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SS-264 Valve
September 2021
14. Lubricate with Nuclear Grade anti-seize lubricant (key 36) and install the fourteen 2-1/2-8x12.50 body-to-bonnet
studs (key 10) down to the deformed thread into the valve body (key 12).
Note
If the ball/shaft assembly (key 8), drive bearing (key 2), or bonnet (key 5) are new or replacement parts, then a new special thrust
washer (key 28) must be ordered. All four of the components are a matched set and ensure proper vertical alignment of the ball
with the seal. Contact your
Washer Dimension Check Instructions above.
15. Install the spiral wound gasket (key 3) into the groove on top of the valve body (key 12).
16. Carefully lower the bonnet (key 7) over the drive shaft, ensuring the alignment pin hole of the bonnet (key 7) is
guided over the alignment pin of the valve body (key 12).
17. Lubricate the threads and seating surface of the fourteen 2-1/8 UNC-2B body-to-bonnet heavy hex nuts (key 17)
with Nuclear Grade anti-seize lubricant (key 36) and install onto each stud (key 10).
18. Using 2 torque wrenches follow the torque steps in table 4 up to an initial torque value of 6,780 N•m (5,000 ft•lbf)
by torquing 2 opposing studs simultaneously. Recommend using a hydraulic torque wrench with multiple
actuator/hose connections. Complete torque steps per tables 8, 9, and 10.
A four-stud pattern can also be used per table 4 if there is an available hydraulic torque wrench with the required
number of actuators/fittings to achieve 4 simultaneous torque outputs.
Note
Recommend using a chloride-free marker to track the steps and sequences of the torquing procedure, and/or use tables 8, 9, and
10 to track the steps and sequences.
Table 4. Body-To-Bonnet Stud Torquing Procedure
Two-Stud Sequence
Four-Stud Sequence
Per Step
1 and 2
3 and 4
5 and 6
7 and 8
9 and 10
11 and 12
13 and 14
19. Individually torque all nuts to 9,356 N•m (6,900 ft•lbf) and then to a final torque of 10,970 N•m (8,090 ft•lbf) per
tables 9 and 10. Tighten the bolted joint using a criss-cross pattern shown in figure 10. Tighten each bolt evenly and
in the sequence described.
16
Emerson sales office
for assistance with procuring a new special thrust washer. Use section Thrust
Torque Step
Per Step
1, 2, 3, and 4
5, 6, 7, and 8
9, 10, 11, and 12
13 and 14
N•m
1
698
2
1397
3
2095
4
4407
5
6780
Instruction Manual
Stud Torque
Ft•lbf
515
1030
1545
3250
5000
D103565X012
% Nominal Torque
6
13
19
40
60
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