Cashco 31-N - Manual (Page 9)

IOM-31-N 9
Possible Cause Remedy
A. Diaphragm failure. A. Replace diaphragm.
B. Downstream over-pressurization. B1.
B2.
B3.
B4.
B5.
Correct process conditions/controls that cause P
2
pressure
to become greater than 50 psig (3.45 Barg).
Install safety relief valve or rupture disc with a 50 psig
(3.45 Barg) setting or lower.
Disassemble actuator assembly and check for bent
upper diaphragm plate. Check for relief cap distortion.
Flow is tightly shutoff downstream of regulator;
relocate shutoff valve.
Seat leakage; replace seat.
C. Body gasket failure. C1. Replace body gasket.
2. External leakage.
Possible Cause Remedy
A. Closing cap removed. A. Reinstall gasketed closing cap.
B. Plug vent. B. Clean vent opening in spring chamber.
3. Unstable Operation.