Masoneilan 77000 Series Control Valves Instruction Manual | 7
Copyright 2021 Baker Hughes Company. All rights reserved.
4. Align the bottom entry spool (2) section bolt holes with the
body studs (9). Proceed to the bolting instructions.
For Top Entry 77001 Series Designs follow disassembly
instructions 5-11:
5. Assemble the lower spider gasket (7) into the valve body.
6. Assemble the lower guide bushing (35) onto the spider (4)
pressing down until contact is made.
7. Assemble the upper spider gasket (8) onto the spider (4) and
install into the body (1) making sure that it aligns correctly on
top of the lower spider gasket (7) located in the body.
8. Assemble the plug stem (5) into the seat ring (3). Using the
plug stem carefully lower the parts together into the valve
body until they rest on the spider (4). The seat ring should
mechanically fit on to the liner with a stepped connection.
Be careful not to damage the plug stem (5) or the
seat ring (3) while removing these parts from the
body. Scratches or damage to these parts can
result in leakage and premature wear.
9. Lower the seat ring retainer (33) over the plug stem (5) onto
the seat ring (3).
10. Install the bonnet gasket (34) onto the body (1).
11. Press the upper stem guide bushing into the bonnet (2)
and align the bonnet (2) bolt holes with the body studs (9).
Proceed to the bolting instructions.
Body Bolting
1. Grease the threads of the valve body studs (9) and the
bearing surfaces of the bonnet or spool nuts (10).
2. Assemble the bonnet or spool nuts (10) onto the body studs
(9) manually, and hand tighten evenly so that the internal
parts are held in place. The face of the bonnet or spool
should be parallel to surface of the valve body (1).
3. Tighten the bonnet or spool nuts (10) evenly by applying
torque in the increments and the sequences as defined in
Table 1 and Figure 3.
Note: To ensure tightness of the gasket joints torque
the bonnet or spool down until metal to metal contact
exists between the body and mating part.
4. Check the plug stem (5) in between various tightening steps
to make sure it is not binding due to misalignment of the
trim. If there is binding, disassemble the bonnet or spool and
reassemble the trim taking care to ensure proper alignment.
Note: Tighten the bonnet or spool nuts (10) in the
following increments (units of ft-lbs [daNm]): 10 [1.3], 20
[2.6], 40 [5], 75 [10], 140 [19], 225 [30], 400 [54], 650 [88],
plus increments of 250 [34] until the required torque is
reached. Between each pass check to make sure the
plug stem (5) strokes freely to ensure proper alignment.
5. Visually inspect the assembly for proper stud and nut
installation by checking the number of exposed threads. If
less than 1 stud thread or more that 2-1/2 stud threads are
extended above the nut after final tightening, then double
check the assembly for proper installation and alignment.
Valve Size
Bolting
Size
Torque Requirements ft-lbs [daNm]
Inches DN
A193 Gr.
B7M
A453
Gr. 660
A193
Gr. B7/B16
1
25
.750-10UNC
60 [8]
65 [9]
75 [10]
1.000-8UNC 140 [19]
150 [20]
170 [23]
2
50
1.250-7UNC 290 [39]
310 [42]
360 [49]
1.500-8UN
540 [73]
575 [78]
680 [92]
3
80
1.500-8UN
540 [73]
575 [78]
680 [92]
4
100
1.750-8UN 1100 [149]
985 [134]
1100 [149]
2.000-8UN 1300 [176] 1385 [188] 1700 [230]
6
150
1.875-8UN 1100 [149]
985 [134]
1100 [149]
2.000-8UN 1300 [176] 1385 [188] 1700 [230]
2.500-8UN 2680 [363] 2855 [387] 3350 [454]
8
200
2.000-8UN 1300 [176] 1385 [188] 1700 [230]
2.250-8UN 1925 [261] 2050 [278] 2405 [326]
Table 1: Body Bolting Torque Requirements
For 77001 and 77002 only
Figure 3: Bolt Torque Sequence
