Cashco 345 - Manual (Page 5)

IOM-345 5
A. Regulator undersized. A1. Confi rm by opening bypass valve together with regulator.
A2. Check actual fl ow conditions, re-size 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 in CW of adjust- C. Replace range spring with proper higher range. Contact factory.
ing screw does not allow bringing pressure level
up to proper level).
D. Too much droop. D1. Review droop expected.
D2. Contact factory.
E. Restricted pressure piston movement. E. Assure no moisture in spring chamber at tem pera tures below freeze point.
Assure no dust or debris entering vent openings.
Remedies Possible Causes
3. Downstream Pressure will not reach desired setting.
A. Failure of body quad ring and body backup A. Inspect the pressure piston, body quad ring and body backup ring.
ring. If scratched, nicked, or deformed - replace.
Remedies Possible Causes
4. Leakage through the spring chamber vents.
A. Regulator not closing tightly. A.1. 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 trim.
A2. Inspect guides in body cap (Balanced trim). If damaged, replace body cap
and/or piston, quad ring and back up ring.
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 pressure piston movement. D. Assure no moisture in spring chamber at temperatures below freeze point.
Assure no dust or debris entering vent openings.
Possible Causes Remedies
5. Excessive pressure downstream.
A. Foreign matter on seating surface, erosion A. Inspect and replace damaged parts.
of seating surface, scratched body cap.
B. Balanced trim B. Inspect piston quad ring and back up ring. Replace if damaged.
Possible Causes Remedies
6. Excessive seat leakage.