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Technical Information
DPL116
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dixonvalve.comW
847
Simple Regulator Troubleshooting
General Purpose Regulator
Knob
Adjusting
screw
Adjusting
nut
Control
spring
Diaphragm
Valve pin
Valve
Valve
spring
Bottom plug
Spring
rest
Relief
seat
Malfunction
Possible cause
Remedy
Regulator creep (increase in
secondary pressure due to
leak from primary)
Dirty or cut valve elastomers.
Nick in valve seat.
Replace or clean valve.
If body or valve seat is
damaged it can be replaced
on some models. On others
replacement of complete
regulator is required.
Won’t relieve secondary
pressure
Non-relieving diaphragm
assembly.
If this feature is required,
replace with relieving type
diaphragm assembly.
Won’t reach desired pressure
Regulating spring with low
spring rate.
Use regulating spring with
spring rate designed to cover
desired range.
Excessive leak from relief
hole
Damaged relief seat.
Ruptured
diaphragm.
Leakage past valve causing
secondary to increase
somewhat and open relief
seat.
Replace diaphragm
assembly.
Replace or clean valve.
Regulator chatter
A resonant condition is
generally
only encountered under a
certain set of conditions of
flow and pressure and then
only in some applications in
which regulator couples with
other system components.
Replace spring with a higher
pressure range spring.
Replace with a piston type
regulator since they have
less tendency to chatter.
Regulator difficult to adjust
Adjusting screw or knob
locking device in locked
position.
Contaminants in adjusting
screw threads.
Pull to unlock knob and
adjust; push knob to lock.
Threaded adjusting screws:
loosen lock nut, remove
adjusting screw, clean thread
and lubricate.
Place some lubricant on tip
of screw.