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Imported piston check valve instructions: 1, the import piston check valve disk was disc-shaped, around the seat channel for rotation shaft rotation, because of the valve into the streamline linear flow resistance than the butterfly Non-return valve is small, suitable for low-flow rate and small changes in flow occasions, but not for pulsatile flow, the sealing performance is less than the lift. 2, Imported piston check valve flap along the valve body vertical centerline sliding check valve, internal thread check valve can only be installed on the horizontal pipe, the valve can be used on the high-pressure small-diameter check valve ball. 3, Imported piston check valve: the valve around the valve seat rotating pin check valve. Disc check valve structure is simple, can only be installed on the horizontal pipe, sealing better. 4, piston check valve: the valve along the valve body center line sliding valve. Pipeline check valve is a new type of valve, its small size, light weight, good processing technology, is one of the development direction of the check valve. But the fluid resistance coefficient is slightly larger than the swing check valve. 5, compression check valve: This valve is used as a boiler feed water and steam shut-off valve, it has a lift check valve and globe valve or angle valve of the integrated function.