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Instruction Manual
D100310X012
(key 237). Tighten the cap screw (key 12) to the appropriate torque as shown in table 2. Place this assembly in the
actuator. Take care when pushing the actuator stem through the seal bushing so that the threads do not damage
the O‐rings.
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 30/30i‐76/76i and 87 actuators.
CAUTION
Over‐tightening the diaphragm cap screws and nuts (keys 13 and 14) can damage the diaphragm. Do not exceed 27 NSm
(20 lbfSft) torque.
Note
Do not use lubricant on these bolts and nuts. Fasteners must be clean and dry.
5. Install the upper diaphragm casing (key 1), and install the cap screws and nuts (keys 13 and 14). Tighten the
diaphragm cap screws and nuts in the following manner.
6. The first four bolts tightened should be diametrically opposed and 90 degrees apart. Tighten these four bolts to 13
NSm (10 lbfSft).
7. Tighten the remaining bolts in a clockwise, criss‐cross pattern to 13 NSm (10 lbfSft).
8. Repeat this procedure by tightening four bolts, diametrically opposed and 90 degrees apart, to a torque of 27 NSm
(20 lbfSft).
9. Tighten the remaining bolts in a clockwise, criss‐cross pattern to 27 NSm (20 lbfSft).
10. After the last bolt is tightened to 27 NSm (20 lbfSft), all of the bolts should be tightened again to 27 NSm (20 lbfSft)
in a circular pattern around the bolt circle.
11. Once completed, no more tightening is recommended.
12. Install the actuator spring (key 18) and spring seat (key 19). Apply anti‐seize lubricant (key 239) to the threads of
the actuator stem and to the surface of the spring adjuster (key 74) that contacts the spring seat. Thread the spring
adjuster onto the actuator stem.
13. Mount the actuator onto the valve in accordance with the procedures in the Installation section.
Top‐Mounted Handwheel Assembly (Adjustable Down Travel Stop)
Actuator key numbers are shown in figures 6, 7, 8, 9, and 10. And, top‐mounted handwheels are shown in figures 11,
12, 13, 14, and 15.
Note
If repeated or daily manual operation is expected, the actuator should be equipped with a side‐mounted handwheel rather than a
casing‐mounted travel stop or top‐mounted handwheel. The side‐mounted handwheel is designed for more frequent use as a
manual operator.
667 Actuator (Size 30/30i - 76/76i and 87)
May 2018
15
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