Valve for use in a conduit containing carbon black suspended in a gas

Claim 1

IN A CONDUIT CONTAINING CARBON BLACK SUSPENDED IN A GAS, A VALVE COMPRISING, IN COMBINATION, A VALVE BODY HAVING AN INLET PORT AND AN OUTLET PORT THEREIN, SAID INLET PORT BEING IN COMMUNICATION WITH THE CONDUIT CONTAINING THE CARBON BLACK, SAID VALVE BODY HAVING A CENTRAL OPENING THEREIN OF GENERALLY FRUSTO-CONICAL CONFIGURATION, SAID OPENING BEING IN COMMUNICATION WITH SAID PORTS, A FRUSTOCONICAL PLUG DISPOSED WITHIN SAID OPENING, A VALVE STEM EXTENDING FROM SAID PLUG TO A REGION EXTERIOR OF SAID VALVE BODY TO ENABLE SAID PLUG TO BE ROTATED WITHIN SAID VALVE BODY, PACKING MEANS POSITIONED BETWEEN SAID VALVE STEM AND SAID VALVE BODY, SAID PLUG HAVING A PASSAGE THERETHROUGH WHICH COMMUNICATES WITH SAID PORTS WHEN SAID PLUG OCCUPIES A FIRST POSITION IN SAID VALVE BODY, SAID PLUG SUBSTANTIALLY BLOCKING THE OPENING BETWEEN SAID PORTSWHEN SAID PLUG IS ROTATED TO A SECOND POSITION IN SAID VALVE BODY, AND MEANS SECURED TO SAID VALVE BODY AND EXTENDING THEREIN TO ENGAGE SAID PLUG WHEREBY SAID PLUG IS POSITIONED WITH RESPECT TO SAID VALVE BODY SUCH THAT THE 1/32 TO 1/16 OF AN INCH IN SAID SECOND POSITION, THE SPACE BETWEEN THE SIDES OF SAID PLUG AND SAID VALVE BODY BEING FILLED WITH CARBON BLACK WHEN SAID PLUG OCCUPIES SAID SECOND POSITION, SAID CARBON BLACK PREVENTING LEAKAGE THROUGH SAID VALVE.