Patent ID: 8641395

Claim:
A compressor comprising: an intake passage, a compression mechanism and an outlet passage in fluid communication; the compression mechanism being configured and positioned to receive a vapor from the intake passage and to provide vapor at a higher pressure to the outlet passage, the compression mechanism comprising a member, the member being configured and positioned to counteract axial forces generated in the compression mechanism; a first valve configured and positioned to adjust compressor capacity, the first valve comprising a valve body forming a portion of a housing for the compression mechanism, the valve body being positionable in a first position relative to the outlet passage to provide a first output capacity for the compressor and the valve body being positionable in a second position relative to the outlet passage to provide a second output capacity for the compressor, the first output capacity being greater than the second output capacity; a fluid source storing a fluid at a first pressure, the fluid source being separate from both the intake passage and the outlet passage; a first connection between the fluid source and the member to provide fluid from the fluid source at the first pressure to the member; a second connection between the fluid source and the member to provide fluid from the fluid source at a second pressure to the member, the second pressure being less than the first pressure; a second valve positioned in the first connection to control fluid flow in the first connection, the second valve comprising the valve body and a slot in the valve body, the second valve having a first position to permit fluid flow in the slot and the first connection and a second position to prevent fluid flow in the slot and the first connection; and a fluid pressure from the fluid source being applied to the member to generate an axial force to counteract axial forces generated in the compression mechanism.