Oil Pump & Regulating Valve

The oil pump constantly supplies oil to all journal bearings, bushings, and crosshead sliding surfaces. The crankshaft drives it by a chain and sprocket to provide adequate oil flow to bearings when the compressor operates at the minimum speed rating (typically half of maximum rated speed).

JG:A:M:N:P:Q:R:J:H:E:K:T:C:D:B:V compressors maintain oil pressure with a spring-loaded safety relief valve within the pump head. To adjust, remove the dust cap to expose the safety relief valve adjustment screw.

JGZ:U and KBZ:U:B:V compressors maintain oil pressure with a separate regulating valve. Ariel sets the spring-loaded safety relief valve within the pump head to about 75 psig (5.2 barg) to prevent high oil pump discharge pressures that could damage the pump. Do not adjust the pump safety relief valve on JGZ:U and KBZ:U:B:V compressors except with a new pump installation.