Emerson Process Management 667 - Manual (Page 19)

Instruction Manual
D100311X012
667 Size 80 and 100 Actuators
May 2011
19
8. Tighten the cap screws (key 13) in the following manner. The first four cap screws tightened should be
diametrically opposed and 90 degrees apart. Tighten these four cap screws to 34 N Sm (25 lbfSft).
9. Tighten the remaining cap screws in a clockwise, crisscross pattern to 34 N Sm (25 lbfSft).
10. Repeat this procedure by tightening the four cap screws, diametrically opposed and 90 degrees apart, to a torque
of 68 N Sm (50 lbfSft).
11. Tighten the remaining cap screws in a clockwise, crisscross pattern to 68 N Sm (50 lbfSft).
12. After the last cap screw is tightened to 68 N Sm (50 lbfSft), all of the cap screws should be tightened again to 68
N Sm (50 lbfSft) in a circular pattern around the bolt circle.
13. Once completed, no more tightening is recommended.
CAUTION
Install the diaphragm with the fabric side facing toward the spring. Smooth the edge of the diaphragm to avoid wrinkling
and be careful that the diaphragm fold does not get pinched when the upper diaphragm casing (key 1) is installed.
14. Install the diaphragm backup plate, diaphragm, diaphragm retainer, backup plate, washer (keys 246, 3, 5, 6, 37,
241 and 24), hex nut (key 241), and hex nut (key 24).
15. For actuators with a top‐mounted handwheel (see figure 9), screw the actuator stem extension (key 36) as far as it
will go into the actuator stem connector (key 42) before tightening the hex nut (key 28).
16. For actuators without the handwheel, Install the travel stop cap screw (key 12), and tighten the screw.
17. Position the upper diaphragm casing (key 1) on the diaphragm (key 3) and align the holes.
Note
When you replace actuator diaphragms in the field, take care to ensure the diaphragm casing cap screws 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 80 and 100 actuators.
CAUTION
Do not use lubricant on these cap screws and nuts. Fasteners must be clean and dry.
Overtightening the cap screws (key 13) can damage the diaphragm. Do not exceed 68 N Sm (50 lbfSft) torque.
18. Insert the cap screws (key 13) into the upper diaphragm casing (key 1), and finger tighten the screws.
19. Tighten the cap screws (key 13) in the following manner. The first four cap screws tightened should be
diametrically opposed and 90 degrees apart. Tighten these four cap screws to 34 N Sm (25 lbfSft).
20. Tighten the remaining cap screws in a clockwise, crisscross pattern to 34 N Sm (25 lbfSft).
21. Repeat this procedure by tightening the four cap screws, diametrically opposed and 90 degrees apart, to a torque
of 68 N Sm (50 lbfSft).
22. Tighten the remaining cap screws in a clockwise, crisscross pattern to 68 N Sm (50 lbfSft).
23. After the last cap screw is tightened to 68 N Sm (50 lbfSft), all of the cap screws should be tightened again to 68
N Sm (50 lbfSft) in a circular pattern around the bolt circle.