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The function of a fluorine lined check valve (also known as a check valve) is to only allow medium to flow in one direction and prevent flow in that direction. Usually, this type of valve operates automatically, and under the pressure of fluid flowing in one direction, the valve disc opens; When the fluid flows in the opposite direction, the valve seat is cut off by the fluid pressure and the self closing of the valve disc, which acts on the valve seat. It includes a swing check valve and a lift check valve