Owner manual

IOM-P5

SECTION VII

VII. TROUBLE SHOOTING GUIDE

2. Regulator can not pass sufﬁ cient ﬂ ow.

1. Erratic operation; chattering.

4. Excessive pressure downstream.

3. Sluggish operation.

Possible Causes Remedies

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.

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. Determine if corrosion is causing the failure.

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. Too much droop. B1. Review droop expected.

B2. Contact factory.

Possible Causes Remedies

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

Possible Causes Remedies

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 piston movement. D. Ensure no moisture in spring chamber at temperatures below freeze point.