Check valve is a kind of automatic valve, also known as check valve, one-way valve, return valve or isolation valve. It is a kind of valve whose opening and closing parts are round disc and whose action is produced by its own weight and medium pressure to block medium backflow. Disc movement is divided into lifting type and swing type. Lift check valve is similar to globe valve in structure, only lack of stem to drive disc. The medium flows in from the inlet end (lower side) and flows out from the outlet end (upper side). When the inlet pressure is greater than the disc weight and its flow resistance, the valve is opened. On the contrary, the valve will be closed when the medium flows back. The swing check valve has an inclined disc which can rotate around the shaft. Its working principle is similar to that of the lift check valve. Check valve is often used as the bottom valve of pumping device, which can prevent the backflow of water. Combined use of check valve and stop valve can play the role of safety isolation,the disadvantages are high resistance and poor sealing when closing. The check valve can also be used to supply the auxiliary system whose pressure may rise above the system pressure.

According to the structure, it can be divided into lift check valve, swing check valve and butterfly check valve

1. Lift check valve is divided into vertical and horizontal.

2. Swing check valve is divided into three types: single disc, double disc and multi disc.

3. Butterfly check valve is straight through type.

STAVAL provides high performance check valve products, including Swing check valve, Lifting check valve, Titling check valve, External check valve, Wafer check valve etc.

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