Masoneilan 80000 Series control valve Instruction Manual | 5
Copyright 2020 Baker Hughes Company. All rights reserved.
Maintenance
Reassembly – 80385
1. Before seat rings are installed, the seating surfaces in the
body and bottom flange should be cleaned thoroughly. A
thread lubricant such as John Crane Insoluble Plastic Lead
No. 2 should be applied sparingly to the ring threads. The
seat rings (2) should be brought up tight using the seat
ring wrench. On ¾”–2” valves, tighten seat rings by hand
using a ring wrench with T-handle. Larger seat rings may be
tightened with a shock wrench.
Avoid overtightening. Excessive torque will distort
the seat ring with resulting leakage.
2. Install gasket (49) in the top of the valve body.
3. With valve sizes ¾”–6”, insert new packing in the bonnet,
just one ring of packing, then the lantern ring (16), then
more packing rings to fill the packing box. Replace packing
follower (10), packing flange (11) and packing flange nuts
(13). With 8” and 10” valves, install two packing rings, lantern
ring, more packing, packing follower, packing flange and
packing flange nuts after the bonnet has been assembled to
the valve body and the plug stem has been replaced in the
bonnet.
4. Install the bonnet (8) on the body and tighten nuts (48).
Tighten nuts evenly and in crisscross fashion to assure even
gasket compression.
5. Replace the plug and stem assembly in the body pushing
the plug stem through the packing box. If an 8” or 10” valve,
replace packing at this point.
6. Install gasket (49) and bottom flange (7). Tighten nuts (48)
evenly and in crisscross fashion to assure even gasket
compression.
7. Replace actuator on the valve and tighten drive nut (9). If an
air-to-retract actuator (38), apply air pressure to retract the
stem before installing actuator on the valve.
Disassembly – 80386
1. Apply sufficient air to the actuator to raise the plug so that
the bottom plug is just off the seat (2).
2. With smaller valves, loosen stem locknuts (27), turn them
down the plug stem (5) and lock them. With a wrench
applied over the locknuts, turn the plug stem out of actuator
stem. With larger valves, remove the split stem connector.
Remove locknuts (27) and travel indicator (58).
3. Unscrew drive nut (9) and remove actuator from the valve.
4. Remove nuts (48), bonnet (8), bottom flange (7) and body
gaskets (49).
5. Remove old packing (14) with lantern ring (16) from the top
of the bonnet.
6. Apply a wrench to the machined flats located on the upper
guide section of the plug to prevent the plug from rotating,
then remove plug locknuts (4N). Detach lower skirt (4L) and
plug gasket (4G). Remove upper skirt (4U) and shank (4SK)
from the valve body.
Note: The upper skirt (4U) is welded to the shank (4SK).
Examine plug and seat rings for wear and grind the
seating surfaces (see Pages 7 and 8) if necessary.
7. For seat ring removal, refer to Step 9 of Disassembly –
80385.
Reassembly – 80386
1. Install seat rings per Step 1 of Reassembly – 80385.
2. Reassemble the upper skirt (4U) and shank (4SK), gasket
(4G), lower skirt (4L), and plug locknuts (4N) in the valve
body.
3. Replace gasket (49), bottom flange (7) and tighten nuts
(48).
4. To replace packing (14) in the bonnet (8), refer to Step 3 of
Reassembly – 80385.
5. Install the bonnet on the body and tighten nuts (48). Tighten
nuts evenly and in crisscross fashion to assure even gasket
compression.
6. Replace actuator on the valve and tighten drive nut (9). If an
air-to-retract actuator (38), apply air pressure to retract the
stem before installing actuator on the valve.
Plug Stem Adjustment
Size 9, 11 and 13 Actuators
1. Push plug stem (5) down until the plug seats and replace
locknuts (27) and travel indicator (58) (and locking plate (55)
on Size 13 actuators).
2. Air-to-extend actuator: Turn plug stem (5) into actuator stem
until seating occurs. Apply sufficient air pressure to move
the plug slightly. Turn plug stem one additional turn into the
actuator stem and tighten stem locknuts (27).
Note: Do not turn the plug when it is in contact with the
seat or scoring will result. If necessary, adjust travel
indicator scale (56).
3. Air-to-retract actuator: Turn plug stem (5) into actuator stem
as far as it will go and release air pressure to the diaphragm.
Turn plug stem out of actuator stem until plug is seated.
Note: Do not turn the plug when it is in contact with
the seat or scoring will result. Apply sufficient air
pressure to move the plug up. Turn the plug stem out of
the actuator stem one full turn and tighten locknuts. If
necessary, adjust travel indicator scale (56).
Plug Stem Adjustment
Size 15 and 18 Actuators
1. Push plug stem (5) down until the plug seats.
2. If an air-to-extend actuator (37), apply air pressure to extend
the actuator stem to rated stroke. If an air-to-retract actuator,
apply air pressure to retract the actuator stem approximately
1/16”.
3. Install stem clamp (51) and travel indicator pointer (58A).
Tighten clamp nut (53). It may be necessary to raise or lower
the actuator stem slightly to mate the threads of the actuator
and plug stems with the clamp. The amount of thread
engagement of both stems should be approximately equal.
If necessary, adjust travel indicator scale (56).
