Patent ID: 6823686
Filing Date: 2004-11-30
Classification: F04B,F04C,F25B

Abstract:
A system to equalize fluid pressure in a compressor having a first portion at a first pressure and a second portion at a second pressure greater than the first pressure, the system comprising:a housing, the housing comprising: a first inlet for a fluid, the first inlet for the fluid being in fluid communication with the second portion of the compressor; a second inlet for the fluid, the second inlet for the fluid being in fluid communication with the second portion of a compressor; a first outlet for the fluid, the first outlet for the fluid being configured to permit flow of the fluid from the system; and a second outlet for the fluid, the second outlet for the fluid being in fluid communication with the first portion of the compressor; a chamber disposed within the housing, the chamber being in fluid communication with the first inlet, the second inlet, the first outlet and the second outlet; a piston slidably disposed within the chamber between a first position and a second position, wherein the first inlet and the first outlet are in fluid communication upon the piston being in the first position and the second inlet and the second outlet are in fluid communication upon the piston being in the second position; means for moving the piston in the chamber between the first position and the second position; and wherein the means for moving the piston in the chamber positions the piston in the second position in response to the compressor not being in operation, thereby permitting the fluid at the second pressure to flow through the second outlet to the first portion of the compressor to equalize pressure in the compressor.