Hydraulic control system for liquefied

Claim 1

A LIQUEFIED GAS STORAGE AND DISPENSING SYSTEM COMPRISING, IN COMBINATION, A PLURALITY OF TANKS, A SEPARATE LIQUID INLET AND OUTLET LINE IN COMMUNICATION WITH EACH TANK, A MOTOR VALVE IN EACH LINE CONTROLLING THE FLOW OF LIQUEFIED GAS TO AND FROM EACH RESPECTIVE TANK, A PRESSURE LIQUID CONDUIT, MEANS TO SUPPLY PRESSURE LIQUID IN SAID CONDUIT, THE MOTOR OF EACH MOTOR VALVE BIASING ITS VALVE IN A NORMALLY CLOSED POSITION, A SEPARATE CONDUIT CONNECTING THE MOTOR OF EACH MOTOR VALVE TO SAID PRESSURE LIQUID CONDUIT, A SEPARATE VALVE IN EACH OF THE SEPARATE CONDUITS FOR SELECTIVELY TRANSMITTING PRESSURE LIQUID FROM SAID PRESSURE LIQUID TO THE RESPECTIVE MOTORS TO OPEN SAID MOTOR VALVES AND FOR SELECTIVELY RELIEVING PRESSURE LIQUID FROM SAID RESPECTIVE MOTORS TO CLOSE SAID MOTOR VALVES, A VALVE MEANS IN COMMUNICATION WITH SAID PRESSURE LIQUID CONDUIT FOR RELIEVING ALL TANK VALVE MOTORS OF SAID PRESSURE LIQUID SIMULTANEOUSLY, SAID MEANS TO SUPPLY PRESSURE LIQUID IN SAID CONDUIT COMPRISES A PUMP ADAPTED TO IMPART PRESSURE TO LIQUID BEING PUMPED, A PRESSURE LIQUID SURGE TANK IN COMMUNICATION WITH THE DISCHARGE OF SAID PUMP, SAID PRESSURE LIQUID CONDUIT COMMUNICATING WITH SAID PRESSURE LIQUID SURGE TANK, A FIRST PRESSURE RESPONSE CONTROL MEANS COMMUNICATING WITH SAID PRESSURE LIQUID RANGE TANK AND BEING ADAPTED TO MAINTAIN THE PRESSURE WITHIN SAID SURGE TANK BETWEEN PREDETERMINED UPPER AND LOWER LIMITS, AND A SECOND PRESSURE RESPONSIVE CONTROL MEANS COMMUNICATING WITH SAID PRESSURE LIQUID SURGE TANK AND BEING ADAPTED TO SHUT OFF SAID PUMP WHEN THE PRESSURE OF THE LIQUID IN SAID SURGE TANK DECREASES TO A PREDETERMINED PRESSURE BELOW THE AFOREMENTIONED LOWER LIMIT TO BIAS SAID MOTOR VALVE CLOSED.