Patent ID: 8021134

Claim:
A compressor apparatus ( 20 ) comprising: a housing ( 22 ) having first ( 53 ) and second ( 58 ) ports along a flow path; one or more working elements ( 26 ; 28 ) cooperating with the housing to define a compression path between suction ( 60 ) and discharge ( 62 ) locations along the flow path; an unloading slide valve ( 100 ) having: a valve element ( 102 ) having a range between a first condition and a second condition, the second condition being unloaded relative to the first condition, a first surface ( 200 ) of the valve element ( 102 ) in sliding engagement with a second surface ( 202 ) of the housing ( 22 ) during movement between the first and second conditions; a cylinder ( 128 ) formed in a slide case ( 130 ; a piston ( 124 ) mounted within the cylinder; and a shaft ( 122 ) coupling the valve element to the piston, characterized by: a bearing ( 132 ) mounted to the housing and guiding the shaft ( 122 ).