Patent ID: 6892758

Claim:
A check valve comprising: a case member which forms a fluid path; a valve seat surface which is formed in the case member and disposed in the middle of the fluid path; a valve body which is disposed downstream of the valve seat surface in the fluid path and which opens and closes the fluid path by seating on and separating from the valve seat surface; and a helical compression spring which is disposed in the case member and urges the valve body in a valve closing direction, wherein a wall surface is formed in the case member, the wall surface restricting a movement area of the valve body in a direction perpendicular to a pressure action direction X, the pressure action direction X taken as a direction of action of a pressure of a fluid upstream of the valve seat surface, a rod that transmits urging force of the helical compression spring to the valve body is disposed between the valve body and the helical compression spring, the rod changing a direction of the urging force transmitted to the valve body such that the urging force is oblique to the pressure action direction X, thus causing the valve body to be urged toward the wall surface, and the rod having a spring receiving surface that abuts with an end portion of the helical compression spring, the spring receiving surface being shaped so as to widen along the urging force action direction of the helical compression spring with respect to the rod.