Cast Steel Check Valve 2

The check valve belongs to this type of valve, which includes a swivel check valve and a lifting check valve. The swivel check valve has a hinge mechanism, as well as a door-like disc that is freely leaning against the sloping seat surface. To ensure that the disc reaches the right position on the seat surface each time, the disc is designed in a hinge mechanism so that the disc has enough swivel space and allows the disc to be truly and comprehensively in contact with the seat. The disc can be made entirely of metal, or it can be inlaid with leather, rubber, or synthetic coverage, depending on the performance requirements of the application. The rotary check valve is completely open under the condition that the fluid pressure is almost unobstructed, so the pressure drop through the valve is relatively small. The disc of the lifting check valve is located on the sealing surface of the seat on the valve body. This valve in addition to the disc can be free to lift, the rest of the same as the cut-off valve, the fluid pressure so that the disc from the seat sealing surface lift, the dielectric reflux caused the disc to fall back to the seat, and cut off the flow. Depending on the conditions of use, the disc can be an all-metal structure, or it can be a form of rubber pad or rubber ring inlaid on the disc rack. Like the cut-off valve, the fluid through the lifting check valve channel is also narrow, so the pressure drop through the lifting check valve is larger than the swivel check valve, and the flow of the swivel check valve is very limited.