VMAC - Vehicle Mounted Air Compressors
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VMAC Knowledge Base: kb.vmacair.com
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The pressure regulator is adjusted to limit maximum air pressure to a safe level.
As air pressure and flow are related, this adjustment is also very important for
optimum performance.
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Install the test tool in the tank outlet with the ball valve closed.
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Ensure that the oil level is correct and the system is at operating temperature.
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Operate the system until it reaches full pressure. Observe the pressure on the
gauge.
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Loosen the lock nut on the regulator (Figure 54).
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Pressure can be adjusted within a range of 145 psi (999.7 kPa) – 175 psi (1205 kPa),
dependent upon requirements.
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Rotate the setting bolt clockwise to increase pressure. Rotate counter clockwise
to decrease pressure. Tighten the lock nut once adjustments are complete.
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Open the ball valve to allow air to flow and the pressure to drop. Close the
valve and observe the pressure to ensure that the adjustment is correct.
Prolonged operation above 175 psi / 1205 kPa may damage the
pressure regulator.
Never adjust the pressure regulator to exceed 175 psi (1205 kPa).
At 200 psi (1379 kPa), the pressure relief valve at the AOST will
activate, resulting in rapid air loss, which may cause component
damage, injury or death.
Figure 54 — Air regulator
Setting bolt
Lock nut
Bleed hole
Regulated
pressure
System
pressure
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Test the system after any adjustments are made to verify it is operating properly.
Adjusting the Pressure Regulator
