Discrete control valves are binary; they have how many states?

• A. One
• B. Two
• C. Three
• D. Four

Answer: (B)

Discrete control valves operate in two distinct configurations, making them binary. They are two-position devices, switching between two states: when energised, the spool moves to one position and routes flow accordingly; when de-energised, it shifts to the other position, routing flow in the alternate way or blocking it. Because there are only these two possible configurations, the valve has two states. This two-state, on/off behavior is what sets discrete control valves apart from valves that can provide multiple or continuous flow positions.