Spring Return P Series Actuators - Fisher D500243X012 Instruction Manual

Instruction Manual
Form 5417
February 2007
8 SPRINGS
12 SPRINGS
ELO A 4.201
A7041-1 / IL
Figure 9. Spring Arrangement for P Series Actuators
4. Place the end cap bolts through the retention
holes of the end cap. If converting a double acting
unit to a spring return unit, be sure to use new end
cap screws (key 25, figure 12).
5. Engage the bolts with the tapped holes in the
actuator body by forcing down slightly on the cap.
Tighten each bolt in small, equal amount of turns,
compressing the springs equally.

Spring Return P Series Actuators

Spring return actuators use from four to a maximum
of fourteen springs. One through seven springs are
inserted into each end cap (see figure 9). Refer to
the nameplate to verify the number of springs
required.
1. When installing used springs in a spring return
actuator, ensure that the springs are replaced in
their identical position in the end cap from where
they were removed.
When less than the standard number
of seven springs are used in each end
cap, the springs should be positioned
as shown in figure 9.
2. If a spring return actuator is being repaired due to
a failed spring, replace all the springs in the actuator.
10 SPRINGS
14 SPRINGS
Note
1035/El-O-Matic Actuator
1F1137 - ANGLE NEEDLE VALVE
1C4882 - PIPE NIPPLE
E0059 / IL
Figure 10. Bypass Valve
3. Ensure that the pistons are stroked fully inward,
towards the center of the actuator (this may be done
by rotating the actuator shaft with a wrench).
4. When replacing the springs in a P Series
spring-return actuator, position the actuator so that it
stands on one end.
5. Place the springs on the piston face, engaging
them with the alignment nibs cast into the piston.
6. Place the end cap over the springs. Align them
with the corresponding nibs which are cast into the
end cap.
7. If converting a double acting unit to a spring
return unit, be sure to use new end cap screws
(key 25, figure 12). Install the end cap screws.
8. Engage the screws with the tapped holes in the
actuator body by forcing down slightly on the cap.
Tighten each bolt in small, equal amount of turns,
compressing the springs equally.
4 X 1/4-NPT
11A8741
5/8X3/4X1/16
17