Elastomer seat gate valve

Claim 1

A GATE VALVE COMPRISING: A BODY WHICH INCLUDES A CHEST PORTION, SAID CHEST PORTION INCLUDING SPACED PARALLEL CHEST WALLS FORMED WITH ALIGNED HOLES, SAID BODY HAVING SPACED, ALIGNED, TUBULAR MEMBERS CONNNECTED TO SAID CHEST IN ALIGNMENT WITH SAID HOLES, EACH MEMBER HAVING AN INNER SURFACE DEFINING A FLOW PASSAGE, THE PORTIONS OF SUCH FLOW PASSAGES WHICH ARE LOCATED NEXT TO SAID CHEST BEING CIRCULAR AND OF THE SAME DIAMETER, A PAIR OF SEPARATE SEAT MEMBERS EACH DISPOSED IN SAID CHEST AND EACH HAVING A CIRCULAR PORT THEREIN OF THE SAME SIZE AS SAID FLOW PASSAGES, MEANS RELEASABLY SUPPORTING SAID SEAT MEMBERS IN SAID CHEST WITH SAID PORTS ALIGNED WITH ONE ANOTHER AND WITH SAID FLOW PASSAGES SO THAT THE SURFACES OF SAID SEAT MEMBERS WHICH DEFINE SAID PORTS FORM CONTINUATIONS OF THE INNER SURFACES OF SAID TUBULAR MEMBERS, EACH SEAT MEMBER HAVING A FLAT ELASTMOER BODY PORTION FROM ONE SIDE OF WHICH INTEGRALLY PROJECTS A CIRCULAR ELASTOMER BEAD, THE BEAD OF A SEAT MEMBER BEING IN CONCENTRIC RELATION TO THE PORT OF SUCH MEMBER AND THE INNER DIAMETER OF SAID BEAD BEING THE SAME AS THAT OF SUCH PORT, SAID SEAT MEMBERS BEING ARRANGED WITH THE BEAD PORTIONS THEREOF IN OPPOSED RELATIONSHIP, A GATE BLADE MOUNTED FOR MOVEMENT FROM AN OPEN POSITION TO A CLOSED POSITION WHERE IT IS DISPOSED BETWEEN SAID BEADS IN COMPRESSED RELATION WITH EACH, EACH SEAT MEMBER HAVING A RIGID ANNULAR REINFORCING STRUCTURE EMBEDDED THEREIN, AND THE FACE OF THE BODY PORTION OF EACH SEAT MEMBER WHICH IS REMOTE FROM THE ASSOCIATED BEAD HAVING A SERIES OF RECESSES FORMED THEREIN TO FACILITATE COMPRESSION OF THE OUTER PORTIONS OF SAID BODY PORTION TO THEREBY AVOID EXCESSIVE COMPRESSION OF THE ASSOCIATED BEAD.