| 摘要 |
[Problem] To provide a pressure regulator comprising an adiabatic compression preventing mechanism and a pressure indicating mechanism. [Solution] A pressure regulator (A) comprises an adiabatic compression preventing mechanism (B) and a pressure indicating mechanism (C). The adiabatic compression preventing mechanism (B) comprises: a partitioning member (11) slidably disposed on a stepped part (10) at a primary-side passage (1) of the pressure regulator (A), the partitioning member (11) including a central small flow passage (11a) and a circumferential large flow passage (11f), the large flow passage being blocked when the partitioning member (11) makes contact with the stepped part (10), the partitioning member (11) further including a connection passage (17) formed at a downstream side of an upstream-side end surface (11d) so as to connect the small flow passage and the large flow passage; and a first spring (12) urging the partitioning member toward an upstream side in a gas flow direction. The pressure indicating mechanism (C) comprises: a cylindrical part (31) in which a first relief chamber (31a) having a small diameter and a second relief chamber (32b) having a large diameter are formed with an opening (31d) crossing the second relief chamber; a sliding member (32) including an indicating part (32a) and a pressure receiving part (32b), the sliding member (32) being slidably inserted in the cylindrical part (31); an O-ring (33) disposed on an end part of the first relief chamber; and a second spring (35) urging the sliding member toward the pressure receiving part. |
