Flange Check Valve

What ischeck valve?

Acheck valve,clack valve,non-return valve,reflux valve,retention valveorone-way valveis a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.

aretwo-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are varioustypes of check valvesused in a wide variety of applications.Check valvesare oftenpart of common household items. Although they are available in a wide range of sizes and costs,check valvesgenerally are very small, simple, or inexpensive.Check valveswork automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of mostcheck valvesare made of plastic or metal.

ball check valveis acheck valvein which the closing member, the movable part to block the flow, is a ball. In someball check valves, the ball is spring-loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal. The interior surface of the mainseats of ball check valvesare more or less conically-tapered to guide the ball into the seat and form a positive seal when stopping reverse flow.

Wafer check valveshave asolid thermoplastic bodywith a very thin "wafer" profile that makes them anideal check valvefor applications that require valves with short takeout lengths.Wafer check valvesare used in applications where it is essential to ensure fluid flow passes in only one direction.

Adiaphragm check valveuses a flexing rubber diaphragm positioned to create a normally-closed valve. Pressure on the upstream side must be greater than the pressure on the downstream side by a certain amount, known as the pressure differential, forthe check valveto open allowing flow. Once positive pressure stops, the diaphragm automatically flexes back to its original closed position.

Aswing check valveor tilting disc check valve is a check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow.

stop-check valve

stop-check valveis acheck valvewith override control to stop flow regardless of flow direction or pressure. In addition to closing in response to backflow or insufficient forward pressure (normal check-valve behavior), it can also be deliberately shut by an external mechanism, thereby preventing any flow regardless of forward pressure.

lift-check valveis acheck valvein which the disc, sometimes called a lift, can be lifted up off its seat by higher pressure of inlet or upstream fluid to allow flow to the outlet or downstream side. A guide keeps motion of the disc on a vertical line, so the valve can later reseat properly. When the pressure is no longer higher, gravity or higher downstream pressure will cause the disc to lower onto its seat, shutting the valve to stop reverse flow.


至: Hebei Huahui Valve Co., Ltd
Your E-mail:

Send to other suppliers

Other supplier products

DIN Resilient Seated Gate Valve
DIN Resilient Seated Gate Valve Features DIN3352-F4 , DN40-DN1200 The ductile iron core is fully vulcanized with EPDM rubber, no iron parts are exposed to the medium and the exce...
Socket End Resilient Seated Gate Valve
Socket End Resilient Seated Gate Valve Features DIN3352 , 63mm-315mm The ductile iron core is fully vulcanized with EPDM rubber, no iron parts are exposed to the medium and the excellen...
Differential Pressure Control Valve
Differential Pressure Control Valve Introduction of Does not require external energy to rely on the pressure change of the controlled medium to automatically adjust, automatically e...
Flexible rubber disc check valve
Flexible rubber disc check valve Product Descriptionof Technical Parametersof Nominaldiameter(mm) 50~400 50~400 Nominalpressure(Mpa) Testingpressure Shell(Mp...
Flanged Pressure Relief Valve
Flanged Pressure Relief Valve Product Description Pressure relief / hold pressure valve is mainly used in fire protection or other water supply systems to prevent system overpr...

Same products

BRASS BALL VALVES 卖方: MSTN International Technologies Company BRASS INTERNAL THREAD BALL VALVE MstnLand's series of brass internal thread brass ball valvesused...
Disc Wafer Check Valve
Disc Wafer Check Valve 卖方: ZhengFeng Valve Group ZECO Valve Group, founded in 1991 with focus on manufacturing china water valve, including contro...
GREY FRPP FOOT/BOTTOM VALVE 卖方: Kaixin Pipeline Technologies Co.,Ltd Grey FRPP Foot Operated Bottom Valve Custom 4 Inch DN15-DN300 Low Price Industrial Plastic Foot V...
Hydraulic Control Valve
Hydraulic Control Valve 卖方: Tianjin KXC Metal Products Co., Ltd are used to contain and transfer the flow and pressure of hydraulic fluid in hydraulic systems. ...
Thread Globe Valve
Thread Globe Valve 卖方: Tianjin KXC Metal Products Co., Ltd is a linear motion valve and are primarily designed to stop, start and regulate flow. The disk o...