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657 Size 80 and 100 Actuators
Instruction Manual
Form 1909
August 2006
8
Table 2. Maximum Torque Values
DIAPHRAGM MATERIAL
INITIAL TORQUE
NSm (lbfSft)
FINAL TORQUE
NSm (lbfSft)
EPDM/Meta-Aramid 41 (30) 82, +/−13 (60, +/−10)
Nitrile, Silicone, FKM/Meta-Aramid 34 (25) 68 (50)
7. Insert the cap screws (key 22) into the diaphragm
casing, and tighten the hex nuts (key 23) in the
following manner. The first four hex nuts tightened
should be diametrically opposed and 90 degrees
apart. Tighten these four hex nuts to the initial torque
value found in table 2 for the diaphragm material
being used.
8. Tighten the remaining hex nuts in a clockwise,
criss-cross pattern to the initial torque value found in
table 2 for the diaphragm material being used.
9. Repeat this procedure by tightening four hex
nuts, diametrically opposed and 90 degrees apart, to
the final torque value that is specified in table 2 for
the diaphragm material being used.
10. Tighten the remaining hex nuts in a clockwise,
criss-cross pattern to the final torque value that is
specified in table 2 for the diaphragm material being
used.
11. After the last hex nut is tightened complete
another tightening sequence, this time in a circular
pattern around the bolt circle to the final torque value
that is specified in table 2 for the diaphragm material
being used.
12. Once completed, no more tightening is
recommended.
13. Mount the actuator on the valve in accordance
with the procedures in the Installation section.
Size 100 Disassembly
Key numbers used in the following procedure are
shown in figure 5 except when indicated.
Note
Two construction variations of the size
100 are based on spring length. Group
1 springs have a free length of 845 mm
(33-1/4 inches), and group 2 springs
have a free length of 419 mm (16-1/2
inches).
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 1, below), and
carefully remove casing cap screws (key
22) (step 7, below).
1. Remove shroud plate (key 107), loosen jam nut
(key 115), and rotate adjusting nut (key 114) until
spring compression is relieved.
Note
To relieve spring compression when
high spring forces exist, refer to the
Adjusting Actuator Spring section, and
follow the instructions given for size
100 actuators with high spring forces.
2. Remove the pressure tubing or piping from the
top of the diaphragm casing.
3. For actuators with top-mounted handwheel,
rotate handwheel (key 51, figure 8) counterclockwise
as far as it will go, unscrew cap screws (key 109,
figure 5), and remove handwheel and gear case
assembly (key 65, figure 8).
4. For actuators without top-mounted handwheel,
unscrew cap screws (key 109), and remove
diaphragm casing cover (key 123).
5. If necessary, remove the actuator from the valve
body by separating the stem connector (key 26) and
removing the actuator-to-bonnet bolting. Separate
the stem connector by loosening the stem locknuts
(key 16) and unscrewing the four cap screws.
6. Unscrew and remove actuator stem extension
(key 116).
7. Unscrew cap screws (key 22), and remove upper
diaphragm casing (key 1).
8. Remove backup plate, diaphragm retainer,
diaphragm, diaphragm plate, and washer (keys 13,
110, 2, 4, and 117).
9. Unscrew the nuts that attach lower diaphragm
casing (key 5) to actuator tie rods (key 21).
10. Remove lower diaphragm casing from tie rods
and remove hex jam nut, adjusting nut thrust bearing