What Is A Check Valve?

A check valve is a valve whose opening and closing parts are circular discs and which rely on their own weight and medium pressure to produce movement to block the backflow of the medium. It belongs to the category of automatic valves, also known as non-return valves, one-way valves, return valves or isolation valves. The disc movement modes are divided into lifting and swing types. The lifting check valve is similar to the stop valve in structure, only lacking the valve stem that drives the disc. The medium enters from the inlet end (the swing check valve has a disc that is tilted and can rotate around the axis, and its working principle is similar to that of the lifting check valve. The check valve is often used as a bottom valve of a pumping device to prevent the backflow of water. The check valve is used in combination with the stop valve to play a role in safety isolation. The disadvantage is that the resistance is large and the sealing is poor when closed.