The swing check valve adopts a built-in rocker swing structure. All the opening and closing parts of the valve are installed inside the valve body and do not penetrate the valve body. Except for the sealing gasket and sealing ring for the middle flange part,  There is no leakage point as a whole, and the Du* valve may leak.  The valve disc of the lift check valve is located on the sealing surface of the valve seat on the valve body.  Except that the disc can be raised and lowered freely, the rest of the valve is like a shut-off valve. The fluid pressure lifts the disc from the seat sealing surface, and the backflow of the medium causes the disc to fall onto the seat and cut off the flow.

    　　 Swing check valve rocker arm and valve clack are connected by a spherical connection structure, so that the valve clack has a certain degree of freedom in the range of 360 degrees, and there is an appropriate trace position compensation.  Swing check valves have been widely used in many fields such as chemical industry, metallurgy, and pharmaceuticals.

    　　According to the conditions of use, the valve disc can be an all-metal structure, or it can be in the form of inlaid rubber pads or rubber rings on the disc holder.  Like a shut-off valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow rate of the swing check valve is restricted  Rarely.