Section 2
DESCRIPTION
10
bar] on ["HH"] compressors, 175 psig [12.0 bar]
["XH"]. Supervisor II energizes the solenoid valve
and allows the blowdown valve to close. The re-
energized solenoid valve again prevents line pres-
sure from reaching the inlet control valve. Should
the pressure begin to rise, the pressure regulator
will resume its normal function as previously
described.
START - 0 TO 50 PSIG (0 TO 3.5 BAR)
When the compressor START button is depressed,
the sump pressure will quickly rise from 0 to 50 psig
(0 to 3.5 bar). During this period both the pressure
regulator and the solenoid valve are closed, the
inlet valve is fully open due to inlet air flow, and the
compressor pumps at full rated capacity. The rising
compressor air pressure is isolated from the serv-
ice line in this phase by the minimum pressure
valve, set at approximately 50 psig (3.5 bar).
NORMAL OPERATING MODE - 50 TO 125 PSIG
(3.5 TO 8.6 BAR )
When the pressure air rises above 50 psig (3.5
bar), the minimum pressure/check valve opens and
Figure 2-4 Control System
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