Importance

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Abstract

A pressure-reducing apparatus is configured to reduce and regulate a primary-side gas pressure through two pressure-reducing valves arranged in series to generate a secondary-side gas pressure. In an intermediate passage, the gas after being pressure-reduced by the first pressure-reducing valve but before being pressure-reduced by the second pressure-reducing valve. The communication passage allows communication between the intermediate passage and a second pressure-regulating chamber of the second pressure-reducing valve. A check valve and configured to open when the gas pressure in the intermediate passage becomes higher than a predetermined valve opening pressure, thereby allowing the gas to flow from the intermediate passage toward the second pressure-regulating chamber through the communication passage, and block a flow of gas in an opposite direction. The communication passage has at least part having a passage cross-sectional area set smaller than a passage cross-sectional area of the intermediate passage.

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First Claim