C. 39MV22/72 Disassembly
Figures 44, 45 and 42
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 42 to
remove the Lifting Lever assembly. Then return to
Figure 44 or 45 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), O-Ring (Top Plate) and
back-up rings (if applicable).
11. Remove Main Piston Assembly from Pilot Base.
12. Main Piston Assembly consists of:
1 – Main Piston
1 – Piston Nose
1 – Piston Retainer Nut
1 – Set Screw
Remove Set Screw. Turn Piston Retainer Nut
counterclockwise to remove. Remove Piston Nose.
Note: For Dirty Service Option, please refer to “Dirty
Service Option” (Section XXII.B) for disassembly
instructions.
13. Remove Spring Seal (Main Piston) and Backup Ring
(if applicable) and discard.
14. Removing the Insert Assembly.
The Insert Assembly consists of:
1 - Insert Top
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 81.
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).
15. Remove Adjuster Cap from the bottom of the Pilot
Base by turning counterclockwise.
16. Loosen Adjuster Lock Nut by turning
counterclockwise.
17. Removing the Adjuster Assembly.
The Adjuster Assembly consists of:
1 – Adjuster Top
1 – Adjuster Bottom
1 – Vent Seal Adaptor
1 – O-Ring (Adjuster Top)
1 – O-Ring (Adjuster Bottom)
1 – Spring Seal (Adjuster Top)
1 – Spring Seal (Adjuster Bottom)
18. Turn Adjuster Assembly clockwise counting the
number of flats until assembly stops. Record
number of flats for reassembly.
19. Remove Adjuster Assembly from the Pilot Base by
turning counterclockwise. Remove O-Ring (Adjuster
Top) and O-Ring (Adjuster Bottom) from adjuster
assembly and discard. Disassemble Adjuster Top
from the Adjuster Bottom by turning Adjuster Top
counterclockwise. Remove the Vent Seal Adaptor from
the Adjuster Top. Remove and discard the Spring Seal
(Adjuster Top) and Spring Seal (Adjuster Bottom).
20. Refer to Field Test Connection / Backflow Preventer
Option (Section XXII.A) for disassembly of Field Test
Connection.
XVII. Disassembly of Pilot Valve (Contd.)
Consolidated 2900 Series POSRV Maintenance Manual
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