Emerson Fisher Type 667 size 80 Instruction Manuals page 11

WARNING
To avoid personal injury and property
damage from the sudden release of
spring load, be sure that all spring load
is removed from the actuator lower dia-
phragm casing.
6. Unscrew the four hex nuts that secure the lower
diaphragm casing to the yoke assembly (key 67), and
remove lower diaphragm casing. Replace yoke as-
sembly O-rings (key 70) as necessary.
7. The actuator spring (key 18) and stem (key 144)
can now be removed if necessary. Be sure to discon-
nect stem connector (key 31) before removing stem.
8. Refer to the following Assembly procedures. Care-
fully clean and inspect all parts, or obtain replacement
parts required for re-assembly.
Assembly
1. If the actuator stem (key 144, figure 7) was re-
moved, lubricate the threads on the stem with Lubri-
plate MAG-1 lubricant (key 237) or equivalent.
2. On the actuator stem, assemble hex nuts, thrust
bearing, and spring seat (keys 26, 25, 86, and 19) to
the stem. Be certain that the thrust bearing race with
the larger inside diameter faces the spring seat. Ro-
tate adjusting nut (key 25) to position spring seat 12
inches (305 mm) from the end of the stem.
3. Install actuator stem assembly into yoke assembly
(key 67). Place a support under the stem to position
the lower end of the stem 10 inches (254 mm) above
the bottom surface of the actuator (actuator-to-bonnet
joint).
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 (key 25).
4. Install lower diaphragm casing, 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, and seal bushing retainer (keys 8, 9, 7 and
10) and secure with cap screws (key 11).
Note
Type 667 Sizes 80 & 100
6. Install diaphragm backup plate, diaphragm retainer,
diaphragm, upper diaphragm plate, and washer (keys
6, 5, 3, 4, and 37) on the actuator stem (key 144).
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
upper diaphragm casing (key 1) 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.
7. For actuators with a top-mounted handwheel,
screw actuator stem extension (key 36, figure 9) as far
as it will go into actuator stem connector (key 42, fig-
ure 9) before tightening hex nut (key 28, figure 9).
8. For actuators without top-mounted handwheel,
Install the hex nut (key 241) and tighten, install the jam
nut (key 24) and tighten that locks hex nut key 24 in
place. Install the travel stop (key 12).
9. Position the upper diaphragm casing (key 1) on the
diaphragm (key 3) and align the holes.
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.
Do not use lubricant on these bolts and
nuts. Fasteners must be clean and dry.
CAUTION
Overtightening the diaphragm casing
cap screws and nuts can damage the
diaphragm. Do not exceed 50 lbf ft (68
N m) torque.
Note
Note
Note
11