APPENDIX B : COMPRESSOR DRIVEN AIRDRYER
B--34 20950 Issue 1 April 98
Pressure Relief Valve Cleaning,Checking or Adjusting
WARNING: The airdryer must be switched off and power
removed.
Note: Airdryer Test Kit 30455 is required for these procedures
Cleaning the PRV
Note: Thread sealant(Loctite542withActivator7941)will be required.
Lock Screw
Insert
‘O’ Ring
Poppet
Spring
Body
Direction of air flow
PRV Removal
TP7222--4
Tube
Connector
(1) With the Mains isolator off and the door open, cut the ty--rap
securing the PRV, and unscrew the nuts to disconnect the tubes.
(2) Remove theelbowsfromthePRV,makinga noteof theorientation
of the PRV.
(3) TofitanewPRV,applythreadsealanttotheinletendthreadsofthe
PRV,andscrewtothecorrectelbow,asnotedinstep2. Nowfollow
the adjustment procedure on page B--35.
To clean the PRV,
(4) With the PRV removed, find the arrow indicating the air flow
direction, the arrow points to the adjustment end.
(5) At the opposite end to the adjustment (the inlet end), use a 5/16”
hexagon key to remove the lock screw.
(6) Removetheinsert(carryingthesealingO’ring),poppetandspring
(7) Clean all parts of the PRV, then refit into the PRV body, tightenthe
locking screw.
(8) Refit the PRV as in step 3.
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