An electrically controlled device regulating fluid flow through an orifice is characterized by having two ports and two positions. This allows the valve to either permit or block the passage of liquid or gas. As an illustration, consider a component used in a coffee machine to regulate the water entering the brewing chamber; when energized, it opens, allowing water to flow, and when de-energized, it closes, stopping the water supply.
This type of valve offers significant advantages in automation systems due to its reliability, speed of operation, and ability to be controlled remotely. Its development has been integral to advancements in various industries, from manufacturing and process control to medical equipment and automotive engineering, enabling more precise and efficient fluid management. The widespread adoption is due to its relatively simple design and ease of integration into complex systems.