An offshore fluid transfer system comprising a boom (2100) and at least one movable fluid conveying pipe (3000) attached to the boom, said movable pipe (3000) comprising, starting from its anchorage point, a length for extension, then an outer valve (3210) for coupling to a third party loading pipe, a maneuvering cable called outer maneuvering cable (4100) maneuvered from the boom (2100) being furthermore linked to the free end of the movable pipe at a point referred to as cable anchorage point, characterized in that the anchorage point is rigidly connected to the outer valve (3210). The invention also relates to the corresponding method.