Rotary valve

Claim 1

A MATERIAL HANDLING VALVE COMPRISING A SHELL FORMING A TAPERED PASSAGE OPENING FROM EITHER END OF SAID SHELL, A MATING TAPERED ROTOR HOUSED IN SUCH SHELL, SHAFT MEANS PROJECTING RELATIVE EITHER END OF SAID ROTOR, MEANS ANCHORED TO ONE END OF SAID SHELL FORMING A SEAL ABOUT THE PROJECTED END OF SAID SHAFT MEANS ADJACENT THE ROTOR PORTION OF MINIMAL CROSS-SECTIONAL DIMENSION, MEANS FORMING AN AXIAL EXTENSION OF THE END OF SAID SHAFT WHICH PROJECTS RELATIVE SAID SEAL, MEANS INDEXING SAID EXTENSION TO SAID SHAFT ACCOMMODATING THEIR RELATIVE AXIAL DISPLACEMENT BUT PREVENTING THEIR RELATIVE ROTATION, A SINGLE ACCESSIBLE ELEMENT ENGAGING TO SAID SHAFT AND HOLDING SAID AXIAL EXTENSION FROM AXIAL DISPLACEMENT RELATIVE TO SAID SHAFT, MEANS ROTATABLY MOUNTING ABOUT SAID AXIAL EXTENSION AND CONTAINED AGAINST ENDWISE MOVEMENT RELATIVE THERETO, AND RELATIVELY FIXED NUT-LIKE MEANS IN CONNECTION WITH SAID SEALING MEANS THREADEDLY RELATED TO THE MEANS ABOUT SAID AXIAL EXTENSION WHEREBY ON ROTATION OF SAID LATTER MEANS THERE IS PRODUCED THEREBY AN AXIAL MOVEMENT OF SAID AXIAL EXTENSION AND SAID SHAFT DUE TO THE CONTAINMENT OF SAID EXTENSION TO SAID SHAFT BY SAID SINGLE ELEMENT AND MEANS FORMING A SEAL ABOUT THE OPPOSITE EXTREMITY OF SAID SHAFT MEANS FORMING A CLOSURE ELEMENT FOR SAID SHELL WHICH ON RELEASE THEREOF AND RELEASE OF THE SINGLE ELEMENT SAID SHAFT MEANS FORMING A CLOSURE ELEMENT OF SAID SHELL WITHOUT DISTURBING THE FIRST MENTIONED SEALING MEANS OR SAID AXIAL EXTENSION.