13-21-603 Page 32
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.
Figure 4-5 – INLET VALVE
Inlet Valve
, Figure 1-4 page 11 and Figure 4-5, page 32) - The Inlet valve restricts the inlet to control
delivery and closes to unload the compressor. At shutdown, the inlet valve closes to prevent the back
flow of air.
The inlet valve position is controlled by air pressure in its piston cylinder, which is controlled by the
“AirSmart” Controller through solenoid valves IVC and IVO. As Pressure to the piston is increased, the
valve closes to restrict air flow and compressor delivery.
224ECM797-B
(Ref. Drawing)
