20 | BHGE
© 2018 Baker Hughes, a GE company. All rights reserved.
A. Disassembly of Main Valve
Refer to Figure 1 for the following:
1. Remove bonnet stud nuts (23) from studs (22).
2. Using a sling through the three eyebolts (26), Lift
Bonnet (19) vertically taking care not to bind bonnet
against stud bolts.
3. Remove Gasket.
4. Remove the Disc Spring (56) and Disc Spring Ring (57).
5. Fasten down Guide (8) with two Guide Retainer Tools
for disc removal, (Figure 12a), held in place with two
stud nuts, 180° apart. (BHGE Part No. 4215301). This
will hold the guide in place while the disc is removed.
6. Lift the disc vertically out of body.
7. Remove Guide Retainer Tools.
8. To remove the Main Guide (8), first remove the Upper
Backing Ring (9) from the guide. Using the tool shown in
Figure 12b (BHGE Part No. 4128201), rotate extension
rods until tips extend fully into the upper backing ring
groove. Each end of the engaging tips should be equally
spaced from the center of the lifting eye. The guide can
now be lifted out of body.
CAUTION
DO NOT TILT OR FORCE.
9. Remove the Lower Backing Ring (9) and "U" Ring Guide
Seal (13) from the grooves in the guide.
10. The Seat Bushing (2) is welded to the Main Base (1).
The seat bushing should only be removed if it must be
replaced.
XV. Disassembly of Main Valve
Figure 12a: Guide Retainer Tool for Disc Removal
Figure 12b: Guide Lifting Fixture and
Installation Tool
