The Karl Dungs 267253 DMA 30C120 Modulating Actuator Motor features a 90° rotation stroke with a 30-second travel time.  Designed for precise flow control, the actuator responds to a 4–20 mA input signal, positioning the shaft anywhere between 0° and 90° for accurate modulation.

The actuator is factory calibrated to a 90° stroke but can be field-adjusted to meet specific application requirements.  It is capable of bidirectional movement and can stop at any position within its operating range.
 

Available Travel Times:

• 6 seconds
• 12 seconds
• 30 seconds

In the event of a power loss, the actuator remains in its current position.  Once power is restored, the actuator automatically moves to the position dictated by the controller’s input signal.  If the 4–20 mA control signal is lost while power remains available, the actuator drives fully clockwise (0° position), causing the connected DUNGS DMK butterfly control valve to close.

When paired with a DUNGS DMK butterfly control valve, the DMA actuator automatically regulates the flow of natural gas, propane, butane, and combustion air supplied to gas-fired equipment.

The MTR DMA 30C120 Replaces DMA 30B120
 

Frequently Asked Questions

• What is the Dungs 46050-3 DMA 30C120 Modulating Actuator Motor?

The Dungs 46050-3 DMA 30C120 is a modulating actuator designed to automatically control the position of a DUNGS DMK butterfly valve. It provides precise flow regulation for natural gas, propane, butane, and combustion air applications.

• How does the actuator operate?

The actuator responds to a 4-20 mA control signal and rotates between 0° and 90°. The position of the actuator is proportional to the input signal, allowing precise modulation of valve opening.

• What is the actuator travel time?

This model has a 30-second travel time for a full 90° stroke.

• Can the actuator stop at positions between fully open and fully closed?

Yes. The DMA 30C120 is a true modulating actuator and can stop at any position throughout its 90° operating range based on the incoming control signal.

• What happens if power is lost?

During a power interruption, the actuator remains in its current position. Once power is restored, it moves to the position commanded by the controller's input signal.

• What happens if the 4-20 mA control signal is interrupted?

If power remains available but the control signal is lost, the actuator drives fully clockwise to the 0° position, closing the connected DMK butterfly valve.

• Is the actuator field adjustable?

Yes. Although the actuator is factory-set for a 90° stroke, adjustments can be made in the field to suit specific application requirements.

• Does this actuator include auxiliary switches?

Yes. The DMA 30C120 includes one independently adjustable SPDT auxiliary switch and two built-in limit switches.

• What types of valves is this actuator designed for?

The actuator is specifically designed for use with DUNGS DMK butterfly control valves.

• What media can this actuator control?

When used with a compatible butterfly valve, it can regulate the flow of natural gas, propane, butane, and combustion air.

• Is the Dungs 46050-3 a replacement for another model?

Yes. The DMA 30C120 is the direct replacement for the discontinued DMA 30B120 actuator.

• What control voltage does this model use?

The DMA 30C120 operates on 120 VAC power and accepts a 4-20 mA modulating control signal.