Cashco 123 - Manual (Page 5)

IOM-123-BASIC 5
SECTION VII
VII. TROUBLE SHOOTING GUIDE
6. Clean the body (1) cavity and all parts to be
reused according to owner's procedures.
NOTE: On reg u la tors originally supplied
as “spe cial cleaned”, Option-5, -36 or -55,
main te nance must in clude a level of clean li-
ness equal to Cash co’s cleaning standard
#S-1134. Con tact fac to ry for details.
7. Use special care when cleaning the fl at mat-
ing sur faces of the body (1) and cylinder (12)
shoulder. This pres sur ized joint is metal-to-
metal with no gas ket.
8. Lubricate the cylinder (12) threads lightly with
thread sealant. Install the cylinder (12) into
the body (1) and impact until tightly seat ed.
9. Reinstall the diaphragm sub-assembly in
ac cor dance with Sec tion VI.B., Diaphragm
Re place ment.
10. Bench test unit for suitable operation. NOTE:
Reg u la tors are not tight shutoff devices. Even
if pressure falls below set point, a regulator
may or may not develop bubble tight shutoff.
In general, tighter shutoff can be expected
with composition seat.
11. Spray liquid leak detector around body (1)
fl ange to test for leak age. Test pres sure
should be the max i mum al lowed.
3. Leakage through the spring chamber vent hole.
Possible Causes Remedies
A. Normal-life diaphragm failure. A. Replace diaphragm.
B. Abnormal short-life diaphragm failure. B1. Can be caused by excessive chattering. See No. 1 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. Upstream (inlet) pressure buildup occuring that overstresses
diaphragms.
2. Regulator inlet (upstream) pressure too high.
Possible Causes Remedies
A. Regulator undersized. A1. Confi rm by opening bypass valve together with regulator.
A2. Check actual fl ow conditions, resize regulator; if regulator has
inadequate capacity, replace with larger unit.
B. Plugged trim. B. Remove trim and check for plugged holes in cylinder.
C. Incorrect range spring (screwing out CCW of adjusting screw does
not allow bringing pressure level to a stable and proper level). C. Replace range spring with proper lower range. Contact factory.
D. Too much proportional band (rise). D. Review P.B. (rise) expected. Contact factory.
E. Restricted diaphragm movement. E Ensure no moisture in spring chamber at temperatures below
freezing. Ensure no dust or debris entering vent opening. If rainwater
or debris can enter, re-orient spring chamber.
1. Erratic Operation, chattering.
Possible Causes Remedies
A. Oversized regulator. A1. Check actual fl ow conditions, resize regulator for minimum and
maximum fl ow.
A2. Increase fl ow rate.
A3. Decrease regulator pressure drop; decrease inlet pressure by placing
throttling orifi ce in inlet piping union.
A4. Install next step higher range spring. Contact factory.
A5. Before replacing regulator, contact factory.
B. Inadequate rangeability.
B1. Increase fl ow rate.
B2. Decrease regulator pressure drop.
B3. Install next step higher range spring. Contact factory.
C. Worn piston/cylinder; inadequate guiding. C. Replace trim.