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Baker Hughes
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XI. Inspection and Part Replacement (Cont.)
3. Disc Replacement Criteria, Figure 5 and Table 1
Disc should be replaced if:
a. Seat surface (Z) is nicked, or dimension (C)
is reduced to .025” (0.64 mm).
b. Spindle pocket surface (F) is pitted or galled,
it requires 63RMS finish.
c. Threads (T) are torn, galled or stripped.
d. Retainer Ring groove (E) is worn.
e. Disc height (H) exceeds minimum dimension.
f. Exceeds dimensions mentioned in Table 1
and Figure 5.
4. Disc Retainer Replacement criteria, Figure 5
Disc Retainer should be replaced if:
a. Overall condition is sprung or signs of
corrosion.
5. Guide Replacement Criteria, Figure 7 and
Table 3
Guide should be replaced if:
a. Inside diameter (A) exceeds maximum.
dimension or galled. It requires 32 RMS
finish.
b. Threads (T) should be replaced if torn, galled
or stripped.
c. Overall condition is distorted or egged.
d. Guide weld (W) is cracked weld or loose
guide.
Note:
Guide is tack welded to the bonnet, do not
attempt to remove from bonnet.
Table 3: Guide Critical Dimensions
Valve Size
A max.
in.
mm
in.
mm
.50
12.70
.722
18.34
.75
19.05
.960
24.38
1.00
25.40
1.200
30.48
1.50
38.10
1.917
48.69
2.00
50.80
2.459
62.46
W
A
T
Figure 7: Bonnet Assembly (For Guide)
