Instruction Manual
D103409X012
Installation
May 2013
22
Sliding‐Stem Linear Actuators over 210 mm (8.25 Inches) Travel
Refer to the following guidelines when mounting on sliding‐stem linear actuators over 210 mm (8.25 inches) travel
(see figure 2‐13).
1. Isolate the control valve from the process line pressure and release pressure from both sides of the valve body. Shut
off all pressure lines to the pneumatic actuator, releasing all pressure from the actuator. Use lock‐out procedures to
be sure that the above measures stay in effect while working on the equipment.
2. Install the cam to the valve stem connector as described in the instructions included with the mounting kit.
3. Install the mounting adaptor to the actuator.
4. Attach the feedback unit and mounting kit assembly to the mounting adaptor. The roller on the feedback arm will
contact the actuator cam as it is being attached.
GX Actuators
The DVC6215 feedback unit mounts directly on the GX actuator without the need for a mounting bracket.
Identify the yoke side to mount the DVC6215 feedback unit based on the actuator fail mode. Refer to the GX Control
Valve and Actuator System instruction manual (D103175X012).
1. Isolate the control valve from the process line pressure and release pressure from both sides of the valve body. Shut
off all pressure lines to the actuator, releasing all pressure from the actuator. Use lock‐out procedures to be sure
that the above measures stay in effect while you work on the equipment.
2. Loosely attach the feedback pieces and magnet assembly to the valve stem connector. Do not tighten the fasteners
because fine adjustment is required.
CAUTION
Do not install a magnet assembly that is shorter than the physical travel of the actuator. Loss of control will result from the
magnet assembly moving outside the range of the index mark in the feedback slot of the DVC6215 housing.
3. Using the alignment template (supplied with the mounting kit), position the feedback assembly inside the retaining
slot.
4. Align the magnet assembly as follows:
For air‐to‐open GX actuators vertically align the magnet assembly so that the center line of the alignment template is
lined up as close as possible with the upper
extreme of the valid travel range on the magnet assembly. The magnet
assembly should be positioned so that the index mark in the feedback slot of the DVC6215 housing is within the valid
range on the magnet assembly throughout the range of travel. See figure 2‐15.
For air‐to‐close GX actuators vertically align the magnet assembly so that the center line of the alignment template is
lined up as close as possible with the lower
extreme of the valid travel range on the magnet assembly. The magnet
assembly should be positioned so that the index mark in the feedback slot of the DVC6215 housing is within the valid
range on the magnet assembly throughout the range of travel. See figure 2‐16.
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