Instruction Manual
D100306X012
657 Actuator (30/30i-70/70i and 87)
June 2018
19
15. Position the upper diaphragm casing (key 1) onto the diaphragm (key 2) and align the holes.
Note
When you replace actuator diaphragms in the field, take care to ensure the diaphragm casing bolts are tightened to the proper
load to prevent leakage, but not crush the material. Perform the following tightening sequence with a manual torque wrench for
size 30‐70, 30i-70i, and 87 actuators.
CAUTION
Over‐tightening the diaphragm casing cap screws and nuts (keys 22 and 23) can damage the diaphragm. Do not exceed 27
N
S
m (20 lbf
S
ft) torque.
Note
Do not use lubricant on these bolts and nuts. Fasteners must be clean and dry.
16. Insert the cap screws (key 22), 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 13 N
S
m (10 lbf
S
ft).
17. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to 13 N
S
m (10 lbf
S
ft).
18. Repeat this procedure by tightening four hex nuts, diametrically opposed and 90 degrees apart, to a torque of 27
N
S
m (20 lbf
S
ft).
19. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to 27 N
S
m (20 lbf
S
ft).
20. After the last hex nut is tightened to 27 N
S
m (20 lbf
S
ft), all of the hex nuts should be tightened again to 27 N
S
m (20
lbf
S
ft) in a circular pattern around the bolt circle.
21. Once completed, no more tightening is recommended.
22. Mount the actuator onto the valve, following the procedures in the Installation section.
23. Return the actuator to service after completing the Loading Connection procedure in the Installation section and
the procedures in the Adjustments section.
Casing‐Mounted Adjustable Travel Stops
Note
If repeated or daily manual operation is expected, the actuator should be equipped with a manual top‐mounted or side‐mounted
handwheel. Refer to the Top‐Mounted Handwheel and Side‐Mounted Handwheel sections of this instruction manual.
The casing‐mounted adjustable up travel stop (figures 18 or 19) limits the actuator stroke in the upward direction. To
adjust, first relieve actuator loading pressure before removing the travel stop cap (key 187, figure 18 or 19). Loosen
the travel stop nut (key 137). Then turn the travel stop stem (key 133) clockwise into the diaphragm case to move the
actuator stem downward (or counter‐clockwise to move the stem upward). Finally, tighten the travel stop nut and
replace the travel stop cap.
