A "Sloan Valve" is the well known valve used on (primarily) commercial toilets and urinals. Touching the chrome handle causes the toilet to flush, violently washing your troubles down the drain. What does that handle do and what makes the toilet flush with such great force? If you look closely, the pipe coming into the valve is much larger in diameter than an ordinary toilet's pipe. This is the secret to the Sloan Valve. The normal water pressure in the building pressurizes the big pipe and when the famous chrome handle is moved, the water in the big pipe is allowed to dump all at once into the toilet. When most of the water pressure in the big pipe is depleted the chrome handle resets and the water stops flowing. If the toilet had a small pipe like most other toilets, the large water volume would not be possible, and the high power flush that we have all grown to love would not be possible. So, the Sloan Valve is not the secret at all. It's the large pipe ahead of it that stores all the water and it's associated pressure. The Sloan Valve is just a large valve capable of releasing it all at once.