Guide on how to replace the vacuum pump relief valve on 5HP pumps.
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Tools and Supplies:
● Adjustable wrench
● Shop towels
● Loctite 567 pipe sealant or Teflon tape
●5/8″ wrench
1. Turn off the air, water, and power at the source and machine.
Note: The Relief Valve threads into an adapter, leave the adapter in the vacuum pump.
Unscrew the relief from the pump.
Apply Pipe sealant or Teflon tape to seal the new relief valve.
Screw in the new relief.
Loosen the jam nut.
Turn the cap counterclockwise until 6 threads are visible beyond the jam nut.
Turn on the air, water, and power at the source and machine.
Turn the vacuum pump on and confirm a vacuum seal: the regulator should read 10 psi or 3 gallons per minute from vacuum pump discharge.
If a “hissing” noise is audible, continue to step 10. If a hissing noise is inaudible, turn the cap of the relief counterclockwise until it is.
Close the ball valve at the vacuum inlet leading to the pump (located above the relief valve).
Turn the cap clockwise until you hear a crackling or grinding noise. Turn counterclockwise until the noise is gone, then complete another half turn.
Note: When the relief valve is set correctly, you may hear a rattling noise from the valve
Once set, tighten the jam nut.
Open the ball valve at the vacuum inlet. Confirm the Vacuum is within normal operating range.
