39
handwheel should be able to rotate about ¾ turn before stopping against
mechanical stop. If not back out setscrew another ¼ turn
25.
Close the operator panel and install the handwheel.
KEEP HANDS AND ARMS CLEAR OF THE VALVE DISC WHEN VALVE IS BEING OPERATED
WITHOUT SUCTION TUBE STRAINER OR SUCTION TUBE IN PLACE.
26.
Cycle the valve to ensure smooth operation.
4.5.3 Relief Valve Component Replacement
If operation of the relief valve indicates that component replacement is necessary, do the follow-
ing:
1.
Remove apparatus from service.
2.
Remove valve handwheel and interferences to open pump compartment cover and gain
access to relief valve.
MALE THREADS ON RELIEF VALVE OUTLET ARE SHARP AND CAN CAUSE SEVERE CUTS.
BE CAREFUL WHEN WORKING AROUND THE EXPOSED THREADS ON THE RELIEF
VALVE OUTLET
3.
Disconnect discharge piping from the relief valve outlet.
THE RELIEF VALVE SPRING IS UNDER PRESSURE AND CAN CAUSE A PROJECTILE HAZ-
ARD. WHEN DISASSEMBLING THE RELIEF VALVE, BACK RELIEF VALVE ADJUSTMENT
SCREW OUT TO LOWEST SETTING TO RELIEVE PRESSURE ON SPRING BEFORE REMOV-
ING RELIEF VALVE HOUSING SCREWS.
4.
Using a 3/16 inch Allen wrench remove the pressure adjustment cap screw locking screw.
5.
Using a 7/8 inch open end wrench, remove the pressure adjustment cap screw to relieve
pressure on the adjustment spring.
6.
Using a ¼ inch Allen wrench remove the four 3/8-16 x 7/8 inch long socket head cap
screws that hold the valve bonnet to the end cap.
7.
Remove the piston, coil spring and tension washer from inside the valve bonnet.
8.
Remove the adjustment bushing from the valve bonnet.
9.
Clean and inspect all components and replace those that are worn.
10.
Install adjustment bushing into valve bonnet and turn in until threaded hole lines up with
hole in bonnet.
11.
Insert tension washer, coil spring and piston into valve bonnet.
12.
Aline valve bonnet on end cap and secure in place using the four 3/8-16 x 7/8 inch long
socket head cap screws. Tighten screws using ¼ inch Allen wrench.
13.
Install pressure adjustment cap screw into the adjustment bushing and tighten until con-
tact with the spring can be felt.
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