Relief Valves
CONDITION CAUSE REMEDY
CAN’T GET PRESSURE Poppet stuck open or dirt
under seal
Check for foreign matter
between poppets and their
mating members. Members
must slide freely
ERRATIC PRESSURE Poppet seal damaged Replace damaged parts.
Clean dirt and remove
surface marks for free
movement
PRESSURE SETTING NOT
CORRECT
Wear due to dirt. Lock nut
adj. screw loose
See section on “Valve
Adjustments”.
LEAK Damaged seats, worn “O”
rings, parts sticking due to dirt
Replace worn or damaged
parts. Inspect for free
movement of components.
Check seats for scratches,
nicks, or other marks.
227REVISED:
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