| 摘要 |
Disclosed is a check valve in which a valve body (11) is composed of an elastic valve body portion (12) and an inelastic valve body portion (13), a valve seat (7) is composed of a first valve seat portion (14) and a second valve seat portion (15), and the valve body (11) is fixed to a valve shaft (18) passing though a center of the valve body (11) and supported in position so as to be axially movable, in which a valve body abutment plate (22) capable of abutting the elastic valve body portion (12) from the fluid outlet (4) side is supported to the valve shaft (18) so as to be axially movable, the valve body abutment plate (22) being provided with: an elastic valve body portion pressing portion (23) for pressing on an outer peripheral portion of the elastic valve body portion (12); and backflow fluid pressure exerting holes (25) for causing the fluid pressure from the fluid outlet (4) side to be exerted on the elastic valve body portion (12), and in which springs (27) for urging the valve body (11) into abutment with the valve seat (7) through the valve body abutment plate (22) are interposed between the valve body abutment plate (22) and a shaft support portion (17) provided on the fluid outlet (4) side. Therefore, it is possible to obtain a check valve which provides satisfactory sealing property against backflow.
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