What type of turn does a rotary valve make to move from fully closed to fully open?

A rotary valve operates with a quarter-turn mechanism, meaning that it requires a 90° rotation to transition from a fully closed position to a fully open position. This design allows for efficient and rapid opening and closing of the valve, making it an ideal choice for systems that need to control fluid flow swiftly.

In a fully closed state, the internal components of the valve direct flow to a blockage, and rotating it 90° moves those components to align with the flow path, thereby allowing fluid to pass through with minimal resistance. This simple yet effective mechanism contributes to the common use of rotary valves in various applications where precise control of flow is essential.