cashco 1000HP Panduan Pemasangan, Pengoperasian & Pemeliharaan - Halaman 10
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Halaman Cetak
2. Regulator differential pressure too low.
Possible Causes
A. Setpoint too low.
B. Regulator undersized; outlet pressure
(P
) droops below loading pressure
2
(P
).
Load
C. Plugged inlet strainer.
D. Plugged trim.
E. Incorrect range spring (turning adjusting
screw CW does not allow bringing pressure
level up to proper level).
F. Too much proportional band (droop);
outlet pressure (P
pressure (P
Load
G. Restricted diaphragm movement. (Pressure
plate hitting downstops.)
3. Leakage through the body spacer vent hole, or mixing of fluids.
Possible Causes
A. Normal-life diaphragm failure.
B. Abnormal short-life diaphragm failure.
C. Pusher plate gasket or O-Ring leaking.
10
) droops below loading
2
).
Remedies
A.
Turn adjusting screw down (CW) to increase
setpoint.
B1. Confirm by opening bypass valve together with
regulator.
B2. Check actual flow conditions, resize reg u la tor;
if regulator has inadequate capacity, replace with
larger unit.
C.
Remove strainer screen and clean; consider
leaving screen out.
D.
Remove trim and check for plugged holes in
piston, or debris in guide zone or jet zone.
E.
Replace range spring with proper higher range.
Contact factory.
F1. Re view P.B. (droop) expected. (See 2.B1 above.)
F2. Diaphragm setting too low; check setting and
raise as required.
F3. Consider composition diaphragm over metal.
F4. Improper jet; make sure jet matches actual fluid.
G.
Diaphragm setting too low; check and raise
as required.
Remedies
A.
Replace diaphragm.
B1. Can be caused by excessive chattering. See No.
1. to remedy valve chatter.
B2. Can be caused by corrosive action. Consider
alternate diaphragm material.
B3. For composition diaphragms, ensure not subject-
ing to over-temperature conditions.
B4. Downstream (outlet) pressure buildup occurring
that overstresses diaphragms.
B5. Shutoff of valve inlet pressure while loading
pressure is still on.
C.
Replace gasket and O-ring.
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