Owner's manual

IOM-1465
5
5. Sluggish operation.
2. Leakage through the spring chamber vent hole.
3. Regulator can't pass suffi cient fl ow.
4. Excessive pressure downstream.
6. Excessive seat leakage.
7. Leakage out of threaded connection between body and spring chamber.
Possible Causes Remedies
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, ensure not subjecting to over-
temperature conditions.
B4. Downstream (outlet) pressure buildup occurring that overstresses
diaphragms. Relocate regulator or protect with safety relief valve.
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. Plugged trim.
B. Remove regulator from line and check for debris in inlet
connection.
C. Incorrect range spring(screwing in
CW of adjsting screw
does not allow bringing pressure
level up to proper level).
C. Replace range spring with proper higher range. Contact factory.
D. Too much droop
D1. Review droop expected.
D2. Contact factory.
E. Cavitation
E. Use multiple 1465's in series to stage the pressure drops. Refer
to 1465 Technical Bulletin for water cavitation chart.
Possible Causes Remedies
A. Regulator not closing tightly.
A. Inspect the seating. Check tht plug (3), plug spring (4), and spring
seat (5) are centered in body (1) cavity. Replace regulator should
these steps not remedy.
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. Ensure no dust or debris entering vent opening. If
rainwater or debris enter, re-orient regulator.
Possible Causes Remedies
A. Fluid too viscous. A. Heat fl uid. Contact factory
Possible Causes Remedies
A. Foreign matter on seating surface,
erosion of seating surface.
A. Inspect and clean seat. If seat eroded, replace regulator.
B. Cavitation
B. Use multiple 1465's in series to stage pressure drops. Refer to
1465 Technical Bulletin for water cavitation chart.
Possible Causes Remedies
A. Insuffi cient spring chamber torque. A. Tighten spring chamber on body using suffi cient torque.
B. Damaged o-ring B. Replace o-ring.