cashco 1164 Handbuch für Installation, Betrieb und Wartung - Seite 5

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cashco 1164 Handbuch für Installation, Betrieb und Wartung
VII. TROUBLE SHOOTING GUIDE
1.
Erratic Operation; chattering.
Possible Causes
A.
Oversized regulator.
B.
Inadequate Rangeability.
Regulator inlet (upstream) pressure too high.
2.
Possible Causes
A.
Regulator undersized.
B.
Incorrect range spring (screwing out CCW of adjusting
screw does not allow bringing pressure level to a stable
and proper level).
C.
Too much build.
D.
Restricted diaphragm movement.
Excessive seat leakage.
3.
Possible Causes
A.
Foreign matter on the seating surface, erosion of the seat-
ing surface or foreign matter on plug balancing O-ring.
Leakage through the spring chamber vent hole.
4.
Possible Causes
A.
Normal-life diaphragm failure.
B.
Abnormal short-life diaphragm failure.
Sluggish operation.
5.
Possible Causes
A.
Plugged spring chamber vent.
B.
Fluid too viscous.
C.
Broken spring.
IOM-1164
SECTION VII
A1.
Check actual flow conditions, resize regulator for mini-
mum and maximum flow.
Tighten flange bolting.
A2.
Increase flow rate.
A3.
Decrease regulator pressure drop; decrease inlet pres-
sure by placing a throttling orifice in inlet piping union.
A4.
Install next step higher range spring.
A5.
Before replacing regulator, contact factory.
B1.
Increase flow rate.
B2.
Decrease regulator pressure drop.
B3.
Install next step higher range spring. Contact factory.
A1.
Confirm by opening bypass valve together with regulator.
A2.
Check actual flow conditions, resize regulator; if regulator
has inadequate capacity, replace with larger unit.
B.1
Replace range spring with proper lower range.
B.2
Contact factory.
C1.
Review build expected.
C2.
Contact factory.
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.
A.
Clean or replace plug assembly (TFE seat). For metal
replace regulator if integral seat is damaged. Replace
plug and O-ring.
A.
Replace diaphragm.
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.
Upstream (inlet) pressure build-up occurring that over-
stresses diaphragms. Relocate regulator or protect with
safety relief valve.
A.
Clean vent opening.
B.
Heat fluid. Contact factory.
C.
Replace spring.
Remedies
Remedies
Remedies
Remedies
Remedies
5