Microelectric actuators – two position

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Actuators
RS-232 cables

What microelectric actuator model goes with my two position valve?
Notice of design change

The microelectric valve actuator provides Valco dependability in a unit which is less than half the size of our standard model. The actuator consists of a control module, a stepper motor/gearbox assembly, a manual remote control, interconnecting cables, and a 110/230 VAC to 24 VDC power supply. The RS-232 interface cable, if required, must be ordered separately.

The two position microelectric actuator features exclusive stall-sensing circuitry which eliminates problems associated with valve/actuator misalignment. Power to the actuator motor is switched off when the driver pin goes against the stop of the valve cutout - no sooner, no later - and it’s all done without any mechanical microswitches. Not only does this mean that alignment problems are a thing of the past, it means that you can stock one actuator for valves that turn 30°, 36°, 45°, 60°, 90°, or anything in between.

During initialization, the valve rotates at moderate speed while the actuator waits to sense the stall. Once the rotation angle has been measured and confirmed by repetition, the angle is memorized and actuation takes place at maximum speed. Valve position memory is maintained even in the event of a power failure. There is nothing more to do unless you wish to install a valve with a different angle of rotation. In that event, cycling the actuator with no valve mounted sets up reinitialization.

An actuator can be specified with closemount hardware, with a 2”, 3”, 4”, or 6” standoff, or with just the standoff mounting hardware, if your valve already has a standoff. Valves which will be mounted in ovens require a standoff assembly, which locates the actuator out of the heated zone.

Tech tip

Controlling multiple microelectric actuators

Download an instruction manual

View a manual in pdf format. (To download a manual, right click this link and save the file to your computer. Go here for more about viewing the manuals.)

Further reference

Declaration of CE Compliance
Mounting hardware
   What mounting hardware do I need?
   Closemount hardware
   Standoff assembly
   Right angle drive
What microelectric actuator model goes with my two position valve?
Other two position actuators
   Standard electric
   Air

Since different valve models have varying actuation torque requirements, there are three microelectric actuator models for two position valves.Consult a chart to determine which model your valve requires.

Two position microelectric actuators

Tech tip: RS-232 cables

An RS-232 interface cable (I-22697) is required for controlling an actuator from a computer serial port. Multi-drop cables permit a single serial port to control multiple microelectric two position and multiposition actuators. Multi-drop cables have one female DB9 and 2 to 8 male DB9 connectors – approximately 6” long. Note: the RS-232 interface cable (I-22697) is required for each actuator controlled serially.