VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin
4
Manual Override Operation
The manual override operates similarly to the adjusting knob on a mechanical
wristwatch. To engage the manual override, pull the handwheel to its outermost
position. When the manual override engages, the actuator stops electrical
operation.
A yellow position indicator shows that the manual override is engaged. Dry
contacts on an internal switch can provide remote electrical indication of the
override status.
Spring plungers hold the two handwheel positions (engaged and disengaged) in
place. The handwheel remains in position until physically moved. Rotating the
handwheel in a clockwise direction rotates the output shaft in the same clockwise
(closed) direction. Rotating the handwheel in a counterclockwise direction rotates
the output shaft in the same counterclockwise (open) direction.
Pre-installation Storage
A temporary conduit entry plug, installed in shipped actuators, prevents foreign
matter from entering the actuator. Store the actuator properly in a dry,
temperature-controlled area to prevent moisture from entering through this
temporary plug. Replace the temporary conduit plug with a permanent conduit
plug if the actuator is stored for a long period of time or stored in adverse
conditions. Prevent condensation from forming by maintaining a near constant
external temperature and supplying power to the heater internal to the actuator.
Installation
Mounting
VA-9070 Series electric actuators are suitable for direct mounting on
Johnson Controls VF Series Butterfly Valves. VA-9070 Series Electric Actuators
cannot be used on the VF4000 and VF5000 Series Butterfly Valves. Installing the
VA-9070 Series actuator onto other quarter-turn valves or devices requires proper
mounting hardware.
When mounting the actuator in the standard position, orient the actuator with its
handwheel in a vertical plane and parallel to the pipeline. When mounting the
actuator on a vertical pipe, position the actuator with the conduit entries on the
bottom to prevent condensation from entering the actuator by way of the conduit.
In all cases, position the conduit to prevent drainage into the actuator.
Mount the actuator to the valve using the following procedure:
1. Manually operate the actuator until the output shaft of the actuator lines up
with the valve stem. If possible, use an intermediate position, such as valve
disc/stem and actuator half-open.
2. Place the proper sleeve adaptor (if required) onto the valve stem. Apply a small
amount of grease to the sleeve adaptor to ease assembly.