Rotary valve with tapered seat

Claim 1

A ROTARY VALVE ASSEMBLY COMPRISING A VALVE HOUSING HAVING A CHAMBER THEREIN, A VALVE SEAT MEMBER AT ONE END OF SAID CHAMBER AND A VALVE SEAL MEMBER AT THE OTHER END OF SAID CHAMBER, A VALVE INLET PORT THROUGH SAID VALVE SEAT MEMBER, AN OUTLET PORT FROM SAID CHAMBER BETWEEN SAID MEMBERS, A VALVE MEMBER ROTATABLY DISPOSED IN SAID CHAMBER AND INCLUDING AN AXIAL VALVE STEM, A VALVE HEAD ON ONE END OF SAID STEM HAVING A VALVE SURFACE COMPLEMENTARY TO AND ROTATABLY ENGAGING SAID VALVE SEAT MEMBER AND HAVING A VALVE PORT THERETHROUGH REGISTRABLE WITH SAID VALVE INLET PORT, A SEALING HEAD ON SAID VALVE STEM COMPLEMENTARY TO AND ROTATABLY ENGAGING SAID SEAL MEMBER, SAID STEM HAVING A HANDLE THEREON EXTERIOR OF SAID HOUSING, A PACKING GLAND ON SAID HOUSING ENGAGING SAID SEAL MAMBER AND ADJUSTABLY PRESSING THE LATTER AGAINST SAID SEALING HEAWD AND SAID VALVE HEAD AGAINST SAID VALVE SEAT MEMBER, SAID HOUSING HAVING AN END WALL AT ONE END, SAID END WALL HAVING A CIRCULAR FLAT SURFACE COMPRISING ONE END OF SAID CHAMBER, SAID SURFACE INCLUDING A RECESS RECEIVING A PROJECTION UPON SAID VALVE SEAT MEMBER THEREBY PREVENTING ROTATION OF THE LATTER, SAID VALVE INLET PORT COMPRISING REGISTERING BORES IN SAID END WALL AND IN SAID VALVE SEAT MEMBER, SAID REGISTERING BORE EXTENDING THROUGH SAID PROJECTION.