Double lever-fulcrum control device for controlling the opening and closing of a fluid valve

A control device for controlling the opening and closing of a fluid valve of the type having a thrust element movable from a first open valve position to a second closed valve position, said control device being of the double lever-fulcrum type having a longer power lever and a shorter thrust lever fixed together to pivot about a fulcrum to move said thrust element from said first position to said second position upon the application of a force to said power lever, the improvement comprising:

• a control lever body fixed to the body of said valve, said control lever body having therein a first opening for receipt of at least a portion of said thrust element, said control lever body having therein a second opening transverse to said first opening;
• a single solid cylindrical shaft mounted to rotate about the longitudinal axis thereof at a position adjacent to said thrust element, said fulcrum comprising said longitudinal axis of said shaft, said shaft rotatably mounted in said second opening of said control lever body;
• said shaft having therein a notch providing a flat surface having first and second end edges on the periphery of said shaft, said flat surface being a diameter of said shaft passing through said longitudinal axis, said first end edge of said surface contacting said thrust element, said thrust lever comprising a radius of said shaft extending from said longitudinal axis to said first end edge of said surface;
• and
• said power lever being fixed to said shaft to extend outwardly from said periphery thereof.