Clack-valve plug, more particularly for cooling radiators of motor vehicles

Claim 1

A REMOVABLE CAP FOR A SPOUT OF AN ENGINE COOLING RADIATOR HAVING A LATERAL DISCHARGE HOLE, COMPRISING A CAP HAVING AN UPPER COVERING PORTION ARRANGED TO FIT THE TOP OF SAID SPOUT SAID UPPER COVERING PORTION BEING PERIPHERALLY SHAPED TO ENABLE SUCCESSIVELY LOCKING AND RELEASING OF SAID CAP FROM SAID SPOUT BY ROTATION OF SAID CAP, A DOWNWARDLY EXTENDING EXTENSION HAVING A BORE OPEN TO THE INTERIOR AND EXTERIOR OF THE CAP PROVIDED CENTRALLY ON SAID UPPER PORTION, A RESILIENT THIN SUBSTANTIALLY FLAT RING INTEGRAL WITH THE LOWER PORTION OF SAID EXTENSION AND PARALLEL TO SAID UPPER COVERING PORTION, A DOWNWARDLY EXTENDING CROWN SHAPED ELEMENT PROJECTING FROM THE PERIPHERY OF SAID RING AND HAVING A SHARPENED FLEXIBLE LOWER EDGE FOR BEARING AGAINST THE BOTTOM OF SAID RADIATOR SPOUT TO CLOSE THE SPOUT AND PREVENT EXIT OF STEAM THROUGH SAID LATERAL DISCHARGE HOLE, SAID THIN RING AND CROWN SHAPED ELEMENT CONSTITUTING A DISCHARGE VALVE, AN ABUTTING PORTION PROVIDED INWARDLY IN SAID CROWN SHAPED ELEMENT AND A RESILIENT DIAPHRAGM CARRIED BY SAID ABUTTING PORTION TO CLOSE THE BORE OF SAID EXTENSION AND CONSTITUTING AN AIR INLET VALVE.