Silencing check valveIs to stop the flow in the opposite direction, only allow the medium to flow in one direction. Usually the valve operates automatically, flowing in one directionFluid pressureUnder the action, the valve disc opens; When the fluid flows in the opposite direction, it is acted on by the fluid pressure and the self-coincidence disc of the discThe seatThus cutting off the flow. Should not be used for containing solid particles and viscositymedium。

Among themInternal threaded check valve.Butterfly check valveValves of this type includeSwing check valveandLift check valve. Swing check valves are availablehingeMechanism, with a gate - like disc resting freely against the sloped seat surface. To ensure that the disc reaches the seat face in the proper position each time, the disc is designed on a hinged mechanism so that the disc has sufficient swing space and provides true, full contact with the seat. The disc may be made entirely of metal, or may be inlaid with leather, rubber, or synthetic cover, depending on performance requirements. Swing check valve in full open condition,Fluid pressureAlmost unimpeded, therefore through the valvePressure dropRelatively small. The disc of the lift check valve is locatedThe valve bodyonThe seatSeal face. The valve is like this except that the disc is free to rise and fallGlobe valveLikewise, fluid pressure causes the disc to lift from the seat face,mediumBackflow causes the disc to fall back onto the seat and cut off the flow. Depending on the conditions of use, the disc may be of all metal construction or may be mounted on the disc frameRubber matOr in the form of a rubber ring. Like globe valves, the passage of fluid through the lift check valve is narrow, so the pressure drop through the lift check valve is greater than the swing check valve, and the flow through the swing check valve is less restricted. This kind of valve should be installed horizontally in the pipeline.