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XV. Inspection and Part Replacement (Cont.)
Figure 26a: Type 1 (D-H Orifices)
A
Figure 26b: Type 2 (J-T Orifices)
A
Figure 26: Thermodisc
Table 7: Thermodisc Replacement Criteria
A min.
Orifice
in.
D
.006
0.15
E
.006
0.15
F
.006
0.15
G
.006
0.15
H
.006
0.15
J
.013
0.33
K
.014
0.36
machined. It can be lapped for minor scratches. If lapping
does not fix damaged area, part must be discarded.
10. Disc Holder: Disc Holder should be replaced if the sliding
surface of the Holder is galled, pitted, or scratched.
11. Solid Metal Gaskets: Solid Metal Gaskets can be reused
unless they are corroded, pitted, or crimped.
12. Main Valve Piston Replacement Criteria:
The Piston should be re-used if:
a. There is no indication of galling, scratched, corroded or
pitted on any surface of the piston.
b. The "B" & "E" dimensions (See Figure 27) are less than
"B" minimum and "E" minimum, indicated in Table 8.
38 | BHGE
C
B
C
B
A min.
Orifice
mm
in.
L
.014
M
.014
N
.014
P
.017
Q
.015
R
.015
T
.025
Figure 27a:
D-H Orifice
Table 8: Piston Critical Dimensions
mm
Orifice
0.36
0.36
D
0.36
E
0.43
F
0.38
G
0.38
H
0.64
J
K
L
M
N
P
Q
R
T
Replace all parts as needed. If any damage listed above
is present, the part should be replaced or repaired per
instruction. Other valve parts may be acceptable with light
corrosion, pitting, or minor damage of other types if it can be
determined that it will not affect product performance. All
O-Rings and seals should be replaced each time the valve is
disassembled.
Refer to Tables 20 for a list of recommended spare parts and
Table 21 for a list of O-Ring repair kits.
C
D
E
A
A
B
Figure 27b:
J-T Orifice
Figure 27: Main Valve Piston
B min.
in.
mm
.989
25.12
.748
.989
25.12
.748
.989
25.12
.748
1.114
28.30
.873
1.365
34.67
.998
1.677
42.60
1.310
1.990
50.55
1.623
2.490
63.25
2.123
2.867
72.82
2.498
3.117
79.17
2.748
3.741
95.02
3.372
4.861
123.47
4.498
5.735
145.67
5.372
7.360
186.94
6.997
© 2019 Baker Hughes, a GE company. All Rights Reserved.
C
D
E
B
E min.
in.
mm
19.00
19.00
19.00
22.17
25.35
33.27
41.22
53.92
63.45
69.80
85.65
114.25
136.45
177.72
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