Modulating input control for a gas appliance

Claim 1

IN A GAS APPLIANCE, A MODULATING GAS VALVE COMPRISING A VALVE BODY HAVING AN INTERNAL CAVITY AND HAVING AND INLET AND AN OUTLET, WALL STRUCTURE SEPARATING THE INTERNAL CAVITY INTO TWO CHAMBERS COMMUNICATING, RESPECTIVELY, WITH THE INLET AND OUTLET, SAID WALL STRUCTURE HAVING THEREON A VALVE SEAT HAVING AT LEAST TWO COMMUNICATING THROUGH-OPENINGS BETWEEN THE CHAMBERS, A VALVE PLATE COOPERATING WITH THE VALVE SEAT AND HAVING AT LEAST TWO OPENINGS ADAPTED IN VARIOUS OPERATIVE POSITIONS THEREOF TO DEFINE WITH THE VALVE SEAT OPENINGS, RESPECTIVELY, A CONTINUOUS INTERNAL PASSAGEWAY AND AN OPENED-CLOSED INTERNAL PASSAGEWAY BETWEEN THE CHAMBERS, MEANS INCLUDING A CAM MEMBER COOPERATING WITH THE VALVE PLATE TO COVER IN VARYING DEGREES THE CONTINUOUSLY PROVIDED PASSAGEWAY TO VARY THE EFFECTIVE FLOW OPENING THEREOF, AND MEANS TO ACTUATE THE CAM MEMBER AND THE VALVE PLATE IN A PREDETERMINED MANNER TO MODULATE THE PASSAGEWAY OPENINGS FOR AFFECTING VARIOUS GAS VOLUME INPUTS TO THE GAS APPLIANCE.