| 摘要 |
PROBLEM TO BE SOLVED: To keep specified temperature of a regulator irrespective of difference of gas pressure across the regulator, prevent temperature reduction due to an adiabatic expansion, and prevent reduction of the mass flow amount due to excessive temperature rise of fuel gas. SOLUTION: A cooling water flow amount control valve 14 is arranged for reducing a flow amount of cooling water (hot water) of a water passage 12 correspondingly to reduction of gas pressure on the side of a gas cylinder 8. When the gas pressure on the side of the gas cylinder 8 is reduced and the temperature of a regulator 10 is not decreased, supply of the cooling water (hot water) to the regulator 10 is restricted for preventing excessive temperature rise of the regulator 10. The temperature of the regulator 10 is kept at a specified value irrespective of difference of the gas pressure across the regulator 10, for preventing temperature reduction of an adiabatic expansion. Reduction of mass flow amount is also prevented, which may be caused by excessive temperature rise of fuel gas.
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