Emerson Fisher Type 667 size 80 User Manual

Type 667 Sizes 80 & 100
14
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 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.
18. Insert the cap screws (key 13) into the upper dia-
phragm 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 25 lbfSft (34 NSm).
20. Tighten the remaining cap screws in a clockwise,
criss-cross pattern to 25 lbfSft (34 NSm).
21. Repeat this procedure by tightening four cap
screws, diametrically opposed and 90 degrees apart,
to a torque of 50 lbfSft (68 NSm).
22. Tighten the remaining cap screws in a clockwise,
criss-cross pattern to 50 lbfSft (68 NSm).
23. 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.
24. Once completed, no more tightening is recom-
mended.
25. For actuators with top-mounted handwheel
(see figure 9), mount gear case assembly (key 41) on
the actuator using cap screws (key 54). Install hex
nuts (key 47) and travel stop cap screw (if used) on
actuator stem extension (key 36). Install gear case
cover (key 53) with cap screws.
26. Mount the actuator on the valve, and secure with
the actuator-to-bonnet bolting. Refer to the Installation
section to connect actuator stem to valve plug stem.
Size 80 Side-Mounted Handwheel
The side-mounted handwheel assembly (figure 8) is
normally used as a manual operator. The handwheel
can be mounted in either of two position orientations
so that, regardless of valve plug action, counterclock-
wise rotation always opens the valve. The assembly is
a continuously connected type with an indicator to
show neutral position. By rotating the handwheel away
from neutral, the handwheel can be used to limit travel
in either direction, but not both directions at the same
time.
A grease fitting is provided on the gear box for periodic
gear lubrication with a general-purpose grease.
Instructions are given below for complete disassembly
and assembly. Perform the disassembly only as far as
necessary to accomplish the required maintenance;
then, begin the assembly at the appropriate step.
Key numbers refer to figure 8.
Disassembly
1. Complete steps 1 through 16 of the Disassembly
portion of the Size 80 Actuator Maintenance section.
2. Unscrew cap screws (key 88), and remove spring
case (key 85). Unscrew cap screws (key 136), and
remove retaining flange (key 134). Do not lose the key
(key 122).
3. Unscrew two screws (key 79), and remove travel
stop indicator (key 126).
4. Turn handwheel (key 58) to raise lower sleeve.
Continue turning handwheel until lower sleeve is free
of worm gear (key 44). Lift out lower sleeve, bearing
and gear retainer, thrust bearing, and worm gear (keys
123, 45, 43, and 44).
5. The worm shaft (key 51) and associated parts can
be removed in order to replace or lubricate them. First,
remove the handwheel cap (key 127) and the hand-
wheel (key 58). Do not lose the small ball or spring
(keys 141 and 142).
6. Loosen the two set screws and unscrew the two
worm retainers (keys 48 and 49). The ball bearings
(key 50) will come out with the retainers. Remove the
worm shaft (key 51).
Assembly
1. Pack the ball bearings (key 50) with Lubriplate
MAG-1 lubricant (key 237) or equivalent, and insert
one ball bearing in the back worm retainer (key 48).
2. Thread the back worm retainer and ball bearing
(keys 48 and 50) into the gear case. Align the set

Emerson Fisher Type 667 size 80 Specifications

General

Brand	Emerson
Model	Fisher Type 667 size 80
Category	Controller
Language	English