Mounting The Actuator On The Valve - Fisher 667 Instruction Manual

Type 667 Size 30-76 & 87
you perform the Bench Set Spring Adjustment proce-
dures in this section to confirm that the actuator is ad-
justed correctly for the valve travel.
D Positioner: If a positioner is installed, or is to be
installed on the actuator, refer to the positioner instruc-
tion manual for installation. During the adjustment pro-
cedures, it will be necessary to provide a temporary
loading pressure to the actuator diaphragm.
D Handwheel Cap: If the handwheel cap (key 247,
figures 9, 11, or 16) is not in place, install the cap by
pushing it on by hand until it snaps into place.

Mounting the Actuator on the Valve

CAUTION
The Type 667 actuator spring load
pushes the stem down out of the actua-
tor yoke (see figure 2), and it can come
in contact with the valve stem during ac-
tuator mounting.
If the valve stem is allowed to remain in
the up position (towards the actuator)
during actuator mounting, it can inter-
fere with the actuator stem during
mounting. It is possible to damage valve
stem threads or bend the valve stem. Be
sure the valve stem is pushed down
(into the valve body), away from the ac-
tuator while mounting.
It may be necessary to apply a temporary loading
pressure to the actuator to move the actuator stem
away from the valve during installation.
If it is not possible to provide a temporary loading pres-
sure, be very careful when lowering the actuator over
the valve stem to prevent damage to valve stem and
threads.
WARNING
When moving the actuator stem with
loading pressure applied, exercise cau-
tion to keep hands and tools out of the
actuator stem travel path. If the loading
pressure is accidently disconnected,
personal injury and property damage is
possible if something is caught between
the actuator stem and other control
valve parts.
1. Provide a vise or some other method of supporting
the valve and the weight of the actuator during assem-
4
VENT NPT FEMALE
CONNECTION (TOP LOADING)
DIAPHRAGM CASINGS
DIAPHRAGM AND
STEM SHOWN IN
DOWN POSITION
DIAPHRAGM
PLATE
NPT FEMALE
CONNECTION
ACTUATOR SPRING
ACTUATOR STEM
SPRING SEAT
SPRING ADJUSTOR
STEM CONNECTOR
YOKE
TRAVEL INDICATOR DISK
INDICATOR SCALE
W0364–1/IL
VALVE STEM
YOKE LOCK NUT
YOKE BOSS
DIAMETER
BONNET
TYPICAL VALVE
(REFER TO
VALVE MANUAL)
W6199–1/IL
Figure 3. Actuator-Mounting Components for
Size 30 through 70 Actuators
bly. For direct or reverse acting valves, push the valve
stem down away from the actuator while mounting the
actuator.
2. Screw the stem locknuts all the way onto the valve
stem. With the concave side of the travel indicator disk
(key 34) facing the valve, install the travel indicator
disk on the valve stem. (Note: The travel indicator disk
is not used with size 87 actuators.)
3. Lift or hoist the actuator onto the valve bonnet:
a. For size 87 actuators: Slowly lower the actua-
tor down onto the valve while guiding the valve
stem into the opening in the end of the the actuator
stem (see figure 4). Once the actuator is in place,
insert the cap screws and tighten the hex nuts, se-
curing the actuator to the bonnet.
MATCH LINE
FOR
ACTUATOR