cashco 8311HP Handbuch für Installation, Betrieb und Wartung - Seite 5
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VII. TROUBLE SHOOTING GUIDE
1. Erratic operation; chattering.
Possible Causes
A. Oversized regulator; inadequate rangeability.
B. Worn plug/stem assembly; inadequate guiding.
2. Leakage through the spring chamber vent hole.
Possible Causes
A. Normal-life diaphragm failure.
B. Abnormal short-life diaphragm failure.
3. Upstream pressure too high.
Possible Causes
A. Regulator undersized.
B. Incorrect range spring (screwing out CCW of
adjusting screw does not allow bringing pressure
to a stable and proper level).
C. Too much build.
D. Restricted diaphragm movement.
4. Sluggish operation.
Possible Causes
A. Plugged spring chamber vent.
B Fluid too viscous.
IOM-8311HP/LP
SECTION VII
A1. Check actual fl ow conditions, resize regulator for minimum and maximum
fl ow.
A2. Decrease regulator pressure drop; decrease inlet pressure by placing a
throttling orifi ce in inlet piping union.
A3. Install next step higher range spring. Contact factory.
A4. Before replacing regulator, contact factory.
B1. Contact factory.
A.
Replace diaphragm.
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-temperature
conditions.
B4. Upstream (inlet) pressure buildup occuring that overstresses dia-
phragms. Relocate regulator or protect with safety relief valve.
A1. Confi rm by opening bypass valve together with regulator.
A2. Check actual fl ow conditions, resize regulator; if regulator has inadequate
capacity, replace with larger unit.
B.
Replace range spring with proper lower range. Contact factory.
C1. Review build expected.
C2. Contact factory.
D.
Ensure no moisture in spring chamber at temperatures below freeze point.
Ensure no dust or debris entering vent opening. If rainwater or debris can
enter, re-orient spring chamber.
A.
Clean vent opening.
B.
Heat fl uid. Contact factory.
Remedies
Remedies
Remedies
Remedies
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