cashco 3381 Руководство по установке, эксплуатации и техническому обслуживанию - Страница 5
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4.
Clean flat mating surfaces of body (1) to body
cap (6) shoulder. Be careful not to scratch
either surface.
5.
Clean debris from within the body (1) cavity.
Parts to be reused should be cleaned
ac cord ing to own er's pro ce dures. NOTE:
On regulators orig i nal ly sup plied as "ox y gen
clean", Options
& 55 main te nance must in clude a level of
clean li ness equal to Cashco's clean ing stan-
dard #S-1134.
sup plied as "cleaned for Phar ma ceu ti cal
and Food ap pli ca tions" Op tions 4381-37
and 4381-37S, main te nance must include a
level of clean li ness equal to Cashco cleaning
stan dard #S-1576.
details.
6.
If supplied with Opt-4 Stabilizer, install new
stabilizer seal (30) properly oriented onto
piston (16).
7.
Slide the piston (16), including stabilizer seal
(30) if supplied, slowly into the body cavity.
Use thumbs to ease stabilizer seal(30) into
the body cavity.
VII. TROUBLE SHOOTING GUIDE
1. Erratic operation; chattering.
Possible Causes
A.
Oversized regulator; inadequate rangeability.
B.
Worn piston; inadequate guiding.
C.
Weakened/broken piston spring.
2. Regulator can't pass sufficient flow.
Possible Causes
A.
Regulator undersized.
B.
Incorrect range spring (screwing in CW of ad-
justing screw does not allow bringing pressure
level up to proper level).
C.
Too much droop.
3. Leakage through the spring chamber vent hole.
Possible Causes
A.
Normal-life diaphragm failure.
B.
Abnormal short-life diaphragm failure.
IOM-3381/4381
3381-5 & -55, 4381-36
For regulators orig i nal ly
Con tact factory for
SECTION VII
A1.
Check actual flow conditions, re-size regulator for minimum and maximum flow.
A2.
Increase flow rate.
A3.
Decrease regulator pressure drop; decrease inlet pressure by placing a throttling orifice
in inlet piping union.
A4.
Install next step higher range spring. Contact factory.
A5.
Before replacing regulator, contact factory.
B.
Replace trim ( possible body replacement).
C.
Replace piston spring. De ter mine if corrosion is causing the failure.
A1.
Confirm 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.
Replace range spring with proper higher range. Contact factory.
C1.
Review droop expected.
C2.
Contact factory.
A.
Replace diaphragm.
B1.
Can be caused by excessive chattering. See No. 1. to remedy chatter.
B2.
Can be caused by corrosive action. Consider alternate diaphragm material.
B3.
For composition diaphragms, ensure not subjecting to over-temperature conditions.
B4.
Downstream (outlet) pressure buildup occurring that overstresses diaphragms. Relo-
cate regulator or protect with safety relief valve.
8.
Place piston spring (7) over spring hub of the
piston (16).
9.
Apply pipe thread sealant to the body cap (6)
threads. Screw body cap (6) into body (1).
When body cap is fully down against body
(1) at the body cap (6) shoulder, impact the
body cap (6) into the body (1). NOTE: When
unit is put into service and pressurized, these
two parts seal metal-to-metal with no gasket.
10. Bench test unit for suitable operation. NOTE:
Regulators are not tight shutoff devices.
Even if pressure builds up beyond set point,
a reg u la tor may or may not develop bubble
tight shutoff. In general, tighter shutoff can
be expected with composition seat.
11. Pressurize with air and spray liquid leak
de tec tor to test around body cap (6) and body
(1) for leak age. Test pres sure should be a
mini mum of 100 psig (6.9 Barg) at the inlet.
Remedies
Remedies
Remedies
5