Flowserve Valtek Spring Cylinder Rotary Actuators - Manual (Page 6)

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,
or serious personal injury may occur.
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
or damage will result.
Mounting Rotary Actuators with non-
clamping lever Valtek Valve Bodies
When mounting a rotary actuator to a Valtek valve body,
refer to Installation, Operation, Maintenance Instruc-
tions 10 in the case of Valdisk, 27 for ShearStream, or
39 for MaxFlo valves. When mounting a rotary actuator
on other manufacturers’ valve bodies, refer to the ap-
propriate 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 or damage will result.
1. Cycle the valve (or mechanical device) to just
beyond the closed position with very low supply
air pressure (10-15 psi).
2. Turn the stroke stop in clockwise (as viewed from
the end) until resistance is felt. Turn the stroke stop
an additional 1/8 turn. Check to see that the valve
is closed on dead center. If not, adjust the stop until
the valve is closed on dead center.
3. Cycle the valve open. Adjust the other stroke stop
until valve is 90 degrees from the closed position.
4. Cycle the valve several times to make certain the
position indicator returns to the same position with
each cycle.
5. Tighten the stroke stop jam nuts.
REVERSING THE ACTUATOR ACTION
The rotary actuator transfer case allows for four different
mounting positions and for either fail-close or fail-open
air failure operation, without retubing or changing the
fail-safe spring in the actuator. Before reversing the ac-
tuator action, make sure there is no line pressure in the
valve and support the actuator assembly by the lifting
ring. Refer to Figures 1 and 2 and proceed as follows:
NOTE: Not all positions are available on all actuator
sizes; contact factory if a problem occurs while reversing
the actuator action.
1. Disconnect the air and relieve spring compression.
2. Remove the transfer case cover plate bolts. Carefully
slide cover plate off the end of the splined lever.
3. On older designs with clamping lever arms, loosen
the linkage bolt.
4. Remove bolts connecting transfer case to the yoke.
5. On older designs with clamping lever arms, slide
the actuator assembly off the shaft. If necessary,
wedge the splined lever arm apart to loosen it on
the shaft spline.
6. Index the valve by manually rotating it 90 degrees.
If the valve is closed, rotate it to the open position
or vice versa.
7. Reverse the transfer case on the yoke by turning it
180 degrees. The yoke side now becomes the cover
plate side and the cover plate side becomes the
yoke side. Since this changes the direction of the
actuator’s rotation, it may be necessary to change
the mounting position of the valve in line to achieve
the proper orientation.
NOTE: Before reconnecting the actuator to the
valve, verify that the valve rotation matches the
actuator rotation and complies with the air failure
requirement.
8. Reconnect the actuator to the valve or mechanical
device. On actuators with clamping lever arm,
center the splined lever arm and tighten the linkage
bolt according to the data in Table II.
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