cashco 1000HP Panduan Pemasangan, Pengoperasian & Pemeliharaan - Halaman 11
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4. Excessive pressure downstream.
Possible Causes
A. Regulator not closing tightly.
B. Downstream block.
C. No pressure relief protection.
D. Restricted diaphragm movement.
5. Sluggish operation.
Possible Causes
A. Plugged piston or jet zone.
B. Fluid too viscous.
C. Improper (undersized) jet.
6. Frequent resetting of setpoint.
Possible Causes
A. Overpressurization downstream resulting in:
1. Bent metal diaphragm(s)
2. Sprung rocker arm
3. Range spring overstressed/fatigued.
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Remedies
A1. Overly compressed range spring; i.e. approaching
solid height. Use next higher range spring.
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 disk.
A3. Diaphragm setting too high; check setting.
A4. Inlet pressure too high for orifice size; check
permissible inlet (P
outlet. Change to reduced port if required.
A5. Leakage past pressed in seat ring; consider
integral seat.
A6. When diaphragm subassembly was put into place,
the rocker arm 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. Relocate 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 spacer ring at temperatures
below freeze point. Ensure no dust or debris
entering vent opening. If rainwater or debris can
enter, reorient spring chamber. (Not possible on
-1+6.)
Remedies
A.
Remove trim and clean.
B.
Heat fluid.
C.
Replace existing piston with new piston for
viscous service; i.e. Opt-27.
Remedies
A1. Replace diaphragms. Correct potential source of
downstream overpressure.
A2. Check measurements of rocker arm. Replace if
necessary.
A3. Replace range spring; consider next higher range
spring.
) pressure level for a given
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