Check Valve for Displacement-Type Pump

摘要

The present invention provides a check valve for a displacement-type pump, in which fluid pressure loss is reduced and which increases pump efficiency. The check valves are arranged in direction opposite to each other on the fluid discharge side and the fluid suction side of a pump chamber 22 b, valve bodies 40 are opened and closed only by fluid pressure flowing into or flowing out form the pump chamber 22 b, each of the valve bodies 40 has one axis in parallel with a flow path of the fluid, and a planar outer profile of the valve body is formed into a circular shape with the axis as the center.