Servo-type pressure regulator

Claim 1

APPARATUS FOR PROVIDING PROPORTIONATE CONTROL OF REGULATING PRESSURE AT A PLURALITY OF PRE-SELECTED POINTS COMPRISING A SOURCE OF FLUID UNDER PRESSURE, A PRESSURE REGULATOR CONNECTED TO SAID SOURCE, FIRST MENAS FOR ADJUSTING THE PRESSURE AT THE OUTLET OF SAID REGULATOR, A CONDUIT CONNECTED TO SAID REGULATOR, A PRESSURE SENSITIVE INSTRUMENT CONNECTED TO SAID CONDUIT AND HAVING INDICTOR MEAND FOR INDICATING PRESSURE IN SAID CONDUIT, A SERVOMOTOR 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, AT LEAST THREE VOLTAGE DIVIDERS CONNECTED IN SERIES ACROSS SAID SOURCE, EACH SAID VOLTAGE DIVIDER BEING INDIVIDUALLY ADJUSTABLE IN RESISTANCE, AND WHEN ADJUSTED BEING FIXED IN RESISTANCE, AND SWITCH MEANS HAVING A PLURALITY OF CONTACTS CORRESPONDING IN NUMBER TO SAID DIVIDERS, AND EACH CONNECTED TO ONE OF SAID DIVIDERS, SAID SWITCH MEANS BEING SELECTIVELY ADJUSTABLE RELATIVE TO SAID PLURALITY OF CONTACTS TO CONNECT ANY DESIRED NUMBER OF SAID VOLTAGE DIVIDERS ACROSS SAID SOURCE WHEREBY THE VOLTAGE FROM SAID SOURCE MAY BE PROPORTIONALLY ADJUSTED TO ESTABLISH IN SAID CONDUIT A PLURALITY OF PRESELECTED PRESSURES, SAID PRESSURES BEING INDICATED ON SAID INDICATOR MEANS, SAID FIRST MEANS BEING ACTUATED BY SAID SERVO-MOTOR IN AN INFINITE NUMBER OF GRADUATIONS OF PRESSURE DEPENDENT UPON THE SETTING OF SAID SWITCH MEANS, THE PRESSURE IN SAID CONDUIT BEING REPRODUCIBLE AT ANY TIME TO CORRESPOND TO ANY PRIOR SETTING OF SAID SWITCH MEANS.