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Check valves

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Check valve Yoshitake SCV2 Check valve Yoshitake SCV-2
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  • Material: cast stainless steel, stainless steel
Check valve Yoshitake SCV3 Check valve Yoshitake SCV-3
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  • Material: cast stainless steel
Check valve Yoshitake SCV4 Check valve Yoshitake SCV-4
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  • Material: stainless steel
Check valve Yoshitake SCV4EN Check valve Yoshitake SCV-4EN
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  • Material: stainless steel
Check valve Zetkama 287A Check valve Zetkama 287A
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  • Compound: DN15–DN300
  • Operating pressure: 16 bar
  • Max working temperature: 300 (°C)
  • Material: cast iron, GG25
Check valve Zetkama 287C Check valve Zetkama 287C
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  • Compound: DN15–DN200
  • Operating pressure: 25 bar
  • Max working temperature: 350 (°C)
  • Material: ductile iron GGG40.3
Check valve Zetkama 287F Check valve Zetkama 287F
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  • Compound: DN15–DN200
  • Operating pressure: 40 bar
  • Max working temperature: 400 (°C)
  • Material: cast steel 1.0619
Check valve Zetkama 275I Check valve Zetkama 275I
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  • Compound: DN15–DN300
  • Operating pressure: 40 bar
  • Max working temperature: 300 (°C)
  • Material: stainless steel

Check valves

The check valve is a type of pipeline protective fittings, designed to organize the flow of the medium in only one direction, and to prevent its reverse flow. It can be used with both liquid and gaseous media. Due to their design, check valves perform their function automatically, being direct acting devices.

Practical problems solved with check valves

Check valves can be produced both as separate products and as integral units of various plants and units. They are used in a wide variety of hydraulic and gas pipeline systems. The most common practical tasks that are solved by using check valves:

  • at water intakes (intakes of other liquid media from open sources and containers) with surface and semi-submersible pumps, to prevent the drainage of the vertical intake column and the working body of the transfer pump;
  • at the inlet of make-up systems for closed circulation hydraulic circuits;
  • in systems of transportation (supply) of liquid media and hydraulic drives, which include several injection pumps, to exclude their mutual influence;
  • in filter installations, to prevent abnormal backwash flow through filters;
  • for breaking into limited sections of long main pipeline lines, in order to minimize the loss of medium in case of leakage in certain sections;
  • in general - in pipelines and pipeline equipment, where it is necessary to ensure strictly unidirectional movement of working media.

Basic design options for check valves

  The most common check valve designs are:

  • in the form of a seated valve, in which the shut-off element has the form of a conical or ball valve, with its fit on the valve seat. The seat-and-slide design of the check valve provides a higher tightness of the blocking of the flow of the medium, in a wider range of operating temperatures and pressures. At the same time, it is very sensitive to the presence of contamination, and has structural limitations on the pipeline bore diameter, and therefore is used on pipelines with a maximum bore diameter of 200 mm (DN200).
  • in the form of a reverse shutter, in which the closure element (slammer) has the form of a poppet disk. This design of the check valve generally provides less tightness of closing, in a smaller range of operating temperatures and pressures. At the same time, it is insensitive to work in a polluted environment, and has practically no restrictions on the diameter of the pipeline (up to 700 mm and more).
  • Wafer type a) spring disc and b) butterfly valve. These design options are characterized by minimal construction dimensions, which makes it possible to manufacture them without mating connecting flanges, with their installation in the interflange space of two adjacent pipes with mating connecting flanges.

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Rice. Check valve diagram with cone or poppet valve

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Rice. Ball valve check valve diagram

In its most general form, the design of a typical seat-and-spool check valve includes:

  • straight through body with two connecting pipes, inlet and outlet, and a valve seat (spool);
  • a removable valve body cover for access to the locking mechanism assembly;
  • a spring-loaded shut-off element - a cone or ball-type spool (there are variants of spools and without springs, which are lowered into the saddle under their own weight). Since the spring force creates a differential pressure across the check valve, check valve springs are sized to their lowest value.

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Rice. Reverse gate circuit

A typical design of a check valve differs in that the shut-off element in it is a rotary slam, the pivot axis of which is located above the axis of the medium flow (the axis of its seat). In the presence of a flow of the medium, the flapper under the influence of its pressure rotates through a certain angle and opens the flow section. When the flow of the medium stops, the flapper under its own weight is lowered onto the seat, blocking the flow area.

Non-return valves designed for installation in pipelines, as a rule, have the same connecting pipes at the inlet and outlet. For orientation in the direction of the flow through when installing the valve, a corresponding arrow is usually applied to its body.

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Rice. Wafer Type Spring Disc Check Valve

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Rice. Wafer Type Butterfly Check Valve

Check valve operating principle

In the presence of a direct flow of the medium through the pipeline, its pressure overcomes the resistance of the spool spring or the own weight of the slammer, the spool (slammer) rises above the valve seat, leaving the flow area open. Before the start of the reverse flow of the medium through the pipeline, at a certain moment in time, its velocity becomes equal to zero. At this moment, under the influence of the pressure spring or its own weight, the closing element is lowered onto the valve seat, after which the reverse flow of the medium becomes impossible.

Materials for manufacturing check valve parts

Check valves, as elements of protective pipeline fittings, are used in pipeline networks with a wide variety of performance characteristics: both in high-temperature and cryogenic equipment, with high and low (evacuated) pressure, with working media of various elemental composition and chemical activity. Depending on the performance characteristics and the chemical composition of the working fluids, the bodies and shut-off elements of the check valves can be made from:

  • cast irons;
  • carbon steels;
  • high-alloy stainless steels;
  • copper alloys: brass and bronze;
  • titanium;
  • special, extra heat-resistant and corrosion-resistant alloys;
  • non-metallic materials.

Additional tightness of the closing element on the valve seat can be provided by elastic sealing elements made of technical rubber, silicone, fluoroplastic and other materials.

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Check valves in the range of OPEKS Energosystems

To equip heat engineering systems with pipeline valves, such as individual heating units (ITPs) in modular design, built on the basis of heat exchangers and other heat engineering equipment produced by OPEKS Energosystem, our company offers impeccably high-quality and repeatedly tested in practice products of our regular partners: well-known in the world market Japanese company Yoshitake, Polish company Zetkama and German KSB. Check valves are presented in our assortment:

  • with threaded, flanged and wafer-type installation on the pipeline;
  • with bore diameters from DN15 to DN300;
  • for working pressures up to 4.0 MPa inclusive;
  • for work in the range of operating temperatures up to 400 degrees C;
  • for working with working media of various chemical composition and chemical activity, with casings made of cast iron, cast carbon steel and stainless steel.
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Check valves

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