Patent ID: 6408873
Filing Date: 2002-06-25
Classification: E03D,F16K,Y10T

Abstract:
A flush valve for use with urinals or water closets including:a hollow valve body having an inlet, an outlet and a valve seat between the inlet and the outlet; a piston assembly movable in said hollow valve body to a closing position on said valve seat to control fluid flow between said inlet and said outlet; a pressure chamber above the piston assembly for holding said piston assembly on said valve seat; and a bypass passage through said piston assembly to fluidly connect said inlet with said pressure chamber to provide fluid to move said piston assembly to said closing position, the bypass passage including filtering means and an orifice, said filtering means including multiple filters in fluid flow series connecting said inlet with said orifice, said multiple filters including a plurality of individual filtering slots disposed in a plurality of concentric annular arrays, the cross sectional opening of the individual filtering slots in each annular array being smaller than the cross sectional openings of the individual filtering slots of the concentrically adjacent array of filtering slots, the individual filtering slots in the annular arrays being radially oriented and circumferentially offset from the individual filtering slots in the concentrically adjacent annular array of filtering slots.