Plug valve for flow lines

Claim 1

A ROTATABLE PLUG VALVE FOR FLOW LINES COMPRISING AN OUTER HOLLOW BODY OF GENERALLY CYLINDRICAL CONFIGURATION HAVING TWO SETS OF PAIRED DIAMETRICALLY-OPPOSITE APERTURES EXTENDING THROUGH ITS CYLINDRICAL WALL, THE CENTER LINES OF ALL OF SAID APERTURES LYING SUBSTANTIALLY IN A COMMON PLANE; AN INNER SUBSTANTIALLY CYLINDRICAL HOLLOW PLUG BODY MOUNTED FOR ROTATION WITHIN SAID OUTER BODY, AN IMPERFORATE PIPE EXTENDING ENTIRELY THROUGH SAID INNER BODY IN A DIRECTION PERPENDICULAR TO THE LONGITUDINAL AXIS OF THE CYLINDER AND SEALED THROUGH THE CYLINDRICCAL WALL THEREOF, THE BORE OF SAID PIPE PROVIDING THROUGH SAID INNER BODY A CONTINUOUS, UNINTERRUPTED PASSAGE WHOSE CENTER LINE LIES SUBSTANTIALLY IN SAID PLANE WHEN SAID VALVE IS ASSEMBLED; AND MEANS FOR ROTATING SAID INNER BODY WITH RESPECT TO SAID OUTER BODY TO VARIOUS ANGULAR POSITIONS, IN A FIRST OF WHICH SAID PASSAGE IS ALIGNED WITH ONE SET OF DIAMETRICALLY-OPPOSITE APERTURES IN SAID OUTER BODY AND IN A SECOND OF WHICH SAID PASSAGE IS ALIGNED WITH THE OTHER SET OF DIAMETRICALLY-OPPOSITE APERTURES IN SAID OUTER BODY; THE CYLINDRICAL WALL OF SAID INNER BODY HAVING THEREIN A PAIR OF DIAMETRICALLY-OPPOSITE APERTURE SO LOCATED THAT WHEN SAID INNER BODY IS IN SAID FIRST ANGULAR POSITION, THE TWO APERTURES IN SAID INNER BODY COMMUNICATE RESPECTIVELY WITH THE TWO APERTURES IN SAID OTHER SET OF OUTER BODY APERTURES.