10 | Baker Hughes
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8.2 Quick-Change Trim
(Figure 13 or 15)
A.
CIean all gasket mating surfaces.
B.
Install seat ring gasket (15) and seat ring (14).
Note:
Spiral wound gaskets (11 & 15) are standard in the
21000 Series design. It is imperative that a new gasket
be installed each time the valve is disassembled.
C.
Install cage (13).
D.
Carefully install plug and stem assembly.
Note:
Valve should be lapped before final assembly.
See Section 7.3.
Note:
For 2" valves with C
v
30 Lo-dB / Anti-Cavitation
trim only, steps C and D must be reversed such that the
plug and stem assembly is installed prior to the cage.
E.
Install body gasket (11).
F.
Assemble bonnet (8) and body stud nuts (10) and tighten.
Bonnet must be positioned so the packing flange studs are
at 90° to the flow center line.
CAUTION
CAUTION
WARNING
DANGER
Care must be taken to ensure that the cage, seat,
and bonnet are properly aligned in the body. Cage
should be installed with parts at lower end, near seat
ring. Tighten nuts (10) until metal to metal contact
is obtained with proper bolt torque. Refer to Figure
11 for proper bolt torque and tightening sequence
specifications.
G.
lnsert packing (6)
[and lantern ring (7) on valve equipped
with an optional lubricator or leak detection connection].
Refer to Section 7.6 for proper packing assembly procedure
for standard or optional designs.
H.
Install packing follower (5) and packing flange (4).
I.
Install packing flange stud nuts (3).
CAUTION
CAUTION
WARNING
DANGER
Do not overtighten (See Section “7.6. Packing Box”).
J.
If a leak detection connection was installed, connect it on
the lateral NPT port in the bonnet. If not, ensure that the 1/4"
NPT plug remained in place.
K.
For actuator assembly and plug stem adjustment, proceed
to the actuator instruction Ref. 19530 for a type 87/88
multispring actuator.
CAUTION
CAUTION
WARNING
DANGER
Do not over-tighten. Do not strike seat ring lugs
directly. This could distort the seat ring resulting in
unwarranted seat leakage.
D.
Carefully install plug and stem assembly.
Note:
Valve should be lapped before final assembly.
See Section 7.3.
E.
Install body gasket (11).
Note:
Spiral wound body gaskets (11) are standard in
the 21000 Series design. It is imperative that a new
gasket be installed each time the valve is disassembled.
F.
Assemble bonnet (8) and body stud nuts (10). Bonnet must
be positioned so the packing flange studs are at 90° to the
flow center line.
CAUTION
CAUTION
WARNING
DANGER
Tighten nuts (10) until metal to metal contact is
obtained with proper bolt torque. Refer to Figure
11 for proper bolt torque and tightening sequence
specifications.
G.
lnsert packing (6)
[and lantern ring (7) on valve equipped
with an optional lubricator connection].
Refer to Section
7.6 for proper packing assembly procedure for standard or
optional designs.
H.
Install packing follower (5) and packing flange (4).
I.
lnstall packing flange stud nuts (3).
CAUTION
CAUTION
WARNING
DANGER
Do not overtighten (See Section “7.6. Packing Box”).
J.
If a leak detection connection was installed, connect it on
the lateral NPT port in the bonnet. If not, ensure that the 1/4"
NPT plug remained in place.
K.
For actuator assembly and plug stem adjustment, proceed
to the actuator instruction Ref. 19530 for a type 87/88
actuator.
