cashco 988 Руководство по установке, эксплуатации и техническому обслуживанию - Страница 10
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f.
Wrench-tighten the packing stud nuts (15)
evenly and in 1/2 rev o lu tion increments until
the "up per groove on the packing fol low er (5),
iden ti fied as "Line A" (Fig. 4), is flush with the
top edge of the bonnet's (2) stuffing box.
g.
Remove the packing nuts (15), lower retainers
(39) and pack ing follower (5).
h.
Carefully place the upper braided ring (6.4)
over the plug/stem's (3) end and push into the
stuff ing box similar to the lower braided ring
(6.4). Leave the packing follower in position,
prop er ly oriented.
i.
Place lower retainers (39) over each of the
pack ing studs (14). Install packing stud nuts
(15) and finger-tighten.
j.
Repeat Step f. with the exception that the
pack ing set (6) is to be compressed into the
stuff ing box until the "lower groove" identified
as "Line B" on the packing follower (5) is flush
with top edge of the bon net's (2) stuffing box.
k.
Remove the packing nuts (15). Leave the
fol low er (5) and lower retainers in place.
l.
Orient spring washer (41) stacks per Figure
5. Low er stacks over studs and onto ledge of
lower retainers (39).
m. Place spacer rings (40) over studs and onto
ledge of lower retainers (39).
n.
Place upper retainers (39) over pack ing studs
(14), and onto the ledge of the spac er rings
(40). Ensure the up per retainers (39) are
prop er ly po si tioned around its cir cum fer ence
and that the in ver sion is correct for HTE-Hi
versus HTE-Lo options.
o.
Install packing stud nuts (15), finger-tight, down
to the upper re tain ers (39).
p.
Manually stroke the plug/stem (3) a minimum
of fif ty full strokes.
q.
Ensure that packing stud nuts (15) are drawn
down such that the upper retainers (39) are
level with top of spac er rings (40). Wrench-
tighten pack ing stud nuts in 1/2 revolution
increments. Con tin ue to tighten nuts until
the spacer rings can no longer be man u al ly
rotated by use of fin gers; add 1/2 revolution of
ad di tion al draw-down to each nut to properly
load the pack ing (6).
33.
Reinstall the two stem jam nuts (52) onto the plug/
stem (3) and rotate as far down the as possible.
34.
Push valve stem (3) down into the seat ring
(11). Wig gle the loose assembly to ensure initial
align ment/stack ing.
35.
Tighten bonnet bolting (16, 17) in an alternating
cross-pat tern in 1/4 revolution increments to the
following torque lev els:
Size
3/4", 1", 1-1/2"
2
36.
Reinstall the actuator assembly (AA) as recorded
in Sub-Section V.C.
10
Torque
70-75 ft-lbs 95-102 N-M)
50-55 ft-lbs (68-75 N-M)
37.
Position suitable end closures – plugs, blind
flang es, etc., – and leak test with 100 psig air
pressure min i mum. No packing (6) adjustment
should be re quired to get a tight seal.
38.
Recalibrate per Section VI.
F.
Trim and Packing Removal and Replacement for
Units with Jammed Packing; Opt-38J, Opt-34A, Opt-
34B, Opt-34C:(See pg. 11 & 19 for Item # identification.)
1.
Remove (AA) as described in Sub-Sec tion V.B.
Leave (BA) in vise with plug/stem (3) upwards.
2.
Continue to loosen stem packing (6, 47) by
rotating pack ing stud nuts (15) CCW to just short
of disengagement from packing studs (14).
3.
Remove all bonnet stud nuts (17).
4.
Lift bonnet (2), plug/stem assembly (3), cage (10)
and all packing zone parts up and out of the body
- grasp stem (3) to prevent from falling. Lay these
parts horizontally on a workbench. NOTE: Seat ring
(11) (and seat retainer (23) and soft seat insert (24)
for com po si tion/soft seated de signs) may also pull
out with the above parts assembly.
5.
Remove both stem nuts (52).
6.
Withdraw plug/stem assembly (3) from within the
bon net (2) and packing (6, 47). Holding cage (10)
to pre vent from dropping. Set parts (3, 10) aside.
7.
Place bonnet (2) into a second vise with the pack ing
zone on top. Remove the two packing nuts (15).
8.
Remove packing flange (4), packing follower (5),
wiper ring (22) and TFE bias tape follower bush ing
(26).
Take extreme care to not mar internal wall surface of the
bonnet (2).
9.
Using a sharp, hooked-end, pick-type tool, hook
and pull the packing rings (47) up and out of the
bonnet's (2) stuffing box individually. Examine for
proper orientation (see Figures 7, 8, 9 and 10).
10.
Remove bonnet (2) from vise and invert to allow
lantern ring (27) or packing spacer (9) to slide out
of the bonnet's stuffing box.
For Opt-34 –
a.
Invert bonnet (2) again and place back in vise
with pack ing zone on top.
Take extreme care to not mar internal wall surface of the
bonnet (2).
CAUTION
CAUTION
IOM-988/989-BODY