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? Illustration 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? Illustration 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 unloader mechanisms on reciprocating compressors utilize high-pressure lubricating oil discharged directly from the compressor's lube oil pump as the actuating fluid medium to overcome spring tension and actuate capacity control pistons.