cashco DL Installation, Operation & Maintenance Manual - Page 5
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the inlet. Outlet should be tested to upper value
of range spring (14) with a 100 psig (6.9 Barg)
minimum.
NOTE:
When piston (15) assemblies are
used with comp seats, Cashco, Inc. does not
rec om mend attempting to remove the comp seat.
If composition seat is dam aged, re place entire
pis ton assembly.
VII. TROUBLE SHOOTING GUIDE
1. Erratic operation; chattering.
Possible Causes
A.
Oversized regulator.
B.
Inadequate rangeability (regulator full capacity
approximately 50% utilized).
C.
Worn piston/cylinder; inadequate guiding.
D.
Weakened/broken piston spring.
E.
Flow induced instability.
2. Downstream pressure will not reach desired setting.
Possible Causes
A.
Regulator undersized.
B.
Plugged trim.
C.
Incorrect range spring (screwing in CW of ad-
justing screw does not allow bringing pressure
level up to proper level).
D.
Too much proportional band (droop).
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.
IOM-D/DL
SECTION VII
A1.
Check actual flow conditions, resize regulator for minimum and maximum flow.
A2.
Decrease regulator pressure drop; decrease inlet pressure by placing a throttling orifice
in inlet piping union; 2-stage pressure drop by using with another regulator in series.
A3.
Install next step higher range spring. Contact factory.
A4.
Before replacing regulator, contact factory.
B1.
Decrease regulator pressure drop; decrease inlet pressure by placing a throttling orifice
in inlet piping union; 2-stage pressure drop by using with another regulator in series.
B2.
Install next step higher range spring. Contact factory.
C.
Replace trim.
D.
Replace piston spring. Determine if corrosion is causing the failure; if so, then consider
alternate trims.
E.
Replace piston with piston that includes Opt-4 Stabilizer seal.
A1.
Confirm by opening bypass valve together with regulator.
A2.
Check actual flow conditions, resize regulator; if regulator has inadequate capacity,
replace with larger unit.
B.
Remove trim and check for plugged holes in cylinder.
C.
Replace range spring with proper higher range. Contact factory.
D1.
Review P.B. (droop) expected.
D2.
Contact factory.
E.
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.
Replace diaphragm.
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-temperature conditions.
B4.
Downstream (outlet) pressure buildup occurring that overstresses diaphragms. Relocate
regulator or protect with safety relief valve.
Remedies
Remedies
Remedies
5