Underwater control system

Claim 1

FOR COMBINATION WITH FLUID PRESSURE RESPONSIVE ACTUATOR APPARATUS AT A SUBMARINE WELL HEAD, FIRST MEANS TO DELIVER FLUID PRESSURE AT THE WELL HEAD LOCATION, ELECTRICALLY RESPONSIVE SECOND MEANS FOR CONTROLLING DELIVERY OF FLUID PRESSURE BETWEEN SAID FIRST MEANS AND APPARATUS, SAID SECOND MEANS INCLUDING ELECTRICAL PRIME MOVER MEANS AND ELECTRICAL PRIME MOVER OPERATED VALVING MOVABLE IN DIFFERENT MODES TO CONTROL SAID FLUID PRESSURE DELIVERY TO SAID APPARATUS, AND LOOP CIRCUIT MEANS INCLUDING SELECTIVELY ENERGIZABLE CONTROL SECTIONS REMOTE FROM SAID SECOND MEANS, MULTIPLE BRANCHES ELECTRICALLY CONNECTED WITH SAID SECOND MEANS REMOTELY FROM SAID SECTIONS RECTIFIER MEANS AND A SINGLE TRANSMISSION AND RETURN LINE ELECTRICALLY CONNECTED BETWEEN SAID SECTIONS AND BRANCHES FOR EFFECTING VALVING MOVEMENT IN ONE MODE IN RESPONSE TO CURRENT FLOW IN ONE DIRECTION THROUGH ONE OF SAID SECTIONS, SAID LINE AND ONE OF SAID BRANCHES, AND FOR EFFECTING VALVING MOVEMENT IN ANOTHER MODE IN RESPONSE TO CURRENT FLOW IN ANOTHER DIRECTION THROUGH ANOTHER OF SAID SECTIONS, SAID LINE AND ANOTHER OF SAID BRANCHES.