Speedaire 1WD87 Manuel D'utilisation Et Liste De Pièces page 8

Speedaire
Operating Instructions & Parts Manual
Speedaire
Two-Stage Air Compressors
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Operation And Adjustment Of
H
Pilot Valve
The pilot valve is designed to
act as an automatic "on" and
"off" air switch. When in the
"on" position it allows air to
flow from the tank through
the valve to some device such
as a compressor head
unloader mechanism, thus
actuating it. In the "off"
position this valve stops the
flow of air through the valve
and releases the pressure in
the line to the device.
The pilot valve works as
follows: Tank air pressure acts
on the bottom of the valve.
When pressure is great
enough to overcome spring
force holding valve down on
lower seat, it lifts off seat and
allows air to flow around
valve and out through side
opening in pilot valve. When
valve lifts off lower seat it
moves up and seats on upper
seat where it is held by tank
pressure. When pressure in
tank and on valve drops,
spring forces valve back down
For Service and Warranty, Call: 1-888-303-1344.
®
10 & 15 HP
on lower seat. Air in line to
device being actuated can
then escape through upper
seat and out vent hole. The
pressure at which the pilot
valve is "on" or "off" is
controlled by the spring which
has been installed at the
factory. A small adjustment
can be made in the field by
changing the spring force by
compressing the spring more
or less with the adjusting
screw provided on the pilot
valve.
Compressor Pilot Valve
Pressure Adjustment
Proceed with the following
instructions while compressor
is running:
1. Loosen locknut (4) and
back off several turns. Do
not turn differential
adjuster (3).
2. Check reading on the tank
pressure gauge. Set the
compressor maximum
pressure at 170 psig. Turn
threaded cap (1) clockwise
to increase pressure or
counterclockwise to
decrease pressure.
B980-B
(Ref. Drawing)
3. After pressure is set,
tighten locknut (4). Be
careful not to move the
threaded cap (1).
Compressor Pilot Valve
Differential Pressure
Adjustment
Proceed with the following
instructions while compressor is
running:
1. Loosen locknut (2) and
back off several turns.
2. Check reading on the tank
pressure gauge. Set the
pressure to 30 psig
differential (unload at 170
psig, reload at 140 psig).
Turn nut (3) clockwise to
increase differential
pressure or counterclockwise
to decrease differential
pressure.
3. After pressure is set, tighten
locknut (2). Be careful not to
move nut (3).
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1WD87, 1WD88, 1WD90