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13-21-615 v01 Page 35
Oil Level Gauge
(Figure 1-6, page 11) This gauge is located on the oil reservoir and indicates the oil
level. See Section 5 for information on how to correctly read the gauge and proper lubrication.
FIGURE 4-3 MINIMUM DISCHARGE PRESSURE/CHECK VALVE
Minimum Discharge Pressure/Check Valve
(Figure 4-3) An internal spring-loaded minimum pressure
valve is used in the final discharge line to provide a positive pressure on the coolant system of the
compressor even if the air service valve is fully open to atmospheric pressure. This valve also functions as
a check valve to prevent back flow of air from the shop air line when the unit stops, unloads, or is shut
down.
The valve incorporates a spring-loaded piston which maintains approximately 65 psig in the oil reservoir.
When the air pressure on the upstream (reservoir) side of the valve rises above 65 psig, the spring is
overridden and the valve opens to full porting.
The valve does not require maintenance or adjustment. If the valve fails to function, check the valve stem
O-ring for sealing, valve orifices for restriction, or valve and valve seat for burrs and dirt.
The valve is adjustable within a small range. It is adjusted by a screw on the side of the valve. By turning
the screw, the minimum pressure to open the valve increases. Conversely, backing it out decreases the
minimum pressure required to open the valve.
To service the valve, make sure all pressure is relieved, disconnect the unit from the power supply, lockout
and tagout, then unscrew the valve cap from the body. The internal parts will come out after the cap has
been removed. Repair kits are available from your local authorized Gardner Denver distributor.