| 摘要 |
PROBLEM TO BE SOLVED: To provide an expander capable of accurately controlling inlet pressure of the expander in maximally high pressure in a pressure-proof limit or less.SOLUTION: An ECU 8 controls sub-suction port valves 32a and 32b so that a detecting value P by a pressure sensor S1 coincides with target pressure Pset in the ECU 8. When the detecting value P is larger than the target pressure Pwhen both the sub-suction port valves 32a and 32b are a full closure state, the ECU 8 opens only the sub-suction port valve 32a and gradually increases its opening. When the detecting value P is larger than the target pressure Peven when the sub-suction port valve 32a fully opens, the ECU 8 also opens the sub-suction port valve 32b, and gradually increases its opening. To the contrary, when the detecting value P reduces and is smaller than the target pressure Pin a state of opening the sub-suction port valve 32a in optional opening, the ECU 8 gradually reduces the opening of the sub-suction port valve 32a. |
