Owner's manual

IOM-P3

SECTION VII

VII. TROUBLE SHOOTING GUIDE

A. Oversized regulator; inadequate rangeability. 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.

A5. Before replacing regulator, contact factory.

B. Worn poppet; inadequate guiding. B. Replace trim ( possible body replacement).

C. Weakened/broken poppet spring. C. Replace poppet spring. De ter mine if corrosion is causing the failure.

Remedies

2. Regulator can't pass sufﬁ cient ﬂ ow.

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 (adjusting aluminum knob B. Replace range spring with proper higher range.

CW does not raise pressure to proper level).

C. Too much droop. C1. Review droop expected.

C2. Contact factory.

RemediesPossible Causes

1. Erratic operation; chattering.

Possible Causes

A. Regulator not closing tightly. A. Inspect the seating. Clean and lap metal seat surfaces; replace if lapping

does not remedy. If composition seats are depressed, nicked or embedded

with debris, replace trim.

B. Downstream block. B. Check system; isolate (block) ﬂ ow 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.

Possible Causes Remedies

4. Excessive pressure downstream.

3. Sluggish operation.

RemediesPossible Causes

A. Fluid too viscous. A. Heat ﬂ uid. Contact factory.