cashco 4381 Посібник з монтажу, експлуатації та технічного обслуговування - Сторінка 3
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V. SHUTDOWN
1. On systems with a bypass valve, and where
sys tem pressure is to be main tained as the
reg u la tor is shut down, slowly open the bypass
valve while closing the inlet (up stream) block
valve. Fully close the inlet (up stream) block valve.
(When on bypass, the sys tem pres sure must be
con stant ly observed and man u al ly reg u lat ed.
Close the outlet (down stream) block valve.
VI. MAINTENANCE
SYSTEM UN DER PRES SURE. Prior to performing any
maintenance, isolate the reg u la tor from the system and
relieve all pres sure. Failure to do so could result in
personal injury.
A. General:
1. Maintenance procedures hereinafter are
based upon re mov al of the regulator unit from
the pipeline where in stalled.
2. Owner should refer to owner's procedures for
removal, handling, cleaning and disposal of
nonreusable parts, i.e. gaskets, etc.
3. Refer to Figure 1, Model 3381 or 4381 for the
basic regulator and Figure 2, Model 3381 or
4381 for the cryo gen ic regulator. Blow-ups of
op tions and the com po si tion seat trim are on
either draw ing.
B. Diaphragm Replacement - Model 3381:
To prevent damage to body, use soft jaws when securing
the body in a vise. Position so that vise closes over the
inlet and the outlet connections.
SPRING UNDER COMPRESSION. Prior to re mov ing the
spring chamber, relieve spring com pres sion by back ing
out the adjusting screw. Fail ure to do so may result in
flying parts that could cause personal injury.
1. Securely body (1) in a vise with the spring
chamber (2) oriented upwards.
2. Relax range spring (17) by turning adjusting
screw (8) CCW until removed from spring
cham ber (2).
IOM-3381/4381
WARNING
CAUTION
WARNING
SECTION V
Do not walk away and leave a bypassed reg u la tor
unattended.
2. If the regulator and system are to both be shut
down, slowly close the inlet (upstream) block
valve. Close the outlet (downstream) valve only
if reg u la tor re mov al is required.
SECTION VI
3. Loosen spring chamber (2) by placing wrench
on "flats" and rotating CCW making sure not
to use the flat where the vent hole is located.
4. Remove spring chamber (2), range spring
(17) and spring button (5).
5. Remove the diaphragm subassembly
con sist ing of the pressure plate nut (10), lock
wash er (9), pres sure plate (3), diaphragm
(13), push er plate seal (15) and pusher
plate (4). NOTE: Refer to the quan tity of
dia phragms (13) in cor po rated per the bill
of ma te ri als listing.
pres sure level, multiple metal diaph ragms
may be "stacked".
6. Loosen pusher plate nut (10) and separate
all parts (3, 4, 9, 13 & 15) of the diaphragm
subassembly.
7. Inspect pressure plate (3) to ensure no
de for ma tion due to over-pressurization. If
de formed, replace.
8. Remove diaphragm gasket (14). (If a
composition di a phragm is used there is no
di a phragm gasket (14).
9. Clean body (1) and diaphragm flange. Do not
scratch diaphragm gasket seating sur face.
NOTE: On regulators origi nally sup plied as
"oxygen clean", Option s 3381-5 & -55, 4381-
36 & -55, main tenance must in clude a level
of clean li ness equal to Cash co's clean ing
CAUTION
De pend ing on outlet
Diaphragm Sub as sem bly
3