Pressure regulator for pneumatic measuring apparatus

Claim 1

A GAS PRESSURE REGULATOR COMPRISING A HOUSING HAVING A GAS INLET, A GAS OUTLET, AND A GAS PASSAGE CIRCUIT JOINING SAID INLET AND OUTLET, A VALVE OPENING BETWEEN THE GAS INLET AND OUTLET, A RESTRICTED GAS PASSAGE OPENING BETWEEN THE INLET AND OUTLET AND COMMUNICATING WITH THE VALVE OPENING, A MOVABLE VALVE MEMBER IN SAID VALVE OPENING, A PAIR OF GAS CHAMBERS COMMUNICATING WITH SAID OUTLET AND RESPONSIVE TO PRESSURE IN SAID OUTLET, SAID CHAMBERS HAVING RESILIENT WALLS CAPABLE OF EXPANDING AND CONTRACTING IN LENGTH, A FIRST OF SAID CHAMBERS FORMING A PART OF THE GAS PASSAGE CIRCUIT FROM THE VALVE OPENING TO THE OUTLET, THE GAS CHAMBER WALLS BEING CONNECTED TO OPPOSITE ENDS OF SAID VALVE MEMBER AND SUPPORTING THE LATTER, THE SECOND OF SAID CHAMBERS HAVING AN INLET PORT SMALLER THAN SAID GAS OUTLET IN SAID HOUSING TO PRODUCE A PRESSURE DIFFERENTIAL ACROSS SAID VALVE MEMBER, THE FIRST OF SAID CHAMBERS ACTING AGAINST A GREATER AREA THAN THE SECOND CHAMBER, THE GAS CHAMBERS BIASING THE VALVE CONTROL MEMBER IN OPPOSITE DIRECTIONS FOR LONGITUDINAL OSCILLATING MOVEMENT IN RESPONSE TO PRESSURE DIFFERENCES IN THE RESPECTIVE GAS CHAMBERS, THE VALVE MEMBER DURING SAID OSCILLATING MOVEMENT CONTROLLING THE RESPECTIVE VALVE OPENING AND RESTRICTED GAS PASSAGE OPENING IN INVERSE RELATION WHEREBY ONE OF SAID OPENINGS IS DECREASED IN SIZE WHILE THE OTHER IS INCREASED, THE OSCILLATING MOVEMENT OF THE VALVE MEMBER BEING INDUCED BY IMPULSES IMPARTED TO SAID VALVE MEMBER BY GASES FLOWING THROUGH THE VALVE AND RSTRICTED OPENINGS, AND SUPPLEMENTAL BIASING MEANS COUPLED TO AND ACTING UPON SAID VALVE MEMBER TO OPEN SAID VALVE OPENING.