Masoneilan 39004 Series Butterfly Valve Instruction Manual | 4
Copyright 2020 Baker Hughes Company. All rights reserved.
Table 2 - Gland Retainer Nut and
Seat Retainer Screw Torque
Valve
Size
Gland Nut
Seat Retainer Screws
150
300
600
150
300
600
3
60
60
80
100
100
100
4
60
60
100
175
175
175
6
80
120
140
100
175
300
8
80
140
200
175
175
300
10
110
190
200
175
300
300
12
130
220
200
300
300
300
14
130
200
240
300
300
500
16
150
220
240
300
300
750
18
400
1500
20
480
1500
24
190
240
500
500
30
210
310
500
750
32
210
750
36
240
360
500
1500
40
280
420
500
1500
42
280
420
500
1500
44
420
1500
48
300
600
750
1500
54
360
1500
60
500
1500
5. Disc and Stem Replacement
Refer to drawing on page 5 for parts identification.
Note: Stem and disc are supplied as a matched set with
taper pins and are to be replaced as a set.
1. For handle-operated valves, loosen set screw (28) and
remove handle assembly (27). Remove socket head cap
screws (21) and lock washers (22). Remove mounting
bracket (20). For actuated valves, unbolt mounting bracket
from body and lift actuator assembly off stem. Note assembly
positions before removal.
2. Remove gland retainer nuts (14) and lock washers (13).
Remove gland retainer (11), anti-blowout retaining ring or
split ring (10) (depending on valve size), and gland ring (7).
3. Hook out stem seals (8) taking care not to scratch stem or
stuffing box bore.
4. Remove locating plug (19) and gasket (18).
5. Remove cap screws (17), seat retainer (16), and seat (15).
6. Turn disc to the full open position and drill out tack welds on
large end of taper pins (4). Take care to support valve so that
disc surfaces are not scratched. Drill sizes to remove tack
welds as given in Table 3.
7. Place valve in flat position, with flat face of disc up. Support
disc and body on wooden blocks to protect disc and body
surfaces. Disc will rest in partially open position.
8. Knock out taper pins (4) using a rod or punch on small end
of pin (opposite tack weld). It may be necessary to lift body
and rotate disc slightly to do this. Make sure disc is resting
on wood block since it will swing freely on stem with pins
removed. When pins (4) are out, lay body down so disc and
body are evenly supported on flat surface.
9. Using a brass bar or drift punch, knock stem (3) loose and
pull from body. After long or severe service this may take
considerable force. Be careful not to damage bearings,
spacers or body.
NOTE: Disc spacers (5) are used at top and bottom of
disc to properly position disc in body. Proper spacers
were selected at initial assembly and rarely require
replacement. The location of these spacers should
be noted, and the spacers marked at disassembly so
that they are reinstalled in the same positions, top and
bottom.
10. Separate body from disc, and remove thrust washer (9) from
packing bore.
11. Examine stem bearings (6) for excessive wear. If removed
from body, note position and mark to reinstall in same
location. Replacement is rarely needed, however, if bearing
liner is worn through to the shell, or severe damage is
evident they should be replaced.
12. Clean body thoroughly to remove all dirt, foreign matter,
rust, etc.
13. Place the body (1) flat, seat retainer side up, and support it
on wooden blocks sufficiently above the work surface as to
facilitate insertion of the disc (2) in open position. Lower the
disc into position, aligning the bores in body and disc.
14. Insert new stem (3) in body (1) with large end of the taper pin
holes toward the top. Assemble disc spacers (5) as stem (3)
is inserted, making sure that spacers are returned to original
locations as marked.
15. Align taper pin holes in disc and stem, and install taper pins
(4). Drive pins in tightly with rod or punch, and tack weld
each pin (4) to disc (2) at large end of pin.
16. Install new gasket (18) on locating plug (19) and install plug
in body.
17. Install new stem seals, following instructions in “Stem Seal
Replacement” section.
18. Install new seat, following instructions in “Seat Replacement”
section.
19. Remount handle assembly or actuator, and operate valve
several times to verify proper operation. Examine disc and
seat for any damage before reinstalling in line.
