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Baker Hughes
© 2023 Baker Hughes Company. All rights reserved.
For coupling operations of actuators on valves, it is
necessary as a preliminary:
• to position the plug on its seat ring. (In no case, one
should not turn the plug on its seat, to avoid any
deterioration of tightness seat).
• connect a temporary air supply line to the actuator.
7. Actuation
Type 87/88 Multi-Spring Diaphragm
Actuators
Connecting Type 87 (Air to Extend) No. 6 Actuator (Figure 9)
1. Tightly assemble the hex nuts (1) onto the plug stem.
2. Push down the actuator, and screw on the yoke nut (33) at
the same time. Then assemble the bottom stem connector
(2). As soon as it becomes possible, insert the valve stem
into the actuator stem (10).The stem must be inserted far
enough so that when there is no air in the actuator, the
valve plug does not touch the seat.
3. Tighten the yoke nut (33).
4. Supply air to the actuator at the final pressure.
5. Use the pointer (7) to set the travel scale (9) to the valve
open position.
6. Supply the actuator with air at a sufficiently high pressure
to obtain a travel equal to the nominal travel of the valve.
7. Unscrew the plug stem until the valve plug is in contact
with the seat. Do not turn the valve plug on the seat as this
could damage the sealing surfaces.
8. Screw the hex nuts (1) as far as they will go and check that
operation is correct.
Connecting Type 88 (Air to Retract) No. 6 Actuator (Figure 9)
1. Tightly assemble the hex nuts (1) onto the plug stem.
2. Push down the actuator, and screw on the yoke nut
(33) at the same time. Then assemble the bottom stem
connector (2). As soon as it becomes possible, insert the
valve stem into the actuator stem (10).The stem must be
inserted far enough so that when there is no air in the
actuator, the valve plug does not touch the seat.
3. Tighten the yoke nut (33).
4. Unscrew the valve plug stem until the valve plug comes
into contact with the seat. Do not turn the valve plug on
the seat as this could damage the sealing surfaces.
5. Supply air to the actuator until the stem has travelled at
least .40 inches (10 mm).
6. Unscrew the plug stem by the number of turns N1
specified in Table 2.
7. Screw the hex nuts (1) as far as they will go and check
that operation is correct.
8. Use the pointer (7) to set the travel scale (9) to the valve
closed position.
Table 6 - Type 88 Actuator, Air to Open - Valve
Seating
Plug Stem
Diameter
N1 (turn) in
mm
1”
1.25
0.09
2.3
3/4”
1.25
0.08
2.0
5/8"
1.5
0.08
2.0
1/2”
1.5
0.075
1.9
Connecting Type 87 (Air to Extend) No. 10, 16 and 23
Actuators (Figure 9)
1. Tightly assemble hex nut (1) onto the plug stem.
2. Screw the top stem connector (4) assembly tightly onto the
actuator stem (10).
3. Push down the actuator, and screw on the yoke nut (33) at
the same time. Then assemble the bottom stem connector
(2) assembly by screwing until it comes into contact with
the hex nut (1).
4. Push down the actuator and tighten the yoke nut (33).
5. Supply the actuator with air at the initial pressure indicated
on the spring scale.
6. Position the stem connector assembly at distance “X”
indicated in Table 4.
7. Use the pointer (7) to set the travel scale (9) to the valve
open position.
8. Supply the actuator with air at a high enough pressure to
obtain a travel equal to the nominal travel of the valve.
9. With the plug correctly positioned on the seat, unscrew
the bottom stem connector (2) assembly until it comes into
contact with the top stem connector (4). Tighten the socket
head cap screws (5), hex nut (1) and lock nut (32) and
check that the operation is correct.
Connecting Type 88 (Air to Retract) No. 10, 16 and 23
Actuator (Figure 9)
1. Supply the actuator with air to retract stem.
2. Unscrew the top stem connector (4) in accordance with
dimension “X” in Table 5.
3. Tightly assemble hex nut (1) onto the plug stem
4. Tightly screw the top stem connector (4) assembly onto the
actuator stem (10).
5. Push down the actuator, and screw on the yoke nut (33) at
the same time. Then assemble the bottom stem connector
(2) assembly by screwing until it comes into contact with
the hex nut (1).
6. Push down the actuator and tighten the yoke nut (33).
7. With the plug correctly positioned on the seat, unscrew the
bottom stem connector (2) assembly to bring it into contact
with the top stem connector (4).
8. Supply air to the actuator until the stem has travelled at
least 0.40 inches (10 mm).
9. Unscrew the top stem connector (4) by the number of turns
N1 specified in Table 2 then lock manually with hex nut (1).
Summary of Contents for Masoneilan 41005 Series
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