6
IOM-8310HP-DIFF
SECTION VII
VII. TROUBLE SHOOTING GUIDE
A. Oversized regulator; inadequate rangeability.
A1. Check actual flow conditions, re-size regulator for minimum and maximum
flow.
A2. Decrease regulator pressure drop; decrease inlet pressure by placing a
throttling orifice in inlet piping union; 2-stage pressure drop by using with
another regulator in series.
A3. Install next step higher range spring. Contact factory.
A4. Before replacing regulator, contact factory.
B. Worn plug/stem assembly; inadequate guiding.
B1. Contact factory.
Remedies
Possible Causes
1. Erratic operation; chattering.
2. Leakage through the spring chamber vent hole.
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 diaphragm material.
B3. For composition diaphragms, assure not subjecting to over-temperature
conditions.
B4. Downstream (outlet) pressure buildup occuring that overstresses
diaphragms. Relocate regulator or protect with safety relief valve.
Remedies
Possible Causes
A. Plugged spring chamber vent.
A. Clean vent opening.
B Fluid too viscous.
B. Heat fluid. Contact factory.
Remedies
Possible Causes
5. Sluggish operation.
A. Regulator not closing tightly.
A. Inspect trim and plug alignment.
B. Downstream block.
B. Check system; isolate (block) flow at regulator inlet - not outlet. Relocate
regulator
if
necessary.
C. No pressure relief protection.
C. Install safety relief valve, or rupture disc.
D. Restricted diaphragm movement.
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.
4. Excessive pressure downstream.
Possible Causes
Remedies
A. Regulator undersized.
A1. Confirm by opening bypass valve together with regulator.
A2. Check actual flow conditions, re-size regulator; if regulator has inadequate
capacity, replace with larger unit.
B. Incorrect range spring (screwing in CW of adjust- B. Replace range spring with proper higher range. Contact factory.
ing screw does not allow bringing pressure level
up to proper level).
C. Too much droop.
C1. Review droop expected.
C2.
Contact
factory.
D. Restricted diaphragm movement.
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.
Remedies
Possible Causes
3. Downstream pressure will not reach desired setting.
