cashco DL Manuale di installazione, funzionamento e manutenzione - Pagina 3
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V. SHUTDOWN
1.
On systems with a bypass valve, and where sys tem
pressure is to be maintained as the reg u la tor is shut
down, slowly open the bypass valve while reducing
spring tension or loading pressure (Opt.-20) and
slowly closing the inlet (up stream) block valve.
When all loading pressure is relieved, fully close the
inlet (upstream) block valve. (When on bypass, the
system pressure must be constantly observed and
manually reg u lat ed.) Close the outlet (down stream)
block valve.
VI. MAINTENANCE
A. General:
SYSTEM UNDER PRESSURE. Prior to per form ing
any maintenance, isolate the regulator from the
system and relieve all pres sure. Failure to do so
could result in personal injury.
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
re mov al, handling, cleaning and disposal of
nonreusable parts, i.e. gaskets, etc.
3.
Refer to Figure 2 for basic regulator. For blow-
ups of Option-4 Stabilizer, refer to Figure 1.
B. Diaphragm Replacement:
1.
Securely install the body (1) in a vise with
the spring chamber (2) loading chamber (33)
directed upwards.
SPRING UNDER COMPRESSION. Prior to removing
flange bolts, relieve spring com pres sion by backing
out the ad just ing screw. Failure to do so may result
in flying parts that could cause personal injury.
2.
Relax range spring (14) by turning adjusting
screw (6) CCW until removed from spring
cham ber (2).
hand wheel is utilized, the adjusting screw
and locknut (7) are re placed respectively by
hand wheel adjusting screw (20) and locking
lever (21). Refer to Figure 6.
3.
Draw or embed a match mark between body (1)
and spring chamber (2) or loading chamber (33)
along flanged area.
IOM-D/DL
WARNING
WARNING
NOTE:
If the D-3 Option
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,
remove all spring tension or loading pressure while
slowly closing the inlet (upstream) block valve.
Close the outlet (downstream) valve only if reg u la tor
removal is required.
SECTION VI
4.
Remove all diaphragm bolts (8), washers (26),
and lock washers (25).
5.
Remove spring chamber (2), (loading chamber
33),range spring (14), spring button (4),
pressure plate (3), diaphragm(s) (12), and
diaphragm gasket (13) for metal diaphragm.
NOTE: Refer to the quan tity of diaphragms
(12) in cor po rat ed per the bill of materials listing.
Depending on outlet pres sure level, multiple
metal diaph ragms may be "stacked".
6.
Remove pusher plate (11) and inspect for a
fit which limits its travel to a vertical direction.
Wear will show as ex ces sive wobble in push er
plate. If apparent, recommend trim removal
and inspection; go to Sub-Sec tion C fol low ing.
Re in stall pusher plate.
7.
Inspect pressure plate (3) to ensure no
de for ma tion due to over-pressurization.
de formed, replace.
8.
Clean body (1) and spring chamber (2)
flanges.
supplied as "ox y gen clean", Option D-5, D-36,
D-55, or DL-55, main tenance must include a
level of clean li ness equal to Cashco cleaning
standard #S-1134.
supplied as "cleaned for Phar ma ceu ti cal and
Food ap pli ca tions" Op tion D-37 or D-37S,
main te nance must in clude a level of cleanliness
equal to Cashco cleaning stan dard #S-1576.
9.
Place diaphragm gasket (13) on body (1) flange,
if included.
place. Vi su al ly center pres sure plate (3) onto
diaphragm(s), NOTE: No dia phragm gasket
(13) for com po si tion dia phragm.
10. Set range spring (14) onto retainer hub of
pressure plate (3). Place multi-purpose, high
temperature grease into depression of spring
CAUTION
NOTE:
On regulators originally
On reg u la tors originally
Position diaphragm(s) (12) into
If
3