Valworx Electric Actuators

Multi-voltage electric actuators use auto-sense circuity to determine the supply voltage and condition it appropriately for internal use. Most multi-voltage actuators are capable of operating on a supply voltage range from 24- 240V AC or DC. Upon receipt of a continuous signal the motor runs until the valve is rotated 90 degrees. When the valve reaches the open or closed position an internal cam on the actuator strikes a limit switch and shuts off the motor. If the electric signal is lost mid-stroke the valve stays in mid-stroke position.
Sometimes upon loss of power it is necessary to have the valve fail to a certain position- ie “fail open” or “fail closed.” Electric actuators accomplish this by a battery backup, or battery safe return (BSR). Upon loss of power the battery backup kicks in and returns the valve to the desired position (i.e open or closed).
Multi-voltage actuators can also be throttled with the installation of additional circuity. This consists of an encoder as well as control and feedback logic. Changing the input signal (usually 4-20mA or 0- 10V) results in a corresponding and proportional change in the position of the valve.
Both of these features- battery safe return (BSR) and digital positioner (DPS)- are available as factory-installed options on Valworx multi-voltage actuators.
Some features that differentiate higher quality multi-voltage actuators include a brushless motor, a thermostatic heater to prevent internal condensation, a manual override mechanism, a weatherproof enclosure (normally IP 67/NEMA 4X or higher) and a dome positioner.
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