Disassembly Of 4900 Series Pilot Valve; 49Pv07 And 49Pv37 - Baker Hughes Consolidated 4900 Series Instruction Manual

XVI. Disassembly of 4900 Series Pilot Valve
A. 49PV07 and 49PV37
1. Remove and discard the aluminum seals and
sealing wire.
2. Remove Cap (Compression Screw) by turning
counterclockwise.
3. If a lifting lever is installed, also use Figure 18 to
remove the Lifting Lever assembly. Then return
to Figure 17 to continue disassembly.
a. The Lifting Lever Assembly consists of:
1 – Lever
1 – Drive Pin
1 – Cam Shaft
1 – Bushing
b. Remove Lifting Lever Assembly by turning
Bushing counterclockwise.
c. Turn Cap (Compression Screw)
counterclockwise.
d. Measure distance from Release Lock Nut
to the top of the Lifting Stem for reassembly
later.
e. Remove the Release Lock Nut and Release
Nut by turning counterclockwise.
4. Measure and record Compression Screw height
for later use when resetting.
5. Turn Compression Screw Lock Nut
counterclockwise to loosen.
6. Turn Compression Screw counterclockwise to
remove the load on the Spring.
7. Turn Set Screw counterclockwise to loosen.
8. Bonnet can now be removed by turning
counterclockwise.
9. Spring and Spring Washers can now be
removed.
Note: If Lifting Lever option is equipped, there
is no need to remove Drive Pin from
Bottom Spring Washer assembly.
10. Remove the four Cap Screws (Top Plate)
holding the Top Plate to the Pilot Base. Remove
and discard the Spring Seal (Main Piston) and
O-Ring (Top Plate).
11. Remove Main Piston from Pilot Base.
12. Removing the Insert Assembly:
The Insert Assembly consists of:
1 – Insert Top
© 2020 Baker Hughes Company. All rights reserved.
(Figures 17 and 18)
13. Remove Adjuster Cap from the bottom of the
14. Loosen Adjuster Lock Nut by
15. Removing the Adjuster Assembly.
16. Turn Adjuster Assembly clockwise counting the
17. Remove Adjuster Assembly from the Pilot Base
18. Removal of the Backflow Preventer
1 – Insert Bottom
1 – Spring Seal (Insert)
1 – O-Ring (Insert)
Remove Insert Assembly from the top of the
Pilot Base with tool #4995401 as shown in
Figure 44.
Remove and discard the O-Ring (Insert) on the
bottom of the Insert Assembly. Disassemble
Insert Assembly by removing the Insert Bottom
from the Insert Top. Discard Spring Seal (Insert).
Pilot Base by turning counterclockwise.
turningcounterclockwise.
The Adjuster Assembly consists of:
1 – Adjuster Top
1 – Adjuster Bottom
1 – O-Ring (Adjuster Top)
1 – O-Ring (Adjuster Bottom)
1 – Spring Seal (Adjuster Top)
number of flats until assembly stops. Record
number of flats for reassembly.
by turning counterclockwise. Remove O-Ring
(Adjuster Top) and O-Ring (Adjuster Bottom)
from adjuster assembly and discard.
a. Disassemble Adjuster Top from the Adjuster
Bottom by turning Adjuster Top
counterclockwise. Remove Spring Seal
(Adjuster Top) from Adjuster Top and discard.
b. Remove Cap Screws counter clockwise to
allow the removal of the Port Adaptor.
c. Remove Ball, O-Ring (Ball Seat), Spring, and
O-Ring (Vent Port Assembly) and discard.
The Backflow Preventer consists of:
1 – Backflow Preventer Body
1 – Backflow Preventer Guide
1 – Ball
1 – O-Ring (Backflow Preventer) Small
1 – O-Ring (Backflow Preventer) Large
2 – O-Ring (Ball Seat)
1 – Pipe Plug (Backflow Preventer)
Consolidated 4900 MPV Series POSRV Manual
| 37