Cashco 2171 - Manual (Page 5)

IOM-1171/2171 5
SECTION VII
2. Regulator inlet (upstream) too high:
VII. TROUBLE SHOOTING GUIDE
1. Erratic operation; chattering.
3. Leakage through the spring chamber vent hole.
4. Sluggish operation.
Possible Causes Remedies
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 plac-
ing 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 Causes Remedies
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 in CW of adjusting
screw does not allow bringing pressure level up to
proper level.
B. Replace range spring with proper lower range.
B.2 Contact factory.
C. Too much rise (build). C1. Review rise (build) expected.
C2. Contact factory.
Possible Causes Remedies
A. Normal-life diaphragm failure. A1. 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 diaphragm
material.
B3. For composition diaphragms, ensure not subjecting to over tem-
perature conditions.
B4. Upstream (inlet) pressure build-up occurring that overstresses dia-
phragms. Relocate regulator or protect with safety relief valve.
Possible Causes Remedies
A. Plugged spring chamber vent. A. Clean vent opening.
B. Fluid too viscous. B. Heat fl uid. Contact factory.