cashco 1000HP-5 Руководство по установке, эксплуатации и техническому обслуживанию - Страница 10
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4.
Excessive pressure downstream.
Possible Causes
Regulator not closing tightly.
A.
Downstream block.
B.
No pressure relief protection.
C.
Restricted diaphragm movement.
D.
5.
Sluggish operation.
Possible Causes
A.
Plugged spring chamber vent.
B.
Plugged piston or jet zone.
C.
Plugged drain and vent opening.
6.
Frequent resetting of setpoint.
Possible Causes
Over-pressurization downstream resulting in:
A.
1.
Bent metal diaphragm(s).
2.
Sprung rocker arm.
3.
Range spring overstressed/fatigued.
10
A1.
Overly compressed range spring; i.e. approaching solid height. Use
next higher range spring. Contact factory.
A2.
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 seat disc.
A3.
Diaphragm setting too high; check setting.
A4.
Inlet pressure too high for orifice size; check permissible inlet (P
pressure level for a given outlet. Change to reduced port if required.
Leakage past pressed in valve seat ring; consider integral seat.
A5.
When diaphragm sub-assembly was put into place, the rocker arm
A6.
got between the stud collar and the stud nut rather than on top of
the stud collar.
B.
Check system; isolate (block) flow at regulator inlet, not outlet. Re-
locate regulator if necessary.
C.
Install safety relief valve, or rupture disc.
D1.
Diaphragm setting too high; check and lower as required.
D2.
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, re-orient spring chamber.
A.
Clean vent opening.
B.
Remove trim and clean.
C.
Clear opening & purge.
A1.
Replace diaphragms. Correct potential source of downstream over-
pressure.
A2.
Check measurements of rocker arm. Replace if necessary.
A3.
Replace range spring; consider next higher range spring.
Remedies
Remedies
Remedies
IOM-1000HP-Cryogenic
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