/
.,/
Cv AS
O-RI N
SEMBL
G
Y
FIGURE 4-3- BLOWDOWN VALVE
sure for protection against over pressure. Periodic
checks should be made to ensure its (their) operation.
The relief valve should be tested for proper operation
at least once every year. To test the relief valve, raise
the system operating pressure to 75% ofthe relief valve
set pressure and manually open the valve with the hand
lever. Hold the valve open for a few seconds and allow
it to snap shut,
wARNING
When the relief valve opens, a stream
of high velocity air is released, result-
ing in a high noise level and possible
discharge of accumulated dirt or oth-
er debris. Always wear eye and ear
protection and stand clear of the dis-
charge port when testing the relief
valve to prevent injury.
I
~CAUTION
I
I
Never paint, lubricate or alter a relief
I
I valve. Do not plug vent or restrict dis- I
I
charge.
I
MAIN SPRING
CV SPRING
/
FIGURE 4-4- MINIMUM DISCHARGE PRESSURE /
CHECK VALVE
~WARNING
Operation of unit with improper relief
valve setting can result in severe per-
sonal injury or machine damage.
Insure properly set valves are in-
stalled and maintained.
Blowdown Valve (FIGURE 4-3) - This valve normal-
ly is used for control functions, but also serves to relieve
reservoir pressure following a shutdown. The blow-
down valve is a two-way solenoid valve which is piped
into the oil reservoir outlet ahead of the minimum pres-
sure valve, When the solenoid is de-energized, the
valve opens and the coolant system is blown down.
When the solenoid is energized, the valve closes to al-
low the coolant system to pressurize. A control air
check valve is provided to ensure that the inlet valve is
closed during blowdown.
Oil Level Gauge (FIGURE 1-6, Section 1, page 3) -
This gauge is located on the oil reservoir and indicates
the oil level. See section 5 for information on how to
correctly read the gauge and proper lubrication.
Minimum
Discharge Pressure/Check Valve
(FIGURE 4-4) - An internal spring-loaded minimum
pressure valve is used in the final discharge line to pro-
vide a positive pressure on the coolant system of the
compressor even if the air service valve is fully open to
13-9/1
0-641 Page 28
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