Center Guided Silent Globe Type Check Valve

Check valve is a kind of valve whose opening and closing parts are round disc and whose action is generated by its own weight and medium pressure to block the backflow of medium. It belongs to automatic valve, also known as check valve, check valve, return valve or isolation valve. The valve disc movement mode is divided into lifting type and swing type.

The structure of lift check valve is similar to that of stop valve, only the valve rod driving the disc is missing. The medium flows in from the inlet end (lower side) and out from the outlet end (upper side). When the inlet pressure is greater than the sum of disc weight and its flow resistance, the valve is opened. On the contrary, the valve is 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. The check valve is often used as the bottom valve of the pumping device, which can prevent the return of water. The combination of check valve and stop valve can play the role of safety isolation. The disadvantages are high resistance and poor sealing when closing.