Balanced air loaded air pressure regulator

Claim 1

IN AN AIR PRESSURE REGULATOR ADAPTED TO BE INSERTED BETWEEN A SUPPLY SERVICE SUPPLYING GAS UNDER PRESSURE AND A UTILIZATION APPARATUS OR SYSTEM; SAID AIR PRESSURE REGULATOR COMPRISING A FIRST AND A SECOND REGULATOR CONSISTING RESPECTIVELY OF A PILOT REGULATOR AND A MAIN REGULATOR, EACH OF SAID FIRST AND SECOND REGULATORS COMPRISING A REFERENCE PRESSURE CHAMBER AND A REGULATED PRESSURE CHAMBER, SAID TWO CHAMBERS BEING SEPARATED BY A MOVABLE WALL; TWO REGULATING VALVES; TWO NEEDLES, THE ENDS OF EACH OF SAID NEEDLES BEARING RESPECTIVELY ON THE MOVABLE WALL AND THE REGULATING VALVE OF EACH OF SAID REGULATORS; EACH OF SAID REGULATING VALVES COMPRISING A VALVE HOUSING HAVING A LATERAL WALL AND AN END WALL, A VALVE SLIDE MOVABLE INSIDE SAID VALVE HOUSING, FRICTIONLESS GUIDING MEANS INTERPOSED BETWEEN SAID VALVE SLIDE AND THE LATERAL WALL OF SAID VALVE HOUSING AND BELLOWS INTERPOSED BETWEEN SAID VALVE SLIDE AND THE END WALL OF SAID VALVE HOUSING; SAID VALVE SLIDE HAVING AN ANNULAR END AND SAID REGULATING VALVE FURTHER COMPRISING A FIXED ANNULAR SEATING SPACED FROM SAID ANNULAR END BY A SMALL REGULATABLE ANNULAR INTERVAL, INNER CONDUIT MEANS COMMUNICATING WITH THE INSIDE OF SAID ANNULAR INTERVAL AND WITH THE REGULATED PRESSURE CHAMBER OF THE CORRESPONDING REGULATOR, AND OUTER CONDUIT MEANS COMMUNICATING WITH THE OUTSIDE OF SAID ANNULAR INTERVAL AND ADAPTED TO BE CONNECTED TO SAID SUPPLY DEVICE FOR COMMUNICATION THEREWITH.