What is a double solenoid?

Automation and Control Industrial Automation and Control
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A double solenoid is one with two coils. Most examples of double solenoids I could find were used in solenoid valves, such as the DFRobot FIT0617 (Digi-Key 1738-FIT0617-ND) shown on the following link: https://www.digikey.com/product-detail/en/dfrobot/FIT0617/1738-FIT0617-ND/10230100

Coil A, when energized, moves the valve to position A, and coil B, when energized, moves the valve to position B. When neither coil is energized, the valve remains in its current state. This would be similar in function to a dual coil latching relay. One of the advantages is that the output controlling this valve would not have to continually stay active. A disadvantage would be that a separate output would be required to return the valve to the other position.

In contrast, a single (normal) solenoid, when de-energized, will return to its starting state, like a non-latching relay. Some advantages of this would be that only one output would be needed to control the valve, and that, whenever the program starts, it would be in a predictable state. A disadvantage would be that, to keep it in its energized state, the output controlling it would have to remain activated for the entire duration the valve is to remain in the energized state.

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Double solenoids, like the DFRobot FIT0617, have two coils for tasks like solenoid valves. Coil A shifts the valve to position A, Coil B to position B, and no coil keeps the valve as is. This is similar to dual coil latching relays, needing less constant control but an extra output for position change.

On the other hand, single solenoids revert when power’s off, like non-latching relays. One output manages the valve, assuring a predictable start state. Yet, it requires continuous power to stay energized, unlike double solenoids.

Hope this helps!

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