Actuation; Type 87/88 Multi-Spring Diaphragm Actuators - Baker Hughes Masoneilan 77000 Series Instruction Manual

Actuation

Type 87/88 Multi-Spring Diaphragm
Actuators
Connecting Type 87 (Air to Extend) No. 6 Actuator (Figure
10)
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 10)
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 3.
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.
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Connecting Type 87 (Air to Extend) No. 10, 16 and 23
Actuators (Figure 10)
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 10)
1. Supply the actuator with air to retract stem.
2. Unscrew the top stem connector (4) in accordance with
dimension "X" in Table 4.
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 3 then lock manually with hex nut (1).
10. Release the pressure in the actuator. Use pointer (7) to set
the travel scale (9) to the actuator supply pressure so that
the two stem connectors come into contact. Then tighten the
socket head cap screws (5), hex nut (1), and lock nut (32).
11. Shut off the closed valve pressure and check that operation
is correct.
Masoneilan 77000 Series Control Valves Instruction Manual | 13