Cashco SA4 User Manual
Page 7
IOM-CA4/SA4
7
SECTION VIII
VIII. TROUBLE SHOOTING GUIDE
When trouble shooting this regulator there are many possibilities as to what may be causing problems. Many
times, the regulator itself is not defective, but one or more of the accessories may be. Sometimes the pro cess
may be causing diffi culties.
The key to effi cient trouble shooting is information and communication. The customer should try to be as precise
as possible in their explanation of the problem, as well as their understanding of the application and operating
con di tions.
It is imperative the following information be provided by the customer:
Fluid
(with
fl uid properties)
Range
of
fl ow rate
Range of inlet pressure
Range of outlet pressure
Range
of
fl uid temperature
Range of ambient temperature
Pressure readings should be taken at every location that pressure plays a role - i.e., regulator inlet (as close as
possible to inlet port), regulator outlet (as close as possible to outlet port), etc.
Below are some of the more common complaints along with possible causes and remedies.
Possible Causes
Remedies
A. Sticking of internal parts
A. Remove internals, clean, and if necessary, replace.
B. Oversized regulator
B. Check actual fl ow conditions; resize regulator for min i mum
and maximum fl ow; if necessary, replace with smaller
regulator.
1.
Erratic regulation, instability or hunting.
Possible Causes
Remedies
A. Supply pressure is down (confi irm
on pressure gauge).
A. Increase supply pressure
B. Undersized regulator.
B. Check actual fl ow conditions; resize regulator for minimum
and maximum fl ow; if necessary, replace with larger regulator.
Possible Causes
Remedies
A. Differential pressure across dia-
phragm may have exceeded limits.
(See Table 1 in Tech Bulletin).
A. Be aware of limits as well as where the various pressures are
acting. Install pressure safety equipment as necessary.
Pressure limit for outlet is lower than the limit of the inlet.
3.
Diaphragm continually breaks.
2.
Downstream pressure will not reach desired setting.