Media reflux valve to prevent the selection method:
The role of this type of valve is the only allowed media to flow in one direction, and stop the flow direction. Usually the valve is automatically work in a direction of flow of fluid pressure, the valve flap to open; fluid flow the opposite direction, by the fluid pressure and the valve flap from the coincidence of disc acting on the valve seat to cut off flow. Which belongs to this type of valve the valve, which includes swing check valves and lift check valves. Swing check valves are ordinary hinge, there is a door the same disc as the freedom to tilt the seat leaning against the surface.
In order to ensure that the flap valve seat face every time to reach the appropriate position, the valve flap design in the hinge so that the valve flap is enough to swing space, and make a real disc, comprehensive engagement with the valve seat. All metal disc can be made of metal can also be embedded in the leather, rubber, or synthetic cover, depending on performance requirements. Swing check valve in the fully open position, the fluid pressure is almost free of obstruction, therefore the pressure drop through the valve is relatively small. Lift check valves on the valve seat is located in the valve body sealing surface.
In addition to this valve disc is free to lift, the other part of the same as the cut-off valve, the fluid pressure valve from the valve seat sealing surface of valve lift, medium return led to a seat on the disc down and cut off the flow. According to terms of use, the valve flap can be all metal construction, it can be rack mounted in the valve flap rubber mat or rubber ring form. The same as the cut-off valves, fluid channels through the lift check valve is narrow, so the check valve by lifting the pressure drop than the swing check valve a little bigger, and swing check valves for flow restrictions few.