Check valve for a water pump: operating principle

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The principle of operation of various types of check valves

The principle of operation of various types of check valves

Design and implementation of protective reinforcement material, which is used to supply autonomous systems take into account existing regulatory requirements. Specifications (nominal, working, test and closing pressure, the diameter of joining, conditional bandwidth tightness class) specified by the manufacturer in the data sheet products.

Conventional passage spring check valves household purposes is 15 ÷ 50 mm. Compact protective devices provide high bandwidth operational reliability, low noise levels in the operating position.

Important! Tension spring counteracts the force flow. Opening of the valve reduces the pressure of the pump to 0.25 ÷ 0.5 atmospheres.

The check valve spring with a plastic shutter manufacturer ITAP

The check valve spring with a plastic shutter manufacturer ITAP

Apparatus water back pressure valve

The material for the stamping elements body assembly is made of brass. An alloy resistant to corrosive substances (oxygen, mineral salts, sulfur, manganese, iron compounds and organic pr.), which are in the water in dissolved form or suspended condition. The outer surface of the article coated with electroplated (nickel).

Details of the spool is made of an alloy of copper with zinc or a high polymer. The material of the gasket between the locking discs - rubber or silicone. The spring is made from a special grade of stainless steel.

Apparatus polypropylene spring loaded check valve: 1 - body, 2 - Tube 3 - BS item with threaded 4 - rod with a slide valve plate, 5 - spool washer 6 - spring 7 - o-ring traffic jams

Apparatus polypropylene spring loaded check valve: 1 - body, 2 - Tube 3 - BS item with threaded 4 - rod with a slide valve plate, 5 - spool washer 6 - spring 7 - o-ring traffic jams

Common design elements spring-return valves:

  • a composite body (muff-coupled elements with an internal thread at the inlet and outlet, spool chamber);
  • working body - a movable slide, consisting of a rod, the two spool plates and sealed interdisk gaskets;
  • executive body of constipation - a spring, which is located between the plates and the valve seat (stopper in the body of the housing).

Operating the check valve body reciprocating motion in the slide valve chamber. Plates slide over the valve stem. The flow is distributed over a channel, which has a constant cross-section. Water evenly washes the locking body from all sides.

If the flow pressure exceeds the spring force, the movable portion of the valve opens a gap for the passage of water in a predetermined direction. When aligning overpressure before and after the security device, or exceeds the predetermined pressure after the valve spring moves the tray in the saddle.

the check valve is required for mounting auxiliary water supply, a ball valve, a manometer, fittings and other components

the check valve is required for mounting auxiliary water supply, a ball valve, a manometer, fittings and other components

Check valve spring box-

Demountable cylindrical housing consists of two parts having a threaded connection. The movable slide is formed from a plastic rod, the upper and lower plates of brass. shutter elements shared sealed gasket. steel spring tension counteracts the pressure of the flow through the poppet valve mechanism.

Check valve spring thimble with brass spool

The distinguishing feature of the check valve unit for water, a spherical shape slide valve chamber - a large bandwidth compared to traditional forms of reinforcement.

a check valve spring device with brass spool 1 and 2 - nickel-plated brass body 3 - a movable spool, 4 - spring 5 - brass plunger plates 6 - EPDM gasket

a check valve spring device with brass spool 1 and 2 - nickel-plated brass body 3 - a movable spool, 4 - spring 5 - brass plunger plates 6 - EPDM gasket

Combined spring-loaded check valve with drain and air vent

Socket with internal thread for vent mounted on the housing, on the slide valve chamber receiving region. The air is vented by means bleed screw.

Drainage pipe with an internal thread and a stopper is located on the opposite side of the body, at the outlet of the check valve.

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With vertical mounting apparatus allows the discharge of water downstream of the valve and removing air pockets from the pipeline to the valve. In horizontal installation the combined nozzle device for air removal is used for mounting pressure gauge.

Combination check valve assembly reduces the number of compounds that reduce total hydraulic armature resistance, increases reliability of the system, facilitates the assembly and maintenance process system.

Check valve with drain and air vent

Check valve with drain and air vent

Check valve spring with a polypropylene housing

Check valves are used in the propylene housing for water systems made from the propylene tubes. Externally, the fitting is similar to an oblique tap. Safety valve of propylene attached to the conduit by welding polifuzionnoy. For serviceability, the disposable compound saddle and the locking mechanism is moved out of the slide perpendicular to the plane of the slide valve chamber. Constructive position allows to get a valve closing mechanism for cleaning and maintenance without disturbing the integrity of the housing and systems.

The centralized water main pipes used flap, tray, folding, and the flanged ball check valves. For compounds of the large-diameter flanges and valves are used flanged mounting the tie rods. For the installation of check valves in the pipework of the propylene tubes apply thermal contact welding.

A spring check valve made of polypropylene

A spring check valve made of polypropylene

Terms return valve installed on the water

Safety valves used in the autonomous supply systems, water pipe networks intrahouse in apartment buildings, with a central separate cold and hot water. Check valves are mounted on the suction surface and subsurface pump to water meters, boilers, DHW cylinders.

Spring water back-pressure valves do not have friction surfaces, so they can be installed in any position (vertically, horizontally or obliquely). The arrow on the unit indicates the direction of motion of the medium, its vector must match the installation position of the protective tube.

Device needs regular maintenance. Install a check valve in an accessible for cleaning, inspection, repair or replacement site.

In the valve housing there is an arrow which indicates the direction of water flow

In the valve housing there is an arrow which indicates the direction of water flow

Check valve for a pump or water pump station

a check valve is an indispensable element for pump stations, but the pre-packaging Appliance installation protective shutter is not included. When buying a check valve pay attention to the mounting dimensions of the device.

Check valves for submersible pumps

If the protective valve installed on the suction pipe line, its diameter must be the same tube diameter. When the damper is installed on the suction inlet of a submersible pump, parts dimensions must be leak-proof connection.

Important!Deposition of solids flow to the internal surface of the valve limits the throughput capacity of the device and gives shutter tightness.

Complete automation with a check valve for a submersible pump

Complete automation with a check valve for a submersible pump

Manufacturers protective sheath made sure how to install a check valve at the pump:

  • before return valve for the water pump recommend Filters rough mechanical treatment;
  • modern model of deep and well pumps equipped with safety fittings direct action on the stage of development of the equipment;
  • require special protection receiver check valve to pump downhole, which is installed on the suction line from well, well or open water. Mesh or perforated stainless steel holder connected to the check valve by means of threads.

Check valves for pumping stations

Check valve for surface pumping station performs the same functions as a protective device for a downhole assembly. The difference is that the device is mounted on the suction nozzle self-priming pressure blower.

Check valve with a strainer for the pumping station

Check valve with a strainer for the pumping station

The check valve on the water with his own hands

Check valve assembly with his own hands is theoretically possible. Consumables buy a set of fittings in the sanitary department of the nearest store housewares.

For the realization of creative ideas need:

  • tee with an internal thread (check valve body);
  • an externally threaded sleeve (forms a seat for the shutter);
  • spring steel of sufficient rigidity, of suitable diameter and length (for overrunning turns inside tee);
  • steel ball, whose diameter is slightly smaller than nominal width tee;
  • a blind plug - stop for the spring ( "Dad");
  • sealing threaded connection (fum, flax);
  • Sanitary set of keys.

Water flow comes from the coupling end and changes its direction at the outlet 90 °.

The circuit assembly of the spring return valve with his own hands

The circuit assembly of the spring return valve with his own hands

The complexity of the self-assembly of the check valve is to select the actuator and parts. If the connections are tight will provide expertise and production skills of plumbing work, the quality of accessories ensure complicated.

For actuator factory check valve used special spring steel. The movement of the spring-loaded locking discs duplicated guide rod. Materials for the manufacture of valve have the compatibility in the process equipment. Technical parameters of products meet the requirements specified in the accepted regulations. The manufacturer provides a warranty for its products.

Important! To ensure the reliability and quality of operation of the check valve, assembled at home - it is impossible.

Dimensions and operating principle of box-spring loaded check valve 1 and 2 - a housing; 3 - spring; 4 - plastic rod; 5 - seal; 6 - top plate; 7 - the bottom plate; A - 34,5-79 mm; B - 46-80,5 mm; G - 1 / 2-2 "

Dimensions and operating principle of box-spring loaded check valve 1 and 2 - a housing; 3 - spring; 4 - plastic rod; 5 - seal; 6 - top plate; 7 - the bottom plate; A - 34,5-79 mm; B - 46-80,5 mm; G - 1 / 2-2 "

Price-return valve for the water pump

Prices of existing protective reinforcement depend on the brand manufacturer bandwidth (diameter) of the valve and constructive modifications. main reinforcement value exceeds the price of household devices used dozens of times.

Comparative table of prices of non-return valves for water from different manufacturers:

Manufacturer Diameter, mm Price per pcs., Rubles
Check valve polypropylene
AQUA-S Pipeline Systems 20
25
32
110,00
136,00
204,00
VALTEC (Italy) 20
25
32
128,00
160,00
274,00
Check valve spring box-
VALTEC (Italy) 15
20
25
191,00
263,00
390,00
Danfoss CO (Denmark) 15
20
25
561,00
735,00
962,00
Tesofi (France) 15
20
25
282,00
423,00
563,00
ITAP (Italy) 15
20
25
366,00
462,00
673,00
Combined spring-loaded check valve with drain and air vent
VALTEC (Italy) 15
20
25
652,00
1009,00
1516,00
Check valve spring thimble with brass spool
VALTEC (Italy) 15
20
25
228,00
198,00
498,00

Analyzing the information provided on the websites of the officials and the companies that produce safety valves can be conclude that the check valves to pump water to increase the reliability and performance of the self-contained water supply.

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