Vacuum breaker

Claim 1

A VACUUM BREAKER AND BACK FLOW PREVENTION MEANS COMPRISING AN INLET BODY MEMBER; A HOLLOW CHAMBER FORMED IN SAID BODY MEMBER; A TRANSVERSE SUBSTANTIALLY PLANE WEB-LIKE PARTITION FORMED IN SAID HOLLOW CHAMBER, SAID WEB-LIKE PARTITION HAVING A VALVE SURFACE AT ITS UNDERSIDE, AND HAVING A FLOW PORT THERETHROUGH; AN OUTLET BODY MEMBER PROVIDED WITH AN OUTLET OPENING; A HOLLOW CHAMBER FORMED IN SAID OUTLET MEMBER; AN ANNULAR SEATING EDGE FORMED AT THE TOP PORTION OF SAID HOLLOW CHAMBER OF SAID OUTLET MEMBER, SAID ANNULAR SEATING EDGE PROJECTING TOWARD THE VALVE SURFACE OF SAID TRANSVERSE WEB-LIKE PARTITION OF SAID INLET BODY MEMBER; A MULTIPLICITY OF VENT PORTS SURROUNDING SAID ANNULAR SEATING EDGE, SAID VENT PORTS AFFORDING COMMUNICATION BETWEEN SAID HOLLOW CHAMBER OF SAID OUTLET MEMBER AND ATMOSPHERE; A FLEXIBLE RESILIENT SUBSTANTIALLY PLANE DIAPHRAGM MEMBER CLAMPED AT ITS PERIPHERY BETWEEN SAID INLET BODY MEMBER AND SAID OUTLET BODY MEMBER, THE CENTRAL PORTION OF SAID DIAPHRAGM MEMBER HAVING LIMITED FREEDOM OF MOTION BETWEEN THE VALVE SURFACE OF SAID TRANSVERSE WEB-LIKE PARTITION OF SAID INLET BODY MEMBER AND THE ANNULAR SEATING EDGE OF SAID OUTLET BODY MEMBER; PORT MEANS THROUGH SAID DIAPHRAGM MEMBER AT ITS CENTRAL PORTION TO PERMIT LIQUID TO FLOW THROUGH SAID DIAPHRAGM MEMBER UNDER INLET PRESSURE; AN AXIALLY MOVABLE SPRING PRESSED COMBINATION DIAPHRAGM PORT CLOSING AND DIAPHRAGM SUPPORT MEMBER POSITIONED IN SAID HOLLOW CHAMBER FORMED IN SAID OUTLET MEMBER; AN AUTOMATIC PRESSURE-RELIEF AND DRAIN VALVE MEANS CONNECTED TO SAID OUTLET OPENING OF SAID OUTLET BODY MEMBER, SAID PRESSURE-RELIEF AND DRAIN VALVE MEANS COMPRISING A TRANSVERSE SUBSTANTIALLY PLANE WEB-LIKE PARTITION FORMED AT THE BOTTOM OF SAID OUTLET OPENING OF SAID OUTLET BODY MEMBER, SAID WEB-LIKE PARTITION HAVING A FLOW PORT THERETHROUGH AND A VALVE SURFACE AT ITS UNDERSIDE; A BODY MEMBER; A FLEXIBLE RESILIENT SUBSTANTIALLY PLANE PRESSURE-RELIEF AND DRAIN VALVE DIAPHRAGM MEMBER CLAMPED AT ITS OUTER PERIPHERY BETWEEN THE LOWER END OF SAID OUTLET BODY MEMBER AND A SEAT FORMED IN THE UPPER PART OF SAID BODY MEMBER OF SAID PRESSURE-RELIEF AND DRAIN VALVE MEANS; AN ANNULAR SEATING EDGE FORMED AT THE TOP PORTION OF SAID BODY MEMBER OF SAID PRESSURE-RELIEF AND DRAIN VALVE MEANS, SAID ANNULAR SEATING EDGE PROJECTING TOWARD SAID VALVE SURFACE OF SAID WEB-LIKE PARTITION FORMED AT THE BOTTOM OF SAID OUTLET OPENING OF SAID OUTLET BODY MEMBER; A MULTIPLICITY OF VENT PORTS SURROUNDING SAID LAST MENTIONED ANNULAR SEATING EDGE, SAID LAST MENTIONED VENT PORTS AFFORDING COMMUNICATION BETWEEN ATMOSPHERE AND A HOLLOW OUTLET CHAMBER FORMED IN THE LOWER PART OF SAID BODY MEMBER OF SAID PRESSURE-RELIEF AND DRAIN VALVE MEANS; SELF CLOSING PORT MEANS THROUGH SAID DIAPHRAGM OF SAID PRESSURE-RELIEF AND DRAIN VALVE MEANS, SAID SELF CLOSING PORTS BEING ADAPTED TO OPEN UNDER INLET LIQUID PRESSURE TO PERMIT LIQUID TO FLOW THROUGH SAID LAST MENTIONED DIAPHRAGM, THE CENTRAL PORTION OF WHICH HAVING LIMITED FREEDOM OF MOTION BETWEEN ITS ANNULAR SEATING SURFACE AND ITS VALVE SURFACE AT THE UNDERSIDE OF SAID WEBLIKE PARTITION FORMED AT THE BOTTOM OF SAID OUTLET OPENING OF SAID OUTLET BODY MEMBER.