Type 667 Sizes 80 & 100
13
Note
When installing lower diaphragm cas-
ing, install O-rings (key 70) into grooves
found in the lower diaphragm casing
before placing the casing on the yoke
assembly. If the spring interferes with
installation of lower diaphragm casing,
reposition spring by rotating adjusting
nut.
4. Install the lower diaphragm casing (key 67), and
secure it by tightening the four hex nuts.
5. Lubricate seal bushing O-rings (keys 8 and 9) and
the seal bushing (key 7) with Lubriplate MAG-1 or
equivalent lubricant. Install seal bushing O-rings, seal
bushing (keys 8 and 9), and seal bushing retainer (key
7) and secure with four hex nuts.
Note
Install diaphragm with the fabric side
facing away from the spring. Smooth
the edge of the diaphragm to avoid
wrinkling and be careful that the dia-
phragm fold does not get pinched
when the diaphragm adaptor (key 245,
figure 5) is installed.
CAUTION
If the diaphragm (key 3) is installed so
air pressure is applied to the fabric side,
it will immediately de-laminate the seal-
ing surface (smooth surface) from the
fabric. The de-lamination can cause im-
mediate failure of the diaphragm’s abili-
ty to retain pressure.
6. Install diaphragm backup plate, diaphragm retainer,
diaphragm, O-ring, and diaphragm plate (keys 6, 5, 3,
240, and 4) on the actuator stem (key 144).
7. Carefully fold the diaphragm between the dia-
phragm back-up plate (key 246) and the case adapter
(key 245) while lowering the adapter onto the lower
diaphragm casing assembly (key 67). Install all 40 cap
screws (key 13) and finger tighten.
Note
When you replace actuator diaphragms
in the field, take care to ensure the dia-
phragm casing bolts are tightened to
the proper load to prevent leakage, but
not crush the material. Perform the fol-
lowing tightening sequence with a
manual torque wrench for size 80 and
100 actuators.
Note
Do not use lubricant on these bolts and
nuts. Fasteners must be clean and dry.
CAUTION
Overtightening the cap screws (key 13)
can damage the diaphragm. Do not ex-
ceed 50 lbfSft (68 NSm) torque.
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 25 lbfSft (34 NSm).
9. Tighten the remaining cap screws in a clockwise,
criss-cross pattern to 25 lbfSft (34 NSm).
10. Repeat this procedure by tightening four cap
screws, diametrically opposed and 90 degrees apart,
to a torque of 50 lbfSft (68 NSm).
11. Tighten the remaining cap screws in a clockwise,
criss-cross pattern to 50 lbfSft (68 NSm).
12. After the last cap screw is tightened to 50 lbfSft
(68 NSm), all of the cap screws should be tightened
again to 50 lbfSft (68 NSm) in a circular pattern around
the bolt circle.
13. Once completed, no more tightening is recom-
mended.
Note
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 dia-
phragm fold does not get pinched when
upper diaphragm casing (key 1) is
installed.
14. Install the diaphragm back-up plate, diaphragm,
diaphragm retainer, back-up 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 actuator stem extension (key
36) as far as it will go into actuator stem connector
(key 42) before tightening hex nut (key 28).
16. For actuators without the handwheel, Install
the travel stop cap screw (key 12), and tighten the
screw.
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