Device for measuring fluid pressure

Claim 1

A GAS PRESSURE BALANCING UNIT OF THE CHARACTER DESCRIBED, ADAPTED TO BE INTERPOSED BETWEEN A SOURCE OF UNKOWN HIGH PRESSURE AND A LOW PRESSURE GAGE, BY MEANS OF WHICH THE LOW PRESSURE GAGE CAN BE USED TO ACCURATELY MEASURE THE AMOUNT OF SAID HIGH PRESSURE INCLUDING FLUCTUATIONS THEREOF, SAID BALANCING UNIT INCLUDING: WALLS DEFINING ADJACENT HIGH AND LOW PRESSURE GAS CHAMBERS, SEPARATED ALONG A COMMON PLANE, AND ASSOCIATED CONDUIT AND COUPLING MEANS FOR ATTACHING RESPECTIVELY THE HIGH PRESSURE GAS CHAMBER TO SAID HIGH PRESSURE SOURCE AND THE LOW PRESSURE GAS CHAMBER TO SAID LOW PRESSURE GAGE, JUXTAPOSED AREAS OF THE HIGH AND LOW PRESSURE GAS CHAMBERS ALONG SAID COMMON PLANE BEING FORMED WITH A PREDETERMINED RATION WHICH CONSTITUTES THE BALANCING RATIO OF PRESSURES OF THE TWO CHAMBERS, A PAIR OF FLEXIBLE DIAPHRAGMS SPANNING SAID RESPECTIVE JUXTAPOSED AREAS AND LOCATED GENERALLY PARALLEL TO EACH OTHER ALONG SAID COMMON PLANE, EACH FORMING A WALL OF ONE OF SAID CHAMBERS, SAID DIAPHRAGMS BEING COUPLED TOGETHER FOR FLEXION IN UNISON, TWO-WAY VALVE MEANS FUNCTIONALLY ASSOCIATED WITH SAID DIAPHRAGMS AND CONNECTING SAID HIGH AND LOW PRESSURE CHAMBERS, SAID VALVE MEANS BEING OPERABLE RESPONSIVE TO MOVEMENT OF SAID DIAPHRAGMS CAUSED BY VARIATION OF PRESSURE IN EITHER ONE OF SAID CHAMBERS FROM SAID BALANCING PRESSURE RATIO, THE VALVE MEANS BEING ADPATED THEREUPON TO TRANSIENTLY VENT GAS FROM ONE CHAMBER TO THE OTHER IN A DIRECTION ADAPTED TO RESTORE SAID BALANCING PRESSURE RATION AND CONSEQUENTLY TO RESTORE SAID DIAPHRAGMS TO BALANCING POSITION AND THEREUPON CLOSE THE VALVE MEANS.