Sheet metal sectional gate valves

Claim 1

A GATE VALVE CONSTRUCTION COMPRISING: A GATE GUIDE CONSISTING OF TWO IDENTICAL ELONGATED HALF SHELLS OF SHEET METAL DISPOSED IN OPPOSING ABUTTING RELATION AND WELDED TOGETHER ALONG COMPLEMENTARY REGISTERING PLANAR EDGE PORTIONS SO AS TO PROVIDE A PERIPHERAL SEAM IN THE PLANE OF THE JUNCTURE, SAID HALF SHELLS BEING OF SUBSTANTIALLY U-SHAPED TRANSVERSE CROSS SECTION SO THAT THEY FORM A HOLLOW CHAMBER THEREBETWEEN SAID HALF SHELLS EACH HAVING AN INTEGRAL, ANNULAR, OUTWARDLY BENT FLANG ADJACENT ONE LONGITUDINAL END THEREOF AND FORMING THE WALL OF A CIRCULAR OPENING, SAID OPENINGS BEING COAXIAL AND SAID FLANGES BEING ALIGNED AND EXTENDING AWAY FROM EACH OTHER, SAID FLANGES HAVING PLANAR OUTER EDGES WHICH ARE PARALLEL WITH SAID PLANE OF JUNCTURE AND ARE SPACED EQUAL DISTANCES THEREFROM AND ARE DISPOSED ON OPPOSITE SIDES THEREOF; A PAIR OF IDENTICAL ONE-PIECE TUBUAR SEAT AND COUPLING MEMBERS EACH OF WHICH IS DISPOSED IN ONE OF SAID OPENING, EACH OF WHICH IS DISPOSED IN ONE OF SAID ING AN ENLARGED OUTER PORTION OF LARGER DIAMETER THAN ITS ASSOCIATED OPENING AND DISPOSED OUTWARDLY THEREOF, AN INTERMEDIATE PORTION OF SUBSTANTIALLY THE SAME EXTERNAL DIAMETER AS THE DIAMETER OF ITS ASSOCIATED OPENING AND SNUGLY CONTACTING THE WALL OF ITS ASSOCIATED OPENING, AND AN INNER PORTION OF SMALLER DIAMETER THAN SAID INTERMEDIATE PORTION, SAID INNER PORTIONS OF SAID MEMBERS HAVING OPPOSING SPACEDAPART END FACES DEFINING OPPOSING VALVE SEATS ONE ON EACH SIDE OF SAID PLANE OF JUNCTURE, EACH MEMBER HAVING A SUBSTANTIALLY RADIALLY EXTENDING ANNULAR SHOULDER BETWEEN SAID OUTER PORTION AND SAID INTERMEDIATE PORTION, SAID SHOULDER BEING RADIALLY OVERLAPPED WITH, DISPOSED OUTSIDE OF, AND ABUTTING SAID OUTER EDGE OF THE FLANGE OF ITS ASSOCIATED OPENING, AND WELDED JOINTS BETWEEN SAID SHOULDERS AND SAID OUTER EDGES WHEREBY SAID MEMBERS ARE UNITED TO SAID GATE GUIDE; A GATE DISPOSED BETWEEN SAID VALVE SEATS AND ADAPTED FOR SIMULTANEOUS SEALING ENGAGING THEREWITH; AND OPERAING MEANS DISPOSED IN SAID CAHMBER FOR MOVING SAID GATE TOWARD AND AWAY FROM SAID VALVE SEATS.