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Apparatus for delaying initiation of a successive flush cycle in a plumbing system utilizing a diaphragm flush valve having an improved relief valve assembly structured to delay after initiation of an initial flushing cycle the resetting of the relief valve sleeve member in a position for a successi

Apparatus for delaying initiation of a successive flush cycle in a plumbing system utilizing a diaphragm flush valve having an improved relief valve assembly structured to delay after initiation of an initial flushing cycle the resetting of the relief valve sleeve member in a position for a successive operative contact by the flush valve plunger pin.

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[ What I claim is:] [18.]18. A method for operation of a plumbing system for delivering a pre-determined amount of fluid, said plumbing system comprising a diaphragm flush valve having a body provided with an inlet section forming an inlet chamber connectable to a pressurized water supply and provid

[ What I claim is:] [18.]18. A method for operation of a plumbing system for delivering a pre-determined amount of fluid, said plumbing system comprising a diaphragm flush valve having a body provided with an inlet section forming an inlet chamber connectable to a pressurized water supply and provided with an outlet section forming an outlet chamber through which the fluid exits said diaphragm flush valve, a relief valve positioned to control the flow of said fluid between said inlet chamber and said outlet chamber, said relief valve having a relief valve stem extending vertically into said outlet chamber and having a relief valve sleeve extending at least partially about said relief valve stem to permit said relief valve sleeve to slide vertically over said relief valve stem, said sleeve member being constructed to have a density less than said fluid, said relief valve separating said inlet chamber and said outlet chamber to permit flow of the fluid from said inlet chamber into said outlet chamber upon activation of said relief valve by a plunger pin, a discharge pipe attached to said outlet section to receive the fluid exiting said diaphragm flush valve, a vacuum breaker assembly positioned in said discharge pipe to receive the fluid flowing from said diaphragm flush valve and through said discharge pipe, said vacuum breaker assembly having an elastomeric inner liner forming an upstream opening and forming lip seals having at least one openable slit at the discharge end, wherein said elastomeric inner liner contains two openings each spaced a different distance from said lip seals and positioned between said upstream opening and said at least one openable slit to permit substantially all of any water in said outlet chamber to drain therefrom when said at least one openable slit is closed, comprising:(a) attaching said inlet section to said pressurized water supply,(b) activating of said plunger pin unseating said relief valve to fill said outlet chamber with said fluid and to float said relief valve sleeve to a position above said plunger pin,(c) draining by gravity at a predetermined rate a sufficient amount of said fluid from said outlet chamber through at least one of said two openings in said elastomeric inner liner to cause said relief valve sleeve to fall to a position for activation by said plunger pin.