Flush valves

Claim 1

IN A FLUSH VALVE, THE COMBINATION COMPRISING, A HOUSING STRUCTURE HAVING A WATER INLET OPENING AND A WATER OUTLET OPENING, A FIRST CONDUIT WITHIN SAID HOUSING STRUCTURE AND COMMUNICATING AT ONE END WITH SAID OUTLET OPENING, A SECOND CONDUIT WITHIN SAID HOUSING STRUCTURE HAVING A GREATER CROSS-SECTIONAL SIZE THAN SAID FIRST CONDUIT AND SURROUNDING SAID FIRST INLET OPENING AND THE SPACE BETWEEN BETWEEN SAID WATER INLET OPENING AND THE SPACE BETWEEN SAID FIRST AND SECOND CONDUITS, THE OTHER END OF SAID FIRST CONDUIT PROVIDING A VALVE SEAT, A VALVE CAP MEMBER FREELY MOVABLE WITHIN SAID HOUSING STRUCTURE, SAID VALVE CAP MEMBER COMPRISING A RESILIENT WASHER ARRANGED TO SEAT AGAINST SAID VALVE SEAT FROM TIME TO TIME UPON MOVEMENT OF SAID VALVE CAP MEMBER, SAID WASHER COMPRISING A SUBSTANTIALLY FLAT ANNULAR PERIPHERAL PORTION, A CENTRAL CYLINDRICAL PORTION AND AN OUTER FRUSTO-CONICAL PORTION COAXIAL WITH SAID FIRST CONDUIT, SAID CENTRAL CYLINDRICAL PORTION HAVING A DIAMETER SLIGHTLY LESS THAN THE INSIDER DIAMETER OF SAID FIRST CONDUIT, AND BEING ARRANGED TO FIT WITHIN SAID FIRST CONDUIT WHEN SAID WASHER IS SEATED AGAINST SAID VALVE% SEAT, SAID VALVE CAP MEMBER HAVING A PERIPHERAL SLEEVE PORTION ARRANGED IN CLOSELY SPACED SURROUNDING RELATION WITH RESPECT TO THE OUTER WALL OF SAID SECOND CONDUIT, A CHAMBER WITHIN SAID HOUSING STRUCTURE AT THE OTHER SIDE OF SAID VALVE CAP MEMBER, SAID SPACE BETWEEN THE PERIPHERAL SLEEVE PORTION OF SAID CAP MEMBER AND SAID OUTER WALL OF SAID SECOND CONDUIT PROVIDING A PASSAGEWAY COMMUNICATING BETWEN SAID FIRST AND SECOND CONDUITS AND SAID CHAMBER FOR BY-PASSING TO SAID CHAMBER WATER UNDER PRESSURE FROM SAID INLET OPENING, AND MEANS TO TEMPORARILY RELEASE THE PRESSURE OF WATER IN SAID CHAMBER TO ALLOW MOVEMENT OF SAID VALVE CAP MEMBER AWAY FROM SAID VALVE SEAT FOR FLUSHING ACTION THROUGH SAID FIRST CONDUIT, THE INTERIOR WALL OF SAID PERIPHERAL SLEEVE PORTION OF SAID VALVE CAP MEMBER BEING FORMED AT ITS INNER END WITH A REDUCED DIAMETER PORTION SUBSTANTIALLY CO-EXTENSIVE WITH THE LENGTH OF SAID CENTRAL CYLINDRICAL PORATION OF SAID WASHER, WHEREBY SAID BYPASSING SPACE IS AUTOMATICALLY SUBSTANTIALLY REDUCED IN AREA JUST PRIOR TO THE SEATING OF SAID WASHER AGAINST SAID VALVE SEAT.