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Check valve
Check valve
Check valve is a valve whose opening and closing parts are round disc and which acts by its own weight and medium pressure to block medium backflow. It is an automatic valve, also known as check valve, check valve, return valve or isolation valve. The motion mode of valve disc is divided into lifting type and swing type. Lift check valves are similar in construction to globe valves, except that they lack a stem that drives the disc. The medium flows in from the inlet end (lower side) and flows out from the outlet end (upper side). The valve is opened when the inlet pressure is greater than the sum of disc weight and flow resistance. On the contrary, the valve is closed when the medium flows back. Swing check valves have an inclined disc that rotates about the shaft and work in a similar way to lift check valves. The check valve is often used as the bottom valve of the pumping device to prevent the return of water. The combination of check valve and globe valve can play the role of safety isolation. The disadvantage is that the resistance is large and the sealing is poor when closed.
1. Do not let the check valve bear weight in the piping system. The large check valve should be supported independently, so that it is not affected by the pressure produced by the piping system.
2, when installing, pay attention to the direction of the medium flow should be consistent with the direction of the arrow marked by the valve body.
3. The lifting vertical flap check valve should be installed on the vertical pipe.
4, lift type horizontal flap check valve should be installed on the horizontal pipe.
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Cangzhou Hengjia Pipeline Co., Ltd.
Cangzhou Hengjia Pipeline Co., Ltd. located in “Chinese Pipeline Equipment Manufacturing Base”-Yanshan County of Hebei Province is a sales company of Hebei Longrun Pipeline Group Co., Ltd.
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