Cashco 1164 - Manual (Page 5)

IOM-1164 5
SECTION VII
VII. TROUBLE SHOOTING GUIDE
Possible Causes Remedies
A. Oversized regulator. A1.
A2.
A3.
A4.
A5.
Check actual fl ow conditions, resize regulator for mini-
mum and maximum fl ow.
Tighten fl ange bolting.
Increase fl ow rate.
Decrease regulator pressure drop; decrease inlet pres-
sure by placing a throttling orifi ce in inlet piping union.
Install next step higher range spring.
Before replacing regulator, contact factory.
B. Inadequate Rangeability. B1.
B2.
B3. Increase fl ow rate.
Decrease regulator pressure drop.
Install next step higher range spring. Contact factory.
1. Erratic Operation; chattering.
Possible Causes Remedies
A. Regulator undersized. A1.
A2. Confi rm by opening bypass valve together with regulator.
Check actual fl ow conditions, resize regulator; if regulator
has inadequate capacity, replace with larger unit.
B. Incorrect range spring (screwing out CCW of adjusting
screw does not allow bringing pressure level to a stable
and proper level). B.1
B.2 Replace range spring with proper lower range.
Contact factory.
C. Too much build. C1.
C2. Review build expected.
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, reorient
spring chamber.
2. Regulator inlet (upstream) pressure too high.
Possible Causes Remedies
A. Foreign matter on the seating surface, erosion of the seat-
ing surface or foreign matter on plug balancing O-ring. A. Clean or replace plug assembly (TFE seat). For metal
replace regulator if integral seat is damaged. Replace
plug and O-ring.
3. Excessive seat leakage.
Possible Causes Remedies
A. Normal-life diaphragm failure. A. Replace diaphragm.
B. Abnormal short-life diaphragm failure. B1.
B2.
B3.
Can be caused by excessive chattering. See No. 1. to
remedy chatter.
Can be caused by corrosive action. Consider alternate
diaphragm material.
Upstream (inlet) pressure build-up occuring that over-
stresses diaphragms. Relocate regulator or protect with
safety relief valve.
4. Leakage through the spring chamber vent hole.
Possible Causes Remedies
A. Plugged spring chamber vent. A. Clean vent opening.
B. Fluid too viscous. B. Heat fl uid. Contact factory.
C. Broken spring. C. Replace spring.
5. Sluggish operation.