Figure 4-4 - Inlet Valve - Gardner Denver AUTOSENTRY EAQ99Q Operating And Service Manual

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.
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.
208EDM797-A
(Ref. Drawing)
Inlet Valve (Figure 1-4, page 11 and Figure 4-4) - 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
"AutoSentry" Controller through solenoid valves IVC and IVO. As Pressure to the piston is increased, the
valve closes to restrict air flow and compressor delivery.
Figure 4-4 – INLET VALVE
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