cashco 345 설치, 운영 및 유지보수 매뉴얼 - 페이지 5

{카테고리_이름} cashco 345에 대한 설치, 운영 및 유지보수 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. cashco 345 8 페이지. Pressure reducing regulator

페이지 인쇄
cashco 345 설치, 운영 및 유지보수 매뉴얼
3. Downstream Pressure will not reach desired setting
Possible Causes
A.
Regulator undersized.
B.
Plugged trim.
C.
Incorrect range spring (screwing in CW of adjusting screw does
not allow bringing pressure level up to proper level).
D.
Too much droop.
E.
Restricted pressure piston movement.
4. Leakage through the spring chamber vents.
Possible Causes
A.
Failure of body quad ring and body backup ring.
5. Excessive pressure downstream.
Possible Causes
A.
Regulator not closing tightly.
B.
Downstream block.
C.
No pressure relief protection.
D.
Restricted pressure piston movement.
6. Excessive seat leakage.
Possible Causes
A.
Foreign matter on seating surface, erosion of seating surface,
scratched body cap.
B.
Balanced trim
IOM-345
Remedies
A1. Confi rm by opening bypass valve together with regulator.
A2. Check actual flow conditions, re-size regulator; if regulator has
inadequate capacity, replace with larger unit.
B.
Remove trim and check for plugged holes in cylinder.
C.
Replace range spring with proper higher range. Contact factory.
D1. Review droop expected.
D2. Contact factory.
E.
Assure no moisture in spring chamber at tem pera tures below
freeze point. Assure no dust or debris entering vent openings.
Remedies
A.
Inspect the pressure piston, body quad ring and body backup
ring. If scratched, nicked, or deformed - replace.
Remedies
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.
Check system; isolate (block) flow at regulator inlet - not outlet.
Relocate regulator if necessary.
C.
Install safety relief valve, or rupture disc.
D.
Assure no moisture in spring chamber at temperatures below
freeze point Assure no dust or debris entering vent openings.
Remedies
A. Inspect and replace damaged parts.
B. Inspect piston quad ring and back up ring. Replace if damaged.
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