PR-7ULF Series Pressure Regulator Diaphragm

PR-7ULF Series Pressure Regulator
Diaphragm Replacement Instructions
Make sure you thoroughly understand these directions before proceeding
MAKE SURE THE REGULATOR IS DISCONNECTED FROM AIR SOURCE
MAKE SURE ANY RESIDUAL PRESSURE IS BLED OFF FROM REGULATOR.
Instructions
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13.
Completely read these instructions before
performing any of the operations.
Make sure the regulator is disconnected
from pressure source; make sure any residual
pressure is bled off from the regulator.
FAILURE TO DO THIS WILL RESULT IN
SERIOUS PERSONAL INJURY. DO NOT
PROCEED UNTIL PRESSURE HAS BEEN
REMOVED AND/OR TERMINATED
Securely clamp the regulator over the flats in
a vise.
Turn the knob counterclockwise as far as it
will go.
Remove the cap and adjusting screw as a
unit. The diaphragm will probably remain in
the cap when it is removed. The range spring
will be securely held inside the cap if this unit
is equipped with a spring stabilizer. Earlier
models do not have a stabilizer, in which case
the range spring will come out when the
diaphragm is removed.
If the diaphragm assembly remained in the
cap you will have to rotate the adjusting
screw clockwise to force it out. Gently rock
the diaphragm assembly back and forth while
turning the adjusting screw. This will facilitate
the removal of the diaphragm assembly.
Place new diaphragm assembly onto the
nose of the regulator. DO NOT insert a new
diaphragm assembly back into the cap assembly.
Place range spring and spring button onto diaphragm assembly unless it was equipped with a stabilizer and is
inside the cap.
Place a small amount of Krytox or other lubricant on the outer threads of the body if the regulator body is steel.
Do not apply lubricant to threads if regulator body is brass.
Put the cap over the regulator and engage threads by hand. Tighten hand tight.
Finish tightening cap to 60 lbf•ft (81 N•m). (40 lbf•ft (54 N•m) with Viton diaphragm).
Attach a pressure gauge and quarter-turn valve to the outlet port. Leave the valve in the open position.
Use a 5/32” Allen wrench and slowly turn adjusting screw clockwise. When there is evidence of flow at the quarterturn valve close it.
14. Squirt a leak detecting fluid around the base of the cap where it meets the body. Agitate the fluid to form foam
and apply around the 0.125 (3.1mm) leak detection port in the bonnet of the cap.
15. Slowly continue turning the adjusting screw while watching and listening for any leaks. It may be necessary to reapply the liquid. If leaks are noticed, immediately back off adjusting screw and repair unit as needed.
16. If no leaks are noticed, adjust control pressure to a value that is 110% of the maximum rating for this regulator.
Reapply the leak detecting fluid as needed.
17. Note the pressure reading on the gauge. Wait for 5 minutes. Increasing pressure indicates a leak across the seat or
flat seal. Decreasing pressure indicates a possible diaphragm leak. If the pressure does not remain stable, the unit
must be disassembled and the cause of leakage repaired.
18. Relieve the outlet pressure while backing off on the adjusting knob. Continue backing off on adjustment knob
until it is all the way out and will turn no further.
19. The regulator is now ready for service.
GO Regulator
405 Centura Court • PO Box 4866 • Spartanburg, SC 29303
Phone (864) 574-7966 • Fax (864) 574-5608
www.goreg.com • sales@goreg.com
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