Masoneilan 31000 Series Control Valve Instruction Manual | 4
Copyright 2020 Baker Hughes Company. All rights reserved.
6.2 Valve Body Disassembly
(Figures 1, 2, and 4)
1. Remove screws (17) and washers (18) and take off the
actuator connecting flange (12). In the case of models with
safety packing (Figure 4), remove the disk springs (24),
upper packing box ring (23), packing rings (21) and base
ring (20).
2. Release the packing follower (9) using the packing tool
(Figure 2).
3. Remove the body bolt (14, 15, 16). The bonnet (2) can now
be lifted off when the plug is in the fully open position. To
remove the plug (3), carefully pull downwards.
4. Remove the packing follower (9) together with the O-rings
(10 and 11), disk springs (8), lower packing box ring (7) and
packing (6).
5. Carefully push the seat ring (4) from the valve outlet side
into the inside of the body and remove; also remove the
O-ring (5) from the body (1).
Check all parts for condition and degree of wear.
Once the packing (6), has been dismantled, it must not
be reused. To ensure satisfactory sealing of the shaft,
use only new, original packings from the manufacturer.
It is strongly recommended that the complete packing
(6) including O-rings (10 and 11) and seat Oring (5) be
replaced each time the valve is disassembled. When
valves have safety packing (21), the replacement of the
packing rings and O-rings (25 and 26) is also required.
7. Reassembly
7.1 Valve Body S/A Reassembly
(Figures 1 to 4)
1. Insert the seat O-ring (5) into the body groove.
2. Slide in the seat ring (4) from the inside of the body into the
outlet side of the body with the shoulder of the seat facing
the body outlet port. Place the body on a bench. Put it where
its seat side flange contacts the cleaned surface of the
bench. Take care not to damage the sealing surface. The
inlet flange must be at the top. Using the seat assembly tool,
press the seat through the flange opening on the opposite
side until it seats securely on the shoulder. Remove the tool
after fitting.
Note: Refer to Figure 3 for the reference number of the seal
ring fitting tool.
3. Insert the plug (3) into the bottom guiding bore of the body.
4. Place the bonnet (2) over the plug shaft onto the body and
handtighten the bolting (14, 15, 16).
5. To insert the packing into bonnet (2), screw the guide tube
into the body (Figure 2) up to the stop. Insert the complete
packing (6) via the shaft end of the shaft into the guide tube
until the packing has been fully inserted. It is essential that
the packing is aligned in accordance with the detail drawing,
(Figures 1 and 4).
6. Insert the lower packing box ring (7) and using the assembly
tool (Figure 2) slide the packing into the bonnet up to the
stop. The packing is correctly positioned when the lower
edge of the groove of the assembly tool reaches the top of
the guide tube.
7. Insert the seven disk springs (8) in accordance with Figures
1 and 4 and unscrew the guide tube (Figure 2).
8. Insert the O-rings (10 inner, 11 outer) into the grooves of the
packing follower (9) and screw the packing follower in up to
its stop using the assembly tool (Figure 2).
If the control valve is equipped with a safety packing, insert the
base ring (20), three packing rings (21), upper packing box ring
(23) and three disk springs (24) in accordance with Figure 4.
9. Insert the wiper ring (13) into the actuator connecting flange
(12). When the actuator connecting flange has the grooves
option, the relevant O-rings (25 inner, 26 outer) are to be
inserted.
10. Slide the actuator connecting flange over the plug shaft and
secure it to the bonnet with screws (17) and washers (18).
11. After the assembly of the shaft seal has been completed,
tighten the bonnet bolts (14, 15, 16) to the required torques
given below in accordance with the nominal valve size.
Valve Size
Required Torques
N.m
Ft. Lb
1” (25 mm)
18
14
2” (50 mm)
25
19
3” (80 mm)
35
26
7.2 Actuator Reassembly
(Figures 5a, 5b & 6)
The assembly and setting of the actuator is made much easier
if the spring barrel (103) is first removed from the actuator yoke
(134). This is accomplished by removing the screws (101 and
102).
1. Insert the shaft bearing (125) and the grommet (129) into
the yoke (134).
2. Turn the plug to its closed position, hold the lever (135) in
position inside the yoke housing and slide the latter along
with the lever over the plug shaft.
