Cashco 1000 LP - Manual (Page 9)

IOM-1000LP-Basic 9
4. Excessive pressure downstream.
A. Regulator not closing tightly. A1. Overly compressed range spring; i.e. approaching solid height. Use next
higher range spring.
A2. Inspect the seating. Clean and lap metal seat surfaces; replace if lapping
does not remedy. If composition seats are depressed, nicked or
embedded with debris, replace seat disc.
A3. Diaphragm setting too high; check setting.
A4. Inlet pressure too high for orifi ce size; check permissible inlet (P
1
)
pressure level for a given outlet. Change to reduced port if required.
A5. Leakage past pressed in valve seat ring; consider integral seat.
A6. When diaphragm sub-assembly was put into place, the rocker arm got
between the stud collar and the stud nut rather than on top of the stud
collar.
B. Downstream block. B. Check system; isolate (block) fl ow at regulator inlet, not outlet. Relocate
regulator if necessary.
C. No pressure relief protection. C. Install safety relief valve, or rupture disc.
D. Restricted diaphragm movement. D1. Diaphragm setting too high; check and lower as required.
D2. 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.
5. Sluggish operation.
A. Plugged spring chamber vent. A. Clean vent opening.
B. Plugged piston or jet zone. B. Remove trim and clean.
C. Fluid too viscous. C. Heat fl uid.
D. Improper (undersized) jet. D. Replace existing piston with new piston for viscous service; i.e. Option-27.
6. Frequent resetting of setpoint.
A. Over-pressurization downstream resulting in: A1. Replace diaphragms. Correct potential source of downstream over-
1. Bent metal diaphragm(s). pressure.
2. Sprung rocker arm. A2. Check measurements of rocker arm. Replace if necessary.
3. Range spring overstressed/fatigued. A3. Replace range spring; consider next higher range spring.
Possible Causes Remedies
Possible Causes Remedies
Possible Causes Remedies