Masoneilan 39004 Series Butterfly Valve Instruction Manual | 6
Copyright 2020 Baker Hughes Company. All rights reserved.
Special Instructions For Fire
Safe Butterfly Valve
1. Installation
1. The Fire Safe 39004 Series valve will provide fire-safe
shutoff with flow in either direction, meeting API 607 and
British Standard 6755 part 2 criteria, as well as bubble-
tight shutoff in either direction in normal service. However,
installation with the seat retainer upstream provides
maximum protection to the soft seat, and will increase seat
life, especially in erosive services.
2.
Installation bolting information and dimensional data given
for the standard Masoneilan valves is also applicable to the
Fire Safe versions.
2. Stem Seal Replacement
The procedure for replacement on page 3 also applies to Fire
Safe valves, with the following exceptions:
1. Graphite stem seals are used in the Fire Safe valves. The
arrangement of the two types of stem seals when installed
is: bottom seal carbon fiber braided ring; center seals –
graphite rings; top seal carbon fiber braided ring.
2. Table 4 shows stem seal quantities for class 150 and
300 valves.
Table 4 - Total Number of Stem Seals
CF = Carbon Fiber
G = Formed Graphite
Valve
Size
Class 150
Class 300
Class
600
Gland Nut
Torque
Number
of Stem
Seals
Material
CF / G
Number
of Stem
Seals
Material
CF / G
Class
150
Class
300
3
4
2 / 2
4
2 / 2
NO
FIRE
SAFE
VER-
SION
35
45
4
4
2 / 2
4
2 / 2
35
45
6
4
2 / 2
4
2 / 2
45
65
8
5
2 / 3
5
2 / 3
45
80
10
5
2 / 3
5
2 / 3
65
100
12
5
2 / 3
5
2 / 3
65
100
14
6
2 / 4
8
2 / 6
80
125
16
6
2 / 4
9
2 / 7
100
150
18
9
2 / 7
9
2 / 7
100
150
20
9
2 / 7
9
2 / 7
100
150
24
10
2 / 8
8
2 / 6
150
200
3. Seat Replacement
1. With the disc in the closed position, remove the valve from
the line.
2. Lay the valve down with the disc in the closed position and
the seat retainer side facing up.
3. Remove socket head cap screws, seat retainer, metal fire
seat, gaskets, and soft seat.
4. Carefully remove graphite gaskets from metal seat. Do not
bend or crimp metal seat. All traces of the old gaskets must
be removed.
5. Clean seat retainer and body surfaces to remove any
adhering gasket material, corrosion, or other foreign
material. Examine disc seating surfaces for damage, and
examine seating surface of metal seat for wear or damage.
Replace if damaged.
6. Place new seat on disc, carefully centering in body recess.
7. Place new graphite gasket on the body. Position metal seat
over the disc, lip facing out, on top of the polymer seat. Place
another graphite gasket on top of the metal seat. Graphite
gaskets can be first attached to the metal seat to simplify
the assembly. Spray a suitable adhesive, like 3M Super
77™ general purpose adhesive or similar, in 3 or 4 spots on
both sides of the metal seat to hold the gaskets in position.
Handle the gaskets carefully as they are very thin and are
easily torn or scratched.
8. Align holes in seat retainer with holes in body and seat,
and carefully place seat retainer in position, on top of seat.
Be careful that seats do not shift when retainer is installed.
Lightly grease cap screw threads and tighten down evenly in
a criss-cross pattern to assure proper centering and uniform
compression. Torque cap screws to the values given in
Table 2 on page 4.
9. Lubricate the disc edge with molybdenum disulfide spray or
similar lubricant, if available. As a minimum, lubricate the
disc edge with light machine oil or light grease. Operate
valve several times and examine seat for damage before
reinstalling in line.
4. Stem and Disc Replacement
The same procedures apply to Fire Safe valves as to the
standard valves, with the addition of the special requirements for
stem seal and seat replacement.
5. Field Adjustments – All Valves
Stem Seal Leakage
Should leakage occur at the stem seals, it may be stopped by
retightening the gland retainer nuts to the values specified in
Tables 2 or 4. Do not overtighten gland nuts, as this may cause
increased operating torque, and improper valve operation or
closure. If the leakage cannot be stopped by this action, the stem
seals require replacement.
Adjusting Valve Closure
Valves with gear actuators or electric / pneumatic actuators may
require adjustment of the travel stops in the actuator to properly
close valve for tight shut-off. The following procedure should be
followed to set travel or limit stops. (It is recommended that the
valve must be removed from line for this procedure and actuator
mounting).
1. Using a straight-edge and vernier or depth caliper, measure
the distances from the face of the seat retainer to the disc
(valve closed) face at the 3 o’clock and 9 o’clock positions
(stem is at 12 o’clock position). The measurements must
agree within 1/16” (0.062”).
