Reversing The Actuator Action - Flowserve Valtek VR User Instructions

indicator returns to the same position with each cycle.

Tighten the stroke stop jam nuts.
Figure 3: Actuator Mounting on Valve

13.4 Reversing the Actuator Action

The Vaktek VR transfer case allows for four different mounting
positions and for either fail-close or fail- open air failure operation,
without changing the fail-safe spring in the actuator. Before
reversing the actuator action, make sure there is no line pressure
in the valve and support the actuator assembly by the lifting ring.
Refer to Figure 2 and proceed as follows:
Not all positions are available on all actuator
sizes; contact factory if a problem occurs while
reversing the actuator action.
 Disconnect the air and relieve spring compression by
loosening adjusting screw.
 Remove the transfer case cover plate bolts. Carefully slide
cover plate off the end of the splined lever.
 Loosen the linkage bolt on splined lever arm.
 Remove bolts connecting transfer case to the yoke.
 Slide the actuator assembly off the shaft. If necessary,
wedge the splined lever arm apart to loosen it on the shaft
spline.
 Index the valve by manually rotating it 90 degrees. If the
valve is closed, rotate it to the open position or vice versa.
 Flip the transfer case on the yoke by turning it 180 degrees.
VLAIM031-14 (EN/AQ) May 2023
Valtek VR Spring Cylinder Rotary Actuators
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.
Before reconnecting the actuator to the valve,
verify that the valve rotation matches the
actuator rotation and complies with the air failure position
requirement.
 Reconnect the actuator to the valve else mechanical device.
On actuators, center the splined lever arm and tighten the
linkage bolt.
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