Masoneilan 77000 Series Control Valves Instruction Manual | 13
Copyright 2021 Baker Hughes Company. All rights reserved.
77003 Series Disassembly
Valve Disassembly
Refer to Figures 14 & 15 for disassembly and
assembly.
Actuator and Linkage Disassembly
1.
Remove linkage snap rings (A900) & (A900a) from both ends
of bracket link pins (A090) and actuator link pins (A090b).
2. Remove clevis cap screw (A915) from valve stem clevis
(A033).
3.
Disconnect actuator connector (A044) and actuator link arms
(A734a) by removing qty 2 of 2 actuator link pins (A090b).
4. Disconnect the valve stem clevis (A033) from main lever arm
(A026) by removing qty 2 of 2 valve link pins (A090a).
5. Disconnect actuator link arm (A734a) from main lever arm
(A026) by removing qty 1 of 2 valve link pins (A090a).
6. Disconnect main lever arm (A026) from valve link arm (A734)
by removing qty 1 of 2 valve link pins (A090a).
7.
Disconnect valve link arm (A734) from bracket body (A035)
by removing bracket link pin (A090).
8.
Remove actuator spud adapter (A060) from bracket body
(A035) by removing actuator bolts (A915a).
9. Dismount actuator.
10. Remove valve stem clevis (A033) from plug stem (B122).
11.
Remove bracket body (A035) from bonnet flange (B003) by
removing cap screws (A915b).
Bonnet/Trim Disassembly
1.
Remove the Packing Nuts (B201), Packing Flange (B213),
and Packing Follower (B212).
2.
Remove the Bonnet Nuts (B014) by un-torqueing them in
stages to equally unload the bonnet and trim gaskets. When
the Bonnet Nuts are removed, while pressing down on
the stem, remove the Bonnet (B003) from the valve body.
Once Bonnet is removed, be certain to sit loose Bonnet
on a surface that does not damage critical internal sealing
surfaces. While removing the Bonnet, the Packing Set
(B207) may also pull away from the stem. The Packing Set
should be removed at this time and discarded.
3.
Remove Body Gasket (B105) and discard after examination.
4.
Remove Stem Bushing (B011) and Retainer (B107).
5.
Attach a lifting mechanism to the Plug and Stem Sub-
assembly (B122), and remove the Plug and Stem Sub-
assembly and the Liner/Seat (B106) from the valve body in
a single lifting operation.
6.
For the 77003 Series 5-Stage Partially Balanced (Trim
X), reach into the valve body and lift out the Liner Spider
(B106A).
7.
For the 77003 Series 3-Stage Unbalanced (Trim Y), reach
into the valve body and lift out the Spacer (B127).
8. Make certain to remove both Trim Gaskets (B103) noting
that one may be attached to the Liner Spider and one may
remain inside the valve body.
77003 Series Maintenance &
Repair
Parts Repair
Carefully examine parts for any scratches, unusual wear, or
other visual damage prior to reassembly. Always clean trim parts
before reinstalling in the valve.
Guiding Surfaces
Guiding surfaces include the following parts:
For the 77003 Series 5-Stage Partially Balanced (Trim X):
Stem Bushing (B011)
Liner Spider (B106a).
Plug and Stem Sub-assembly (B122)
For the 77003 Series 3-Stage Unbalanced (Trim Y):
Stem Bushing (B011)
Plug and Stem Sub-assembly (B122)
Liner/Seat (B106)
These guiding parts must be checked. If there is only slight wear
indications, then use a light abrasive to smooth out the specific
guiding surface areas. Parts with greater damage or wear on the
guide surfaces must be replaced. Guiding surfaces are hard-
coated and excessive removal of surface material can expose
base material.
Seating Surfaces
Seating surfaces are found on the Plug and Stem Sub-
assembly (B122) and Liner/Seat (B106). These surfaces must
be completely free of dents, scratches, wear, or other visual
damage. If the valve demonstrates excessive leakage or shows
signs of deterioration on the seating surfaces the parts may be
refurbished in accordance with the following guidelines
