Servo-type pressure regulator

Claim 1

APPARATUS FOR REGULATING PRESSURE AT A PLURALITY OF PRE-SELECTED POINTS COMPRISING A SOURCE OF FLUID UNDER PRESSURE, A PRESSURE REGULATOR CONNECTED TO SAID SOURCE, FIRST MEANS FOR ADJUSTING THE PRESSURE AT THE OUTLET OF SAID REGULATOR, SAID FIRST MEANS COMPRISING AN ARMATURE, SECOND MEANS FOR VARYING THE POSITION OF SAID ARMATURE IN PRE-SELECTED INCREMENTS, SAID SECOND MEANS COMPRISING A PLURALITY OF GAUGE BLOCKS, A DIFFERENTIAL TRANSFORMER HAVING A HOLLOW CORE TO RECIEVE SAID ARMATURE, AND MEANS DRIVEN BY A SERVO MOTOR TO MOVE THE POSITION OF SAID TRANSFORMER TO CENTER SAID TRANSFORMER ELECTRICALLY RELATIVE TO SAID ARMATURE, A CONDUIT CONNECTED TO SAID REGULATOR, A PRESSURE SENSITIVE INSTRUMENTS CONNECTED TO SAID CONDUIT AND HAVING INDICATOR MEANS FOR INDICATING PRESSURE IN SAID CONDUIT, A SERVO-MOTOR ARRANGED TO ACTUATE SAID FIRST MEANS, AND AN ELECTRICAL CIRCUIT ARRANGED TO ENERGIZE SAID SERVO-MOTOR, SAID ELECTRICAL CIRCUIT COMPRISING A SOURCE OF SIGNAL VOLTAGE AND ADJUSTABLE MEANS FOR DIVIDING BOLTAGE FROM SAID SOURCE, WHEREBY BY ADJUSTMENT OF SAID ADJUSTABLE MEANS SAID PRESSURE REGULATOR MAY BE ADJUSTED TO ESTABLISH IN SAID CONDUIT A PLURALITY OF PRE-SELECTED PRESSURES, SAID PRESSURES BEING INDICATED ON SAID INDICATOR MEANS.