A rotational valve includes a valve closure element, a shaft, at least one detection element, at least one detection engagement means, at least one first stop and at least one second stop. The shaft is linked to the valve closure element and the shaft can rotate between a closed position and a fully open position. Each detection element comprises an aperture and an indicator element, the shaft extends through the aperture of at least one detection element, and each detection element is in sliding engagement with the shaft. The shaft can rotate relative to the detection element, each indicator element can move between a first and a second indicator position, each indicator element abuts a first stop when in the first indicator position and abuts a second stop when in the second indicator position.