Patent ID: 10753492

Abstract:
A check valve includes a casing in which a fluid inlet, a valve chamber, a valve seat portion, and a fluid outlet are formed; a valve body disposed in the valve chamber; and an urging unit that urges the valve body to the valve seat portion side. The valve seat portion includes a first valve seat portion disposed on the fluid inlet side of the valve chamber, and a second valve seat portion disposed on an outer periphery side of the first valve seat portion. The valve body includes a first seal portion capable of coming into close contact with the first valve seat portion, a second seal portion capable of coming into close contact with the second valve seat portion, and a first hinge portion and a second hinge portion each of which is a starting point of bending of the second seal portion. The first seal portion is formed in a disk shape using a non-elastic material, and the second seal portion is formed in a recessed frusto-conical shape in which a surface on a lower bottom side is formed of an elastic material.