DeVillbiss Air Power Company SP-100-F Troubleshooting Guide download pdf (Page 11)

OPERATION

Operator Controls

The unloader valve for the operation of the gasoline

compressor outfit is located between the compressor

pump and gasoline engine. The air discharge valve

can be located on the end of the air tank. The safety

valve and pressure gauge are attached to the tank

below the unloader. See page 7.

Unloader Valve

The unloader valve,Figure 6, iscontrolledbytankpres-

sure. Compressors with unloaders run continuously

and maintain air pressure within set limits. At maxi-

mumtank pressurethe unloadervalveopens andthe

compressed air is exhausted to atmosphere. This

preventsthecompressorfrom continuallybuildingmore

pressureif airis not needed. When the tankpressure

drops to a predetermined minimum pressure, the

unloadervalveclosesandthecompressoragainbuilds

upthe tank pressure. Pressurecontinuesto buildun-

til maximum tank pressure is achieved. The cycle

then repeats itself.

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.

The unloader isused because frequent start-upsand

stops are impractical with a gasoline engine. The

unloadervalve ispreset at thefactory. Never attempt

to make adjustments to the unloader valve.

The toggle leveronthefront of the unloadervalveshould

be pulled outor inthe horizontalposition when start-

ing upthe compressor. This prevents the compressor

from starting under load. Once the engine has reached

full throttle, the lever should be pushed to the side,

returning it to its original position to allow the com-

pressor pump to build pressure in the air tank.

Toggle

Lever

Figure 6. Unloader Valve

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DeVillbiss Air Power Company SP-100-F Troubleshooting Guide Page 11

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