cashco 1000HP Panduan Pemasangan, Pengoperasian & Pemeliharaan - Halaman 9
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of the piston (24) to ensure free movement.
(Total move ment is ap prox i mate ly 1/8"
(3mm).
13. Bench test unit for suitable operation and
seat leak age. NOTE: Regulators are not
VII. TROUBLE SHOOTING GUIDE
1. Erratic operation; chattering.
Possible Causes
A. Oversized regulator; inadequate rangeability.
B. Worn piston/cylinder; inadequate guiding.
C. Flow induced instability.
D. Improper (oversized) jet.
E. Plugged trim.
F. Unstable loading pressure.
9
normally tight shutoff devices. Pressure must
build above setpoint for best shutoff.
14. Soap solution test around cylinder (21)-to-
body (1) connection for leakage. Test
pres sure should be a min i mum of 100 psig at
the inlet or actual service con di tions if higher.
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 a throttling orifice in inlet
piping union.
A4. Replace full orifice with reduced orifice; i.e. new
cylinder required.
B.
Replace trim.
C1. Get straight runs of piping (5 diameters upstream,
10 downstream) to and from regulator.
C2. Ensure outlet velocity is not excessive; use pipe
reducer close to regulator outlet.
C3. Add next higher range spring. Contact factory.
C4. If composition diaphragm, switch to metal
diaphragm.
D.
Replace existing piston with new piston with
proper jet.
E.
Remove trim and check for plugged holes in
piston, or debris in guide zone or jet zone.
F1. Stabilize loading pressure; i.e. pump, control
valve, etc.
F2. Air in loading piping. Vent spring chamber.
Remedies
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