Marine tanker fluid cargo control

Claim 1

A MARINE TANKER FLUID CARGO CONTROL SYSTEM COMPRISING A MAIN FLUID CARGO LINE; A MAIN VALVE FOR CONTROLLING THE SUPPLY OF FLUID IN SAID LINE; A HYDRAULIC MOTOR; MECHANICAL CLUTCH MEANS CONNECTING SAID MAIN VALVE AND SAID HYDRAULIC MOTOR AND HAVING TWO EXTREME POSITIONS CORRESPONDING TO THE FULL OPEN POSITION AND TO THE FULL CLOSED POSITION OF THE MAIN VALVE, CONSTITUTING THE EXTREME POSITION OF SAID VALVE; SAID CLUTCH MEANS INCLUDING A DRIVING ELEMENT POSITIVELY CONNECTED TO SAID MOTOR AND A DRIVEN ELEMENT POSITIVELY CONNECTED TO SAID VALVE, JAWS ASSOCIATED, RESPECTIVELY, WITH SAID DRIVING AND DRIVEN ELEMENTS AND MOVABLE INTO OR OUT OF ENGAGEMENT WITH EACH OTHER UPON OPERATION OF SAID MOTOR TOWARD AND FROM ITS EXTREME POSITIONS; MECHANICAL LATCH MEANS FOR FIRMLY LATCHING SAID MAIN VALVE IN ONE OF ITS EXTREME POSITIONS, AND MECHANICAL LATCH OPERATIONS MEANS ACTUATED BY INITIAL MOTION OF SAID DRIVING ELEMENT FROM ONE OF ITS EXTREME POSITIONS TOWARD THE OTHER EXTREME POSITION TO RELEASE SAID LATCH MEANS PRIOR TO ENGAGEMENT OF SAID JAW MEANS ON CONTINUED MOTION OF SAID CLUTCH MEANS TOWARD SAID OTHER EXTREME POSITION TO ACTUATE SAID MAIN VALVE; A PRESSURE FLUID LINE, AND A MANUAL CONTROL VALVE OPERABLE TO CONNECT SAID PRESSURE LINE TO SAID HYDRAULIC MOTOR.