10 | Baker Hughes
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During this operation, make sure the plug does not turn
when it is seated. If the plug travel is very small and
there is a large amount of plug stem inside the actuator,
it may be necessary to remove the yoke nut and lift the
actuator so that the plug is not touching the seat.
Refer to the appropriate instruction manual for the
actuator and each unique accessory.
For configurations designed with a two piece bonnet
(bonnet and bonnet flange):
3. Assemble the bonnet (2) over the valve stem (7) and push
it down carefully. Be careful not to damage the stem during
the assembly process.
4. Place the metal seal (6) over the bonnet (2) and press the
metal seal down into the groove formed between the body
and the bonnet.
5. Assemble the bonnet flange (3) over the bonnet (2) and
align the bolt holes with the body studs (4). Make sure
the bonnet flange is also aligned with the metal seal (6).
Proceed to Step 8.
For trim configurations designed with a single piece bonnet:
6. Assemble the bonnet (2) over the valve stem (7) and push
it down carefully to align the bolt holes with the body studs
(4). Be careful not to damage the stem during the assembly
process.
7. Install body gasket (25) on to the groove on top of the valve
body (1).
8. Grease the threads of the valve body studs (4) and the
bearing surfaces of the body stud nuts (5).
9. Assemble the body stud nuts (5) manually. Hand tight-en
the nuts evenly so the internal parts are held in place. The
face of the bonnet should be parallel to the upper face of
the valve body.
10. If applicable, slide the guide bushing (20) onto the valve plug
stem (7) and let it drop to the bottom of the packing box.
Tightening Body Nuts
In order to achieve perfect alignment of the body and the internal
components, it may be beneficial to provide loading to the
plug stem assembly (8) during tightening. This may benefit the
positioning of various parts in installations where the actuator
and trim are installed horizontally.
The force can be applied with the actuator as follows:
Place the actuator on the valve bonnet (2) by means of the yoke
nut (29) or bolted connections and connect the valve plug stem
(7) to the actuator stem.
Tighten the body nuts (5) evenly by applying the torque
indicated on the valve assembly drawing (typical torque values
are provided as references in Table 2) consult factory for other
arrangements not shown on the table. Use the tightening
sequence as indicated in Figure 9.
Packing Box Assembly
Assemble the packing box components per the maintenance
instructions in the Packing Box maintenance procedure on Page 6.
Bolt Torque Sequence
Figure 8 details the tightening sequence for the bonnet/body bolts
torques for a 72000 Series. Evenly apply torque to the amount
indicated on the valve assembly drawing (typical torque values
for SA193 B7, SA193 B7M, and SA193 B16 bolting materials are
provided as references in Table 2).
Figure 9 - Bolt Torque Sequence
Table 2 - Body/Bonnet Bolting Torque
TORQUE
Body/Bonnet Bolting Requirements
Valve Size
Body Nuts
Assembly Torque
Nominal
size
(in)
Pressure
rating
Size
(in)
Quantity
ft.lb
N.m
3
150/300
3/4 10
8
133
180
600
3/4 10
8
163
220
900
1 1/4 8
6
563
760
1500
1 1/4 8
6
815
1100
4
150/300
7/8 9
8
170
230
600
7/8 9
8
259
350
900
1 1/2 8
6
889
1200
1500
1 1/2 8
6
1370
1850
6
150/300
1 8
8
326
440
600
1 8
12
237
320
900
1 3/4 8
8
1370
1850
1500
1 3/4 8
8
1370
1850
8
150/300
1 1/4 8
8
526
710
600
1 1/4 8
12
481
650
900
1 3/4 8
8
1370
1850
1500
1 3/4 8
8
1778
2400
10
150/300
1 1/2 8
8
852
1150
600
1 1/2 8
12
852
1150
900
1 3/4 8
12
1370
1850
1500
1 3/4 8
12
1630
2200
12
150/300
1 1/2 8
8
926
1250
600
1 1/2 8
12
852
1150
900
1 1/2 8
16
926
1250
1500
1 3/4 8
16
1630
2200
16
150/300
1 1/2 8
12
852
1150
600
1 1/2 8
16
826
1250
900
1 1/2 8
20
1111
1500
1500
1 3/4 8
20
1926
2600
