Stainless Steel Swing Check Vavle

Check valve is a valve whose opening and closing parts are circular 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. Disc motion mode is divided into lifting type and swing type. Lift check valves are similar in construction to globe valves, lacking only the 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. Check valve and globe valve used in combination, can play the role of safety isolation. The disadvantage is that the resistance is large and the sealing is poor when closed.