Cashco SA4 User Manual
Page 8
IOM-CA4/SA4
8
Possible Causes
Remedies
A. Body bolts not torqued properly.
A1. Torque to proper value (see Section VII, F.13).
A2. Failed C-ring seal. Replace seal.
B. Pressures at diaphragm may be too
high for regulator design.
B. Consult factory.
Possible Causes
Remedies
A. Contamination (debris) in regulator.
A1. Remove internals, clean and if necessary, replace sealing
seating elements. *
A2. Install UHP fi lter at inlet.
B. Oversized regulator; plug operates
directly next to seat.
B. Check actual fl ow conditions; resize regulator for minimum and
maximum fl ow; if necessary, replace with smaller regulator.
* Excess seat leakage may be diagnosed when a failure of the dynamic side seal has occurred. Inspect both
potential internal leak paths.
C. Failure due to wear.
C1. Replace seat.
C2. Replace all internal trim due wear.
D. Improper installation.
D1. Failure to "coin" CTFE or VTFE seat; disassemble and "coin".
D2. Improper re-assembly. Disassemble and re-assemble per
instructions within IOM.
4.
Leakage at diaphragm fl ange.
5.
Leakage across seat.