.

When installing the pipeline, it should also be borne in mind that the check valve can be installed in various ways. Flanged and wafer type check valves are installed on pipes of large diameter, and sleeve valves are installed on pipes of small diameter. The welded method of installing check valves is mainly used when mounting on polypropylene and metal-plastic pipes.

If you choose the right check valve and the way it is installed, such a device will not only last a long time, but also ensure the correct operation of the entire pipeline system.

How to install correctly

Having dealt with the question of why a check valve is needed, and with its role in the pipeline system, you should also study the rules for installing it on an already operating or just being created pipeline. Such devices are mounted on various elements of pipeline systems:

• on pipelines of autonomous and centralized water supply;
• on suction lines served by deep and surface pumps;
• in front of boilers, storage water heaters and water meters.

If you are interested in check valves that can be installed both vertically and horizontally, choose not gravity, but spring models. You can find out in which direction the water flow should move through the valve using a special arrow printed on the body of the device. When installing sleeve-type check valves, be sure to use FUM tape for good sealing. In addition, one should not forget that check valves need regular maintenance, so they must be installed in accessible places in the pipeline.

When installing a check valve on the suction line of a submersible pump, care should be taken to install a coarse filter in front of such a device, which will prevent mechanical impurities contained in underground water from entering the inside of the device. As such a filter, a perforated or mesh cage can also be used, in which a check valve is placed at the inlet end of the suction line of the submersible pump.

When installing a check valve on an already operating pipeline, you must first disconnect the system from the water supply and only then install the shut-off device.

How to make a check valve yourself

The simple design of the check valve allows, if necessary, to make it yourself.

To solve this problem, you will need the following materials and tools:

• a tee with an internal thread, which will serve as a body;
• a threaded coupling on the outer surface - a homemade check valve seat;
• rigid spring made of steel wire;
• a steel ball, the diameter of which should be slightly smaller than the diameter of the hole in the tee;
• steel threaded plug, which will act as a stop for the spring;
• a standard set of locksmith tools and a FUM sealing tape.
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