I was wondering about replacing my Ball valve which is essentially on/off with some sort of variable type if one exists - rational being that I feel I'm wasting a lots of water whilst scrubbing ie I want the pressure turned down say the equiv of 19 on the digiflow but I want 40 whilst rinsing ...is there a valve that could regulate the flow down if i had the pump set at 40 without damaging the pump ? This applies especially on wash downs where you need to higher pressure on the gutters but eonly need a dribble whilst scrubbing and its too far (time consuming) to keep walking back to the digiflow to adjust... Does this make sense ?! Thoughts, ideas/suggestions please !