User Guide

Installation: Mx51-710x Series Actuator to 1/2" to 2" VB-7xxx Series Valve

Bodies, 2-Way Stem-Up Closed and 3-Way Mixing or Diverting Applications

A. Preload the valve to insure proper close-off according to the numbered steps in

Figure-10 and the text below. (Remove power before proceeding.)

1. Locate the steel jam nut that came packaged with the actuator. (Do not re-use the brass

jam nut present on an existing valve.)

2. Screw the nut onto the valve stem all the way as far as it will go (you may need to use

a TOOL-20-1 or a 5/16” open-end wrench). At least 1/2” of the valve stem should

extend above the nut.

3. Thread the stem extension onto the valve stem, making contact with the jam nut.

Raise the valve stem to the full up position.

Actuator extends

with increased signal.

Direct Acting

(pins connected)

Actuator retracts

with increased signal.

Reverse Acting

(pins open)

Figure-9 RA/DA Jumper Setting for Proportional Models

*Not included with actuator.

Valve Body*

Hex Mounting Nut*

Stem Extension

Mounting Bracket

Rack

Actuator

Manual Override

Connecting Pin

Jam Nut

Valve Stem*

Crank

Figure-10 Mx51-710x Series Actuator Exploded View