Hard Sealing check valve 

Working principle  Under the action of fluid pressure flowing in one direction, the valve page opens; When the fluid flows in the opposite direction, the pressure of the fluid and the self-overlapping flap of the flap act on the valve seat, thus cutting off the flow. Check valves belong to this type of valves, including swing check valves and lift check valves. The swing check valve has a hinge-chain mechanism, and a flap like a door rests freely on the inclined valve seat surface. In order to ensure that the valve flap can reach the proper position of the valve seat surface every time, the valve flap is designed in the hinge mechanism, so that the valve flap has enough swing space and makes the valve flap truly and comprehensively contact with the valve seat. The valve flap can be made entirely of metal, or it can be inlaid with leather or rubber, or it can be covered with synthetic surface, depending on the requirements of service performance. When the swing check valve is…

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