| 摘要 |
A refrigerating cycle composed of a compressor, a condenser, a pressure differential valve, a throttle, an evaporator and a check valve. The check valve is connected back to the compressor. The above mentioned pressure differential valve is divided into a valve section and a control section. The control section is further divided into two chambers by a diaphragm. Two pressure introducing tubes are connected to the pipe on the respective sides of the check valve. During operation of the refrigerating system, low pressure prevails on both side of the check valve. However, stoppage of the rotary compressor causes a high pressure refrigerant leak on the suction side thereof with the result that the high pressure refrigerant is introduced into the one of the chambers of the control section while the other pressure introducing tube on the other side of the check valve provides low pressure communication with the other chamber. Using this pressure difference, the valve section is operated by an actuator rod to close the valve, thus maintaining high pressure between the compressor and differential valve to reducing a load in resuming the operation.
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