Valve closure for tubes

Claim 1

IN A CLOSURE FOR A COLLAPSIBLE CONTAINER COMPOSED OF A CONTAINER NECK HAVING A CIRCULR, EDGE AROUND A NECK OPENING AND FORMING A VALVE SEAT, A SINGLE PIECE MEMBER HAVING A VALVE HEAD, A VALVE STEM AND SPRING ARMS MOUNTED IN SAID CONTAINER NECK WITH SAID VALVE HEAD BEING SEATABLE ON SAID VALVE SEAT AND WITH SAID SPRING ARMS EXTENDING ACROSS SAID TUBE NECK TO ENGAGE THE INNER WALL OF SAID NECK FOR BEING DEFORMABLE BY PRESSURE APPLIED TO THE CONTENTS IN THE CONTAINER AND THUS TO LIFT THE VALVE HEAD FROM THE VALVE SEAT, THE IMPROVEMENT IN WHICH SAID VALVE HEAD COMPRISES AN INVERTED CONICAL VALVE SEAT PORTION AND AN UPRIGHT CONICAL HEAD PORTION, SAID VALVE SEAT BEING OF COMPLEMENTAL CONICAL SHAPE FOR SEATING SAID INVERTED CONICAL VALVE SEAT PORTION OF SAID VALVE HEAD, A CAP THREADEDLY ENGAGED TO SAID CONTAINER NECK AND HAVING A CONICALLY SHAPED WALL PORTION ENGAGEABLE WITH SAID UPRIGHT CONICAL HEAD PORTION OF SAID VALVE HEAD AND A CYLINDRICAL WALL PORTION EXTENDING FROM SAID CONICALLY SHAPED WALL PORTION OUTWARDLY THROUGH AN OUTLET ORIFICE PORTION OF SAID CAP FOR FORMING A SMOOTH HOLLOW TUBE OF THE CONTENTS EXTRUDED FROM SAID CONTAINER THROUGH SAID OUTLET ORIFICE PORTION, AND SAID VALVE HEAD BEING NORMALLY CLOSED BY SAID SPRING ARMS AND LOCKED CLOSED BY THE PRESSURE OF SAID CAP ON SAID UPRIGHT CONICAL HEAD PORTION OF SAID VALVE HEAD.