Yongjia Pinxin Valve Co., LTD

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difference between swing check and lift check

- Jan 11, 2019 -

People know check valves are used to prevent back flow in the line. They are also called non return valve.


旋启式止回阀


First of all, let's have a look at swing check valve. When the media flow comes through the line, the disc of valve swings into open position. Back pressure in the line holds the disc in the closed position. 


Regarding to lift check valve, Lift check valve is one of common check valve. It aslo used to prevent back flow in the line, and operate automatically, according to increases or decreases in line pressures. 


Difference between swing check valve,  media goes through a lift check is the same as a globe valve.  Increasing pressure below the disc makes the disc raises up off of the seat, while a drop in pressure on the inlet side and a build up of pressure on the outlet side causes the valve to close. Back pressure in the line keep the disc in closed position.


General speaking, lift check valves are installed in a horizontal flow, but may be installed in vertical lines with the assistance of a spring behind the disc.  Compared to swing check valve, the lift check valve in its closed position offers a more effective shutoff and tighter seal.