Unidirectional Check Valve

The check is only allowed to medium flows in one direction, and stop the flow direction. This valve is normally automatic work, in a direction of flow of fluid pressure, the valve opens, The opposite direction of fluid flow, the fluid pressure and disc of coincidence role in seat disc, and cut off the flow. One check valve is belong to this type of valve, it includes swing check valves and movements of check valve. Swing check valves have raised hinge institutions, there is a gate valve disc freely on surface of the valve seat. In order to ensure that each valve flap valve seat surface can reach the right position, disc hinge agencies, in order to design in the disc has enough space, and the rotary valve genuine, comprehensive and seating contact. All valve can be made of metal, can be embedded in the metal, leather, rubber, or use synthetic coverage, depending on the use of performance requirements. Swing check valves in the fully open state, almost unimpeded fluid pressure, the pressure drop through the valve is relatively small. Movements of check valve disc located at body seating surface. This valve disc is free to except movements, like the rest of the cut-off valve, pressure from the valve seat sealing surface lift, medium return to the valve seat valve down, and cut off the flow. According to the conditions of use, the valve can be full of metal structure, also can be in the disc rubber pad shelves Mosaic or in the form of rubber ring. Like the cut-off valve, fluid movements of check valve through the channel is narrow, so movements of check valve through the pressure drop than swing check valve, and swing check valves are very few restrictions.