Vacuum breakers

Claim 1

IN A VACUUM BREAKER FOR A WATER SUPPLY SYSTEM, A TUBULAR CASING HAVING AIR PORTS AROUND THE SIDES THEREOF, A BAFFLE MEMBER IN SAID TUBULAR CASING HAVING WATER PORTS THEREIN, A FLEXIBLE SLEEVE VALVE MEMBER IN SAID TUBULAR CASING ARRANGED BETWEEN SAID TUBULAR CASING AND SAID BAFFLE MEMBER, MEANS FOR CLAMPING SAID BAFFLE MEMBER AND SAID FLEXIBLE SLEEVE VALVE MEMBER TOGETHER TO THE INLET END OF SAID TUBULAR CASING, SAID FLEXIBLE SLEEVE VALVE MEMBER OPERATIVE RESPONSIVE TO WATER FLOW THROUGH SAID WATER PORTS TO PREVENT LEAKAGE THROUGH SAID AIR PORTS, AND OPERATIVE RESPONSIVE TO A VACUUM CONDITION TO PREVENT BACK SYPHONAGE THROUGH SAID WATER PORTS, SAID FLEXIBLE SLEEVE VALVE MEMBER HAVING NORMALLY CLOSED OUTLET END WITH SIDE PORTIONS TAPERED INWARD AND BEING PROVIDED WITH A PLURALITY OF SPACED SLITS IN THE CLOSED OUTLET END, THE SLITS BEING FORMED IN THICKENED END LIP PORTIONS ARRANGED BETWEEN THE TAPERED PORTIONS AND EXTENDING TRANSVERSELY OF SAID OUTLET END, THE OUTER EDGES OF SAID END LIP PORTIONS EXTENDING OUTWARD FROM THE OUTER WALL OF SAID SLEEVE MEMBER AND BEING IN CONTACT WITH THE INNER WALL OF SAID TUBULAR CASING, WHEREBY THE OUTER SIDE WALL OF SAID FLEXIBLE SLEEVE VALVE MEMBER IS SPACED FROM THE INNER WALL OF SAID TUBULAR CASING TO PROVIDE FOR ENTRY OF AIR FROM SAID AIR PORTS AND BELOW SAID SLEEVE VALVE MEMBER, SAID OUTER EDGES ALSO SERVING TO STIFFEN SAID LIP PORTIONS TO SLIGHTLY DELAY OPNING OF SAID SLITS UPON WATER FLOW TO INSURE THAT THE SIDE WALLS OF SAID SLEEVE VALVE MEMBER CLOSE INITIALLY UPON SAID AIR PORTS AND PREVENT LEAKAGE THERETHROUGH.