Cashco 3171 - Manual (Page 5)

IOM-3171 5
SECTION VII
VII. TROUBLE SHOOTING GUIDE
1. Erratic operation; chattering.
Possible Cause Remedy
A. Oversized regulator. A1. Check actual fl ow conditions, re-size regulator for minimum and
maximum fl ow.
A2. Increase fl ow rate.
A3. Decrease regulator pressure drop; decrease inlet pressure by
placing a throttling orifi ce in inlet piping union.
A4. Install next step higher range spring. Contact factory.
A5. Before replacing regulator, contact factory.
B. Worn piston; inadequate guiding. B. Replace regulator.
Possible Cause Remedy
A. Regulator undersized. A1. Confi rm by opening bypass valve together with regulator.
A2. Check actual fl ow conditions, re-size regulator; if regulator has
inadequate capacity, replace with larger unit.
B. Incorrect range spring (screwing out CCW of
adjusting screw does not allow bringing pressure
level to proper level. B. Replace range spring with proper lower range. Contact fac-
tory.
C. Too much rise (build). C1 Review rise (build) expected.
C2. Contact factory.
2. Regulator inlet (upstream) too high:
Possible Cause Remedy
A. Normal-life diaphragm failure. A. Replace diaphragm.
B. Abnormal short-life diaphragm failure. B1. Can be caused by excessive chattering. See No. 1. to remedy
chatter.
B2. Can be caused by corrosive action. Consider alternate dia-
phragm material.
B3. For composition diaphragms, ensure not subjecting to over-
temperature conditions.
B4. Upstream (inlet) pressure build-up occuring that overstresses
diaphragms. Relocate regulator or protect with safety relief
valve.
C. O-ring failure. C. Replace O-ring (15), apply appropriate torque.
3. Leakage through the spring chamber vent hole.
Possible Cause Remedy
A. Plugged spring chamber vent. A. Clean vent opening.
B. Fluid too viscous. B. Heat fl uid. Contact factory.
4. Sluggish operation.