Installation Instructions

Instruction Manual

D100311X012

667 Size 80 and 100 Actuators

May 2011

10. 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 do 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 diaphragm casing cap screws and nuts can damage the diaphragm. Do not exceed the following

maximum torque values for the appropriate diaphragm material: EPDM/Meta-Aramid: 95 NSm (70 lbfSft); Nitrile, Silicone,

FKM (fluorocarbon) / Meta-Aramid: 68 NSm (50 lbfSft).

11. Insert the cap screws (key 13) 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 3 for the diaphragm material being used.

12. Tighten the remaining hex nuts in a clockwise, crisscross pattern to the initial torque value found in table 3 for the

diaphragm material being used.

13. Repeat this procedure by tightening four hex nuts, diametrically opposed and 90 degrees apart, to the final torque

value that is specified in table 3 for the diaphragm material being used.

14. Tighten the remaining hex nuts in a clockwise, crisscross pattern to the final torque value that is specified in table

3 for the diaphragm material being used.

15. After the last hex nut is tightened, complete another tightening sequence. Tighten in a circular pattern around the

bolt circle to the final torque value that is specified in table 3 for the diaphragm material being used.

16. Once completed, no more tightening is recommended.

17. For size 80 actuators without a manual operator, slide the following parts over the bottom of the stem; yoke

bushing holder (key 250), two split yoke bushings (key 249), and yoke bushing retainer (key 251). Secure into place

with 4 cap screws (key 252). Before inserting the bushing halves, lightly coat with lithium grease (key 237)

lubricant.

18. Mount the actuator on the valve in accordance with the procedures in the Installation section.

Size 100 Actuator Maintenance

For size 100 actuators, refer to figure 5 for part names and locations. Key number locations for Size 100 actuators are

shown in figure 7.

Table 3. Size 80 Casing Cap Screw Torque Values

DIAPHRAGM MATERIAL

INITIAL TORQUE FINAL TORQUE

NSm (lbfSft) NSm (lbfSft)

EPDM / Meta-Aramid 41 (30)

82$13 (60$10)

Nitrile, Silicone, FKM/Meta-Aramid 34 (25) 68 (50)

WARNING

Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing

any maintenance operations: