Core for pneumatic valve

Claim 1

IN A PENUMATIC VALVE CORE, THE COMBINATION OF A BARREL HAVING A VALVE SEAT AT ONE END INCLUDING AN INWARDLY FACING CYLINDRICAL PART AND A TAPERED PART EXTENDING FROM THE LATTER TO THE EDGE OF THE BARREL AT SAID ONE END, A VALVE PIN MOVABLE AXIALLY IN SAID BARREL AND HAVING AN END PORTION PROJECTING OUT OF SAID ONE END OF THE BARREL, AND AN ELASTOMERIC VALVE MEMBER ON SAID END PORTION OF THE VALVE PIN AND HAVING AN ANNULAR, RADIALLY DIRECTED SHOULDER FACING SAID EDGE OF THE BARREL, A CYLINDRICAL SURFACE PORTION AND A TAPERED SURFACE PORTION BETWEEN THE LATTER AND SAID SHOULDER, SAID CYLINDRICAL AND TAPERED SURFACE PORTIONS BEING DIMENSIONED SO AS TO BE NORMALLY SPACED RADIALLY FROM SAID CYLINDRICAL AND TAPERED PARTS, RESPECTIVELY, UPON INITIAL CONTACT OF SAID SHOULDER WITH SAID EDGE, SAID VALVE MEMBER BEING FORMED OF ELASTOMERIC MATERIAL THAT IS FLOWABLE UNDER A PNEUMATIC PRESSURE APPLIED THERETO, WHEREBY INCREASED AIR PRESSURES URGING SAID VALVE MEMBER AGAINST SAID EDGE CAUSE THE LATTER TO INDENT SAID SHOULDER AND BRING SAID TAPERED PART AND SURFACE PORTION INTO MUTUAL ENGAGEMENT AND FURTHER CAUSE SAID CYLINDRICAL SURFACE PORTION TO BULGE OUTWARDLY INTO ENGAGEMENT WITH SAID CYLINDRICAL PART OF THE SEAT FOR INCREASING THE AREA OF SEALING CONTACT OF SAID VALVE MEMBER WITH SAID SEAT AVAILABLE TO RESIST LEAKAGE THEREBETWEEN OF AIR UNDER SAID INCREASED PRESSURES.