If the power is removed from a solenoid valve and it opens, what type of valve is it?

A solenoid valve that opens when power is removed is classified as a normally open valve. This design means that in its default state—when no electrical power is applied—the valve allows fluid to flow freely. When power is supplied to the solenoid, the valve closes and interrupts the flow.

This mechanism is commonly used in various applications where an open state is preferred in the absence of power. For instance, in safety systems, if there is a loss of electricity, the valve will open, allowing for a safe release of pressure or fluid.

Understanding this classification is crucial for selecting the right type of valve for specific uses, especially in systems that require fail-safe operations or unique response characteristics under varying power conditions.