The fluid used as a source of actuating power against the underside of the unloader power element piston of the refrigeration compressor capacity control mechanism illustrated is obtained from where? GS-RA-13

Illustration GS-RA-13: the U.S. Coast Guard has not released this illustration.

Question

The fluid used as a source of actuating power against the underside of the unloader power element piston of the refrigeration compressor capacity control mechanism illustrated is obtained from where? GS-RA-13

Illustration GS-RA-13: the U.S. Coast Guard has not released this illustration.

Accepted Answer

Option A: discharge of the compressor lube oil pump. Hydraulic actuation pressure for unloading compressor cylinders is derived directly from the forced-feed lubrication pump discharge. Using clean, pressurized lube oil provides the necessary mechanical force to lift suction valve unloader fingers against internal cylinder pressure.