Page 628 - DixonCatalog20092010

626 DPL410 877.963.4966 • www.dixonvalve.com T
Technical
Simple Regulator Troubleshooting
General Purpose Regulator Malfunction Possible cause Remedy
Regulator creep (increase in
secondary pressure due to leak
from primary)
Won’t relieve secondary
pressure
Won’t reach desired pressure
Excessive leak from relief hole
Regulator chatter
Regulator difficult to adjust
Dirty or cut valve elastomers.
Nick in valve seat.
Non-relieving diaphragm
assembly.
Regulating spring with low
spring rate.
Damaged relief seat. Ruptured
diaphragm.
Leakage past valve causing
secondary to increase
somewhat and open relief seat.
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.
Adjusting screw or knob
locking device in locked
position.
Contaminants in adjusting
screw threads.
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.
If this feature is required,
replace with relieving type
diaphragm assembly.
Use regulating spring with
spring rate designed to cover
desired range.
Replace diaphragm assembly.
Replace or clean valve.
Replace spring with a higher
pressure range spring.
Replace with a piston type
regulator since they have less
tendency to chatter.
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.
Knob
Adjusting
screw
Adjusting
nut Control
spring
Diaphragm
Valve pin
Valve
Valve
spring
Bottom plug
Springrest
Reliefseat