| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure governing device which can flexible deal with the fluctuation of gas pressure in an upstream side duct so as to easily prevent an abnormal pressure rise in a downstream side duct and also which can be made small. SOLUTION: When gas pressure rises in the upstream side duct 11, the gas pressure of the upstream side duct 11 is reported to a flow rate adjusting part 14 through a pipe 61. Then pressure is raised inside a closed chamber 62a and the diaphragm 64 is moved to the side of a closed chamber 62b. A flow rate adjustment valve 66 linked with the diaphragm 64 is moved to the side of the closed chamber 62b, a flow path area is narrowed in a pipe 57 and, then, the gas pressure of the downstream side duct 12 which is lowered at a narrow pipe 22C is hardly transmitted to the pressure sensing part 50 of a governor 13. Thus, the pressure sensing part 50 of the governor 13 controls the opening degree of an adjustment valve 31 to be smaller, and the raised pressure of the downstream side duct 12 is adjusted to a set pressure value P<SB>1</SB>. COPYRIGHT: (C)2003,JPO
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