31 - 1
Pressure Regulator
Off-load Air Pressure Regulation
The pressure control system fitted to these machines
operates over a range of approximately 1 bar (15 Ibf/in
2
), so
that the off-load air pressure (unloader valve shut, engine
idling) is approximately 1 bar higher than the full-load
pressure (unloader valve wide open, engine at maximum
speed).
The normal off-load air pressure is 6.9 bar (100 Ibf /in
2
), and
machines leaving the factory are set at this figure.
Checking Safety Valve Setting
The pressure regulator is used to check the setting of the
safety valve A (refer also to page A/5-10).
With the plant running and the air delivery cocks closed,
release the locknut 2 and turn the pressure regulator
adjusting screw 1 clockwise to raise the off-load air
pressure. BEWARE OF ESCAPING AIR/OIL MIXTURE.
The safety valve should operate at 7.7 to 8.2bar (113 to
120Ib/in
2
).
Reset the off-load air pressure to 6.9bar (100Ib/in
2
) on
completion.
Section A
Attachments
9803/7130
Section A
31 - 1
Issue 1
Airmaster Compressor
S212030
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