Patent ID: 8079837

Claim:
A compressor having a region of pressure intermediate between discharge pressure and suction pressure characterized in that a valve mechanism is provided for introducing discharge gas into said region of intermediate pressure so as to render constant a pressure difference between intermediate pressure and suction pressure; wherein said valve mechanism comprises an intermediate pressure introducing path communicating with said region of intermediate pressure, a suction pressure introducing path communicating with a region of suction pressure, a discharge gas introducing path capable of introducing discharge gas, a valve body having an intermediate pressure sensitive surface sensing intermediate pressure introduced from said intermediate pressure introducing path and a suction pressure sensitive surface sensing suction pressure introduced from said suction pressure introducing path on respective sides in a movement direction and having therein a communication path capable of communicating said intermediate pressure introducing path and said discharge gas introducing path with each other by movement, and a spring capable of giving a force corresponding to said constant pressure difference to said valve body.