Importance

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Abstract

To provide at low cost a check valve which is relatively lightweight and not limited in applicable range thereof, has a good sealing property, and exhibits excellent pressure resistance and durability, a valve chamber (5) is formed between a fluid inlet (3) and a fluid outlet (4) in a valve casing (2), a valve seat (7) is formed to have a valve hole (6) on a fluid inlet (3) side of the valve chamber (5), and a valve body (11) is provided in the valve chamber (5) so as to be movable in a direction in which fluid flows and to be brought into contact with the valve seat (7) from a fluid outlet (4) side, the valve body (11) including, when seen from the fluid inlet (3) side, a first valve body portion (11a) and a second valve body portion (11b) which respectively have a small diameter and a large diameter, the valve seat (7) including a first valve seat portion (7a) and a second valve seat portion (7b) with which the first valve body portion (11a) and the second valve body portion (11b) are brought into contact, respectively, in which the second valve body portion (11b) has a flexural modulus which is set to be lower than a flexural modulus of the first valve body portion (11a), and in which the first valve body portion (11a) has a mechanical strength which is set so that the first valve body portion (11a) can mechanically bear a pressure of fluid on the fluid outlet (4) side.

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First Claim