22 | BHGE
© 2018 Baker Hughes, a GE company. All rights reserved.
XVI. Inspection and Part Replacement (MV) (Contd.)
Table 5: Dimension Chart
Orifice Size
A
+.003”/-.004
(+0.08 / -0.10 mm)
B
+.003”/- .004
(+0.08 / -0.10 mm)
C
± .005”
(± 0.13 mm)
D min.
E Radius
in
2
cm
2
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
114
735
12.847
326.31
12.758
324.05
12.055
306.20
.484
12.29
.029
0.74
143
923
14.347
364.41
14.258
362.15
13.505
±
.002
343.03
±
0.05
.484
12.29
.029
0.74
176 1135
15.847
402.51
15.758
400.25
15.005
381.13
.484
12.29
.029
0.74
200 1290
16.847
427.91
16.758
425.65
16.005
406.53
.484
12.29
.029
0.74
X
X
15
0
45
0
Ø C
Ø B
Y
Ø A
E RADIUS
15
0
FLAT WITHIN
.002” (0.05 mm)
T .I .R
1
D
D
Figure 15: Main Valve Seat Bushing
A. Repair of Main Valve Seat
If the seat bushing (2) seating surface must be replaced, the
base assembly must be set up on an appropriate machine
and the seat recut in accordance with the dimensions given
in Figure 15 and Table 5.
When indicated at surfaces X and Y, run out should not be
more than .004” (0.10 mm). All recut surfaces should be
finished to 63 RMS.
B. Replacement of Seat Bushing
Once dimension “D” minimum has been reached per Table 5,
seat bushing is in need of replacement. Contact the factory
for seat bushing replacement directions.
Note 1:
Total Indicated Runout.
