VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: kb.vmacair.com
53
Inspecting and Replacing the Pressure Relief Valve
Read the “Maintenance and Repair Safety” section prior to
performing any work on the system (beginning on page 47).
Wear appropriate Personal Protective Equipment and follow all
industry standard safety practices.
The Pressure Relief Valve is a regular service item, and must be replaced every 400
hours or 1 year, whichever interval occurs first.
Inspect the pressure relief valve for signs of corrosion or loss of functionality. To
test the pressure relief valve functionality:
☐
Visually inspect the valve and ensure it is not corroded and that the vent holes
are not plugged.
☐
Turn the system on and allow it reach full system pressure (factory setting
140 psi).
☐
Ensure that air does not leak out of the valve. Air leaking from the pressure
relief valve when system pressure is at or below 140 psi indicates that the
spring in the valve is worn and the valve must be replaced.
☐
If the pressure relief valve is showing loss of functionality, contact a local VMAC
dealer for a replacement.
A replacement pressure relief valve is included with the VMAC 400
hour service kit.
Figure 29 — Pressure relief valve
200 psi
pressure relief
valve
Do not use the pressure relief valve as a means of depressurizing
the compressor system. Doing so will prematurely wear the internal
spring or the seat, preventing the valve from maintaining normal
system pressure.
