cashco 6987 Установка, эксплуатация и обслуживание - Страница 5
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VII. TROUBLE SHOOTING GUIDE
1. Erratic Operation; chattering.
Possible Causes
A.
Oversized regulator.
B.
Inadequate rangeability.
C.
Worn piston/cylinder; inadequate guiding.
2.
Regulator inlet (upstream) pressure too high.
Possible Causes
A.
Regulator undersized.
B.
Plugged renewal unit.
C.
Incorrect range spring (screwing out CCW of
adjusting screw does not allow bringing pressure level
to a stable and proper level).
D.
Too much proportional band (rise).
E.
Restricted diaphragm movement.
3.
Leakage through the spring chamber vent hole.
Possible Causes
A.
Normal-life diaphragm failure.
B.
Abnormal short-life diaphragm failure.
4.
Sluggish Operation.
Possible Causes
A.
Plugged spring chamber vent.
B.
Plugged piston guides.
C.
Fluid too viscous
IOM-6987
SECTION VII
A1.
Check actual flow conditions, resize regulator for minimum and
maximum flow.
A2.
Increase flow rate.
A3.
Decrease regulator pressure drop; decrease inlet pressure by placing
throttling orifice in inlet piping union.
A4.
Install next step higher range spring. Contact factory
A5.
Before replacing regulator, contact factory.
B1.
Increase flow rate.
B2.
Decrease regulator pressure drop.
B3.
Install next step higher range spring. Contact factory
C.
Replace renewal unit.
A1.
Confirm by opening bypass valve together with regulator.
A2.
Check actual flow conditions, resize regulator; if regulator has
in ad e quate capacity, replace with larger unit.
B.
Remove renewal unit and check for plugged holes in cylinder.
C.
Replace range spring with proper lower range. Contact factory.
D1.
Review P.B. (rise) expected.
D2.
Contact factory.
E.
Ensure no moisture in spring chamber at temperatures below freezing.
Ensure no dust or debris entering vent opening. If rainwater or debris
can enter, re-orient spring chamber.
A.
Replace diaphragms.
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-tem pera ture
conditions.
B4.
Upstream (inlet) pressure buildup occurring that overstresses
di a phragms.
A.
Clean vent opening.
B.
Re move renewal unit and clean.
C.
Heat fluid. Contact factory.
Remedies
Remedies
Remedies
Remedies
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