Emerson Process Management FISHER 657 - Manual (Page 17)

Instruction Manual
D100306X012
657 Actuator (30-70 and 87)
December 2010
17
12. Put the spring seat and actuator spring (keys 11 and 6) into the yoke (key 9). Slide the upper sleeve (key 34) onto
the actuator stem (key 10).
13. Put the diaphragm plate and washer (keys 4 and 25) onto the actuator stem (key 10). Insert and tighten the cap
screw (key 3) to fasten the parts together.
14. Place the diaphragm (key 2) pattern‐side up onto the diaphragm plate (key 4). Align the holes in the diaphragm
and the lower diaphragm casing (key 5).
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 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
Sm (20 lbfSft) 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 Sm (10 lbfSft).
17. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to 13 N Sm (10 lbfSft).
18. Repeat this procedure by tightening four hex nuts, diametrically opposed and 90 degrees apart, to a torque of 27
N Sm (20 lbfSft).
19. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to 27 N Sm (20 lbfSft).
20. After the last hex nut is tightened to 27 N Sm (20 lbfSft), all of the hex nuts should be tightened again to 27 NSm
(20 lbf Sft) 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.