Instruction Manual

Instruction Manual

D103176X012

Installation

April 2014

Sliding-Stem (Linear) Actuators

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. Attach the mounting bracket to the actuator.

3. 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 array that is shorter than the physical travel of the actuator. Loss of control will result from the

magnet array moving outside the range of the index mark in the feedback slot of the DVC2000 housing.

4. Using the alignment template (supplied with the mounting kit), position the feedback array inside the retaining

slot.

5. Align the magnet array as follows:

D For air-to-open actuators (e.g. Fisher 667) vertically align the magnet array 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

feedback array. See figure 2‐4.

D For air-to-close actuators (e.g. Fisher 657) vertically align the magnet array 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

feedback array. See figure 2‐5.

6. Tighten the fasteners and remove the alignment template.

Note

Use a flat end hex key to tighten the mounting assembly fasteners to a torque of 2.37 N•m (21 in•lbf) for 4 mm screws, and

5.08 N•m (45 in•lbf) for 5 mm screws. While tightening the fasteners using the hex key should be sufficient, blue (medium) thread

locker may be used for additional security.