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Idiomas disponibles
Idiomas disponibles
Operator Controls
The operator controls for the operation of the
gasoline compressor outfit are located between the
compressor pump and gasoline engine.
Unloader Valve
The unloader is used because frequent start-ups and
stops are impractical with a gasoline engine. The
unloader valve is preset at the factory. Never attempt
to make adjustments to the unloader valve.
Pressure loads beyond the design limits
may cause tank rupture or explosion. Do
not attempt to adjust, remove, or defeat
the unloader valve, or change and modify
any pressure control device. If replace-
ment is necessary, the same rated valve
must be used.
Figure 3. Unloader Valve
The unloader valve, Figure 3, is controlled by tank pres-
sure. Compressors with unloaders run continuously
and maintain air pressure within set limits. At maxi-
mum tank pressure the unloader valve opens and the
OPERATION
compressed air is exhausted to the atmosphere. This
prevents the compressor from continually building more
pressure if air is not needed. When the tank pressure
drops to a predetermined minimum pressure, the
unloader valve closes and the compressor again builds
up the tank pressure. Pressure continues to build until
maximum tank pressure is achieved. The cycle then
repeats itself.
The toggle lever at the top of the unloader valve should
be placed in the straight up or vertical position when
starting up the compressor. This prevents the com-
pressor from starting under load. Once the engine has
reached full throttle, the lever should be returned to the
horizontal position to allow the compressor pump to
build compressed air in the air tank.
Over-pressurization of the air tank may
cause tank rupture or explosion. The air
tank is protected from over-pressurization
by a safety valve. Do not eliminate, make
adjustments or subsitutions to this device.
Occasionally pull the ring on the safety
valve to make sure it operates freely, if not
it must be replaced. Intercooler safety
valves used on two stage outfits must be
similarly checked.
The safety valve, is set at the factory at a pressure
approximately 15 pounds higher than the rated pres-
sure of the outfit. If the unloader valve malfunctions and
does not exhaust compressed air automatically at maxi-
mum tank pressure, the safety valve will protect the air
tank against excessive air pressure by popping off at
its preset pressure.
Two stage compressors with unloader controls will have
a safety valve on the intercooler, set approximately 50
to 55 pounds. The purpose of this safety valve is to
prevent the full tank pressure building up in the large,
low pressure cylinder or intercooler.
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