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. | Replace diaphragm assembly. |
Leakage past valve causing
secondary to increase
somewhat and open relief seat. | 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. | Pull to unlock knob and adjust;
push knob to lock.
Threaded adjusting screws:
loosen lock nut, remove
adjusting screw, clean thread
and lubricate. |
Contaminants in adjusting
screw threads. | Place some lubricant on tip of
screw. |