Gardner Denver ELECTRA-SAVER EAYQ E, Operating And Service Manual

Page: 41 / 75

13–10–613 SP Page 32
FIGURE 4–5 – MINIMUM DISCHARGE PRESSURE /
CHECK VALVE
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 ad-
justed by a screw on the side of the valve. By turning
the screw, the minimum pressure to open the valve in-
creases. Conversely, backing it out decreases the
minimum pressure required to open the valve.
To service the valve, 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 Machinery distributor.
Inlet Valve (FIGURE 1–4, page 3, and FIGURE 4–6)
– 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 “Auto
Sentry–ES+” through solenoid valves IVC and IVO. As
Pressure to the piston is increased, the valve closes to
restrict air flow and compressor delivery.
Solenoid Valves IVC and IVO – These valves control
position of the inlet valve in response to signals from
the “Auto Sentry
–ES+”. With both valves de–ener-
gized, the normally open IVC valve allows control pres-
sure to the inlet piston to close the valve. If IVC only
is energized, the inlet valve is held in its current posi-
FIGURE 4–6 – INLET VALVE
203EAY797
(Ref. Drawing)