Guide And Disc Assembly (4" L, M, N, P, Q, R, T, 3" F.b., 4" F.b, 6" F.b., 8" F.b., & 10" F.b.) - Baker Hughes Consolidated 4900 Series Instruction Manual

XV. Reassembly of 4900 Series Main Valve (Cont.)
7. Install Coverplate on top of Base such that
the vent port and dome port is on the outlet
side of the valve center line. Carefully lower the
Coverplate bolting and torque uniformly, making
sure that there is a uniform gap between the
Base and the Coverplate. Torque to the values
shown in Table 4 in 15 ft-lb (20 N-m) increments
making sure there is a uniform gap between
the Base and the Coverplate. Torque in the
sequence shown in Figure 16.
B.4 Guide and Disc Assembly
(4" L, M, N, P, Q, R, T, 3" F.B., 4" F.B,
6" F.B., 8" F.B., & 10" F.B.)
1. Make sure the chamfer on the TOP of the Guide
is smooth. If any sharp edges exist, polish the
chamfer, since the seal could be damaged
during assembly.
2. Drop Guide O-Ring into top of Base for outside
diameter of Guide.
3. Insert Guide into top of Base. It will not fit flush.
The Coverplate will force it down during its
installation.
4. Insert Disc Assembly into Guide with the Disc
seat going in first. Continue pushing Disc into
Guide, being careful of not pinching the Guide
Rings. Push Disc in until the Disc is in contact
with the Nozzle.
5. Install Coverplate O-Ring into top groove
on Guide.
6. Thread the Sensing Element into the bottom
of the coverplate. Torque to 50±5 ft-lbs
(67.8±6.8N-m).
36 |
Baker Hughes
7. Install Coverplate on top of Base such that
the vent port and dome port is on the outlet
side of the valve center line. Carefully lower the
Coverplate bolting and torque uniformly, making
sure that there is a uniform gap between the
Base and the Coverplate. Torque to the values
found in Table 4 using the torque patterns in
Figure 16 and Table 5.
3 1
3
4
Holes Holes
6
2 4
5
5 1
9
9
7
3
10
3 4
Holes Holes
12
8
10
8
2
2
6
Figure 16: Bolt Tightening Patterns
Table 5: Torque Required per Round
Round Percentage of Torque per Pattern Round
1
2
3
4
5
© 2020 Baker Hughes Company. All rights reserved.
1
1
5
5
3
6 8
Holes
7
4
2
6
2
6
1
1
9
16
7
14
11
11
4
12 16
7
Holes
4
12
13
10
15 10
6
2 5
Wrench Tight
25%
60%
100%
100%
8
4
8
3