Patent ID: 7798793

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; and means for lubricating the first ( 200 ) and second ( 202 ) surfaces, wherein: the range is a range of linear translation; the second surface ( 202 ) is in a rotor case ( 48 ); and the means is at least partially formed on a support ( 220 ; 320 ; 420 ; 460 ; 480 ) extending from a downstream face ( 50 ) of said rotor case ( 48 ) into a discharge plenum ( 62 ) and comprises declined edges ( 226 , 228 ; 336 , 338 ; 436 , 438 ) of a sleeve segment extending from a mounting flange.