OpTK Spring Cylinder Rotary Actuators
4
7. Install cover plate and yoke onto transfer
case. The four tapered lug bolts are used
with the yoke and standard hex bolts are
used with the cover plate.
8. Install base slider O-ring into sliding seal
groove machined in the transfer case.
9. Install actuator stem O-ring into the sliding
seal collar. Then slide the collar over the
actuator stem.
10. Place retaining washer over the collar and
install the spiral retaining ring into the
transfer case.
11. Replace the piston O-ring and piston backup
ring onto piston, making certain the piston
backup ring is on top (toward the top of
cylinder) of the piston O-ring.
Note:
200 square-inch actuators use two
piston backup rings. They are placed on
each side of the piston O-ring.
12. Install the piston stem O-ring and piston on to
the actuator stem.
13. Install the spring guide (50, 100, and 200
square-inch actuators only) and actuator
stem locknut onto the actuator stem. Tighten
the actuator stem locknut firmly.
14. Install the cylinder O-ring into transfer case
groove.
Note:
Replace cylinder O-ring if damaged.
15. Install the spring and spring button.
16. Slide cylinder down over piston and transfer
case.
CAUTION:
The cylinder must be
perpendicular with the piston
when sliding it over the piston O-
ring. If this is not done, the O-ring
could be damaged.
17. Reinsert the cylinder retaining ring in the
cylinder by feeding it a little at a time into the
groove. Make sure it is securely fastened.
WARNING:
Ensure that the
cylinder retaining ring is completely
seated in the cylinder groove.
18. Center the hole in the spring button directly
under the adjusting screw hole. Install the
adjusting screw and tighten only enough to
provide an air seal with the gasket.
Do not
overtighten.
19. If actuator is to be used with a positioner,
mount positioner and connect tubing.
CAUTION:
The actuator cover
plate and yoke must be installed
prior to stroking the actuator.
Mounting Rotary Actuators with non-
clamping lever Optimux Valve Bodies
When mounting a rotary actuator to an Optimux
valve body, refer to product instruction manuals
for the OpDx, OpVee, OpExc valves. When
mounting a rotary actuator on other
manufacturers’ valve bodies, refer to the
appropriate literature.
When mounting an actuator with clamping lever
arm, firmly tighten the clamping bolt on the
splined lever arm.
Adjusting External Stroke Stops
After disassembly and reassembly it may be
necessary to readjust the external stroke stops to
avoid valve leakage. The external stroke stops
should be adjusted while the valve is out of line.
To adjust the external stroke stops, proceed as
follows:
CAUTION:
Actuators with
clamping lever arms must be
attached to a valve or other
mechanical device and the
transfer cover plate must be
installed prior to stroking the
actuator.
