Self-closing stop valve

Claim 1

IN A VALVE, A BODY HAVING A PASSAGEWAY THERETHROUGH, AN INLET ADJACENT ONE END OF SAID PASSAGEWAY, AN OUTLET ADJACENT THE OTHER END OF SAID PASSAGEWAY, A PARTITION IN SAID PASSAGEWAY BETWEEN SAID INLET AND OUTLET, SAID PARTITION HAVING AN OPENING THERETHROUGH, FIRST AND SECOND SEATS RESPECTIVELY ON THE INLET AND OUTLET SIDES OF SAID PARTITION AND SURROUNDING SAID OPENING, AN ELONGATED RESILIENT PRIMARY SEALING ELEMENT DISPOSED IN SAID PASSAGEWAY ON THE INLET SIDE OF SAID PARTITION, ONE END OF SAID PRIMARY SEALING ELEMENT BEING FIXED WITH RESPECT TO SAID BODY, MEANS TO MOVE THE OPPOSITE END OF SAID PRIMARY SEALING ELEMENT INTO AND OUT OF SEALING ENGAGEMENT WITH SAID FIRST SEAT, THE PASSAGEWAY BEING SO CONSTRUCTED AND ARRANGED THAT THE PATH OF FLOW FROM SAID INLET TO SAID OPENING IN THE PARTITION IS DIRECTED AT SAID SEALING ELEMENT AT AN ABRUPT ANGLE TO THE AXIS OF ELONGATION OF SAID SEALING ELEMENT, RIGID ELONGATED PROTECTIVE SHIELD MEANS IN SAID PASSAGEWAY BETWEEN SAID PRIMARY SEALING ELEMENT AND SAID INLET CONSTRUCTED AND ARRANGED TO SHIELD SAID PRIMARY SEALING ELEMENT FROM IMPINGING FLOW BY DIVERTING SAID FLOW TO A DIRECTION AXIALLY OF SAID SEALING ELEMENT AND TOWARD SAID OPENING IN THE PARTITION, AN AUXILIARY SEALING ELEMENT DISPOSED IN SAID PASSAGEWAY ON THE OUTLET SIDE OF SAID PARTITION, AND MEANS TO MOVE SAID AUXILIARY SEALING ELEMENT INTO AND OUT OF SEALING ENGAGEMENT WITH SAID SECOND SEAT.