Emerson Fisher 657 Instruction Manual page 12

657 Actuator (30/30i-70/70i and 87)
June 2018
WARNING
To avoid personal injury from the precompressed spring force thrusting the upper diaphragm casing (key 1) away from the
actuator, relieve spring compression (step 2, below), and carefully remove casing cap screws (key 22) (step 4, below).
2. Thread the spring adjuster (key 12) out of the yoke (key 9) until all spring compression is relieved.
3. If required, remove the actuator from the valve body by separating the stem connector (key 26) and removing the
yoke locknut or, for the size 87 actuator, the stud bolt nuts. Separate the stem connector by loosening the stem
nuts (keys 15 and 16) and unscrewing the two cap screws.
4. Remove the diaphragm casing cap screws and nuts (keys 22 and 23), then lift off the upper diaphragm casing
(key 1).
5. Remove the actuator diaphragm (key 2).
6. Remove the diaphragm plate, actuator stem, and cap screw (keys 4, 10 and 3) as an assembly. This assembly can be
broken down further, if required, by removing the cap screw (key 3).
7. Remove the actuator spring (key 6) and the spring seat (key 11).
8. If required, remove the lower diaphragm casing (key 5) from the yoke (key 9) by loosening the cap screws (key 8)
that hold it in place.
9. If required, remove the spring adjuster (key 12) by unscrewing it from the yoke (key 9).
Table 2. Actuator Assembly Recommended Torque Values
DESCRIPTION, KEY NUMBER
Diaphragm plate to stem, key 3
MO U-bolt, key 170
MO U-bolt, key 147
MO U-bolt, key 144
(1)
Diaphragm casing, key 23
Hex cap screw,key 256
Hex cap screw,key 257
Casing to yoke, key 8
Top-mounted handwheel and
travel stop mounting, key 141
(2)
Stem connector, key 26
1. Observe tightening pattern and procedure described in the appropriate Actuator Assembly section.
2. Torque values when lithium grease is used on the threads.
Actuator Assembly
Refer to table 2 as appropriate.
1. Coat the threads and the spring seat bearing surface of the spring adjuster (key 12) with lithium grease (key 241),
and thread the spring adjuster into the yoke (key 9). Place the spring seat (key 11) in the yoke on the spring adjuster
and turn the spring adjuster to ensure that threads are properly engaged.
12
ACTUATOR SIZE THREAD SIZE, INCH
30/30i
34/34i and 40/40i
45/45i to 70/70i and 87
34 and 40
45 to 60
34 and 40
45 to 60
30/30i to 70/70i and 87
34i to 40i
45i to 60i
34i to 60i
30/30i to 60/60i
70/70i and 87
30/30i to 60/60i
30/30i through 40/40i
45/45i through 70/70i
87
N•m
3/8-24
1/2-20
3/4-16
1/2-13
5/8-11
3/8-16
3/8-16
3/8-24
1/2-13
5/8-11
3/8-16
3/8-16
1/2-13
3/8-16
5/16-18
3/8-16
1/2-13
Instruction Manual
D100306X012
TORQUE
Lbf•ft
41 30
54 40
149 110
81 60
163 120
41 30
41 30
27 20
92 68
163 120
39 29
39 29
92 68
39 29
23 17
39 29
91 67