Lubricating oil pressure control apparatus for unloading compressors

Claim 1

A FLUID COMPRESSOR UNLOADER MECHANISM CONVERSION KIT FOR A FLUID COMPRESSOR HAVING A CASING PROVIDING A CRANKCASE CHAMBER AND A COMPRESSING CHAMBBER, SAID CASING HAVING A CYLINDER WALL THROUGH WHICH A PASSAGEWAY EXTENDS FROM THE DISCHARGE END OF THE COMPRESSING CHAMBER TO THE EXTERIOR OF THE CYLINDER WALL, A CRANKSHAFT ROTATABLE IN SAID CRANKCASE, AND APUMP OPERATED BY THE CRANKSHAFT FOR SUPPLYING HYDRAULIC FLUID LUBRICANT UNDER PRESSSURE TO THE BEARINGS OF THE COMPRESSOR, SAID CONVERSION KIT COMPRISING: (A) A PUMP PISTON CYLINDER HAVING A CHAMBER FOR RECEIVING HYDRAULIC LUBRICANT UNDER PRESSURE, AND A HOLLOW BOSS THROUGH WHICH HYDRAULIC LUBRICANT CAN BE DISCHARGED FROM THE CHAMBER, (B) AN ADAPTER FILLING HAVING AN O-RING SEAL FOR ENCIRCLING THE HOLLOW BOSS TO FORM A ROTARY SEAL THEREWITH, (C) A HYDRAULIC FLUID LUBRICANT PRESSURE OPERATED UNLOADER VALVE DEVICE PROVIDED WITH MEANS WHEREBY IT CAN BE SECURED TO THE CYLINDER WALL AT THE EXTERIOR END OF THE PASSAGEWAY THROUGH THE CYLINDER WALL, AND (D) CONDUIT MEANS FOR CONNECTING SAID ADAPTER FITTING TO SAID HYDRAULIC FLUID LUBRICANT PRESSUURE OPERATED UNLOADER VALVE DEVICE WHEREBY SAID UNLOADER VALVE DEVICE IS OPERATED BY VARIATIONS IN THE PRESSURE OFF HYDRAULIC FLUID LUBRICANT SUPPLIED BY THE PUMMP TO THE BEARINGS OF THE COMPRESSOR.