Gas valve operating structure

Claim 1

IN A VALVE FOR GAS RANGES AND THE LIKE HAVING A BODY WITH A TAPERED CHAMBER WITHIN WHICH A COMPLEMENTALLY TAPERED ROTATABLY VALVE PLUG IS URGE INTO SEATED AND SEALED RELATION BY A SPRING REACTING AGAINST A CAP ON SAID BODY, AND AN OPERATING STEM ON SAID PLUG PROJECTING THROUGH AN OPENING IN SAID CAP TO THE EXTERIOR OF SAID VALVE, IMPROVED STRUCTURE WHEREBY THE AXIAL DISPLACEMENT OF SAID PLUG FROM SAID SEATED RELATION TO SAID CHAMBER IS POSITIVELY LIMITED TO A PREDETERMINED MAXIMUM, SAID STRUCTURE COMPRISING, MEANS PROVIDING A SHOULDER ON SAID STEM AXIALLY SPACED FROM THE TAPERED PORTION OF SAID PLUG, AN INSERT DISPOSED WITHIN SAID CAP OPENING, SAID INSERT HAVING AN EFFECTIVE AXIALLY INNER END DISPOSED TOWARD THE CAP INTERIOR AND AXIALLY ALIGNED WITH SAID SHOULDER, SAID INSERT BEING AXIALLY SHIFTABLE WITHIN SAID OPENING AND SAID EFFECTIVE INNER END THEROF BEING THEREBY AXIALLY ADJUSTABLE TO A PREDETERMINED SPACING RELATIVE TO SAID SHOULDER, SAID INSERT HAVING MEANS EXPOSED TO THE EXTERIOR OF SAID CAP ADAPTED TO RECEIVE INSERT-SHIFTING FORCE, SAID CAP AND INSERT HAVING MEANS COOPERABLE TO SECURE THE SAME FIXEDLY IN THEIR ADJUSTED RELATIVE AXIAL POSITIONS.