Gardner Denver ELECTRA-SAVER EAY, Operating And Service Manual

Page: 28 / 55

13–10–613 Page 20
FIGURE 4–3 – MINIMUM DISCHARGE PRESSURE /
CHECK VALVE
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 overrid-
den 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 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 4–4,
page 20) – The Inlet valve restricts the inlet to control
delivery and closes to unload the compressor. At shut-
down, 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
” 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
203EAY797–B
(Ref Drawing)