3-3.
ISOLATE A NONADJUSTABLE PRESSURE RELIEF VALVE MALFUNCTION
When you are performing the nonadjustable pressure relief valve "pop-off" test,
the nonadjustable pressure relief valve may stick or operate intermittently. If this
happens, you must trouble-shoot for the malfunction. Refer to figure 3-3.
CAUTION:
No repair should ever be undertaken or attempted by anyone who is not
trained in repairing devices of this nature.
Figure 3-3. Control head.
a. Place a small screwdriver through one of the vent holes and carefully attempt
to un-stick the valve.
b. Disassemble the valve for cleaning and repair if the valve continues to stick or
operate intermittently.
(1) Disassemble the pressure relief valve. Inspect the parts for wear and/or
damage during disassembly.
(a) Remove the Tru-arc retaining ring.
(b) Remove the cap.
(c)
Remove the compression spring.
(d) Remove the pressure relief valve stem.
(e) Remove the pressure relief valve body.
(f)
Remove the gasket.
MD0353
3-5