Double plug valve

Claim 1

A VALVE COMPRISING A BODY HAVING OPPOSED END FACES WITH A THREE LEGGED, Y-SHAPED PASSAGE RUNNING PARALLEL TO THE SAID END FACES, THE SAID Y-SHAPED PASSAGE CONNECTING THREE PORTS SITUATED AT THE EXTREMITES OF THE SAID PASSAGE, A PAIR OF FRUSTO-CONICAL PLUG COCKS, EACH OF THE SAID COCKS BEING PROVIDED WITH A STEM CENTERED UPON, FIXED TO, AND EXTENDING FROM THE END OF SMALLER AREA OF THE SAID COCK EXTENDING FROM THE END OF SMALLER AREA ED ON PARALLEL AXES IN THE SAID BODY IN MATCHING FRUSTOCONICAL BORES TERMINATING AT OPPOSITE FACES OF SAID OPPOSED END FACES AND DISPOSED ACROSS TWO OF THE LEGS OF THE SAID Y-SHAPED PASSAGE ADJACENT TO THE INTERSECTION OF THE SAID LEGS, THE TAPERS OF THE SAID MATCHING PAIRS OF BORES AND COCKS BEING OPPOSED AND EACH SAID COCK CONTAINING A FLOW-THROUGH PASSAGE NORMAL TO ITS AXIS OF ROTATION, ALIGNABLE UPON ROTATION WITH THE LEG OF THE SAID Y-SHAPED PASSAGE ACROSS WHICH THE SAID COCK IS DISPOSED, A REMOVABLE PLATE AT EACH END FACE OF SAID BODY DISPOSED TO COVER EACH TERMINUS OF SAID FRUSTO-CONICAL BORES AND EACH SAID PLATE BEING BORED TO ACCOMMODATE A ROTATABLE PROTRUSION OF SAID STEM FROM SAID BODY, AND REMOVABLE LOCKING MEANS TO RETAIN SAID STEM AND SAID PLATE IN A FIXED RELATION.