Pipes used in offshore engineering primarily include seabed OCTG pipes, long-distance seabed transport pipes, and internal connection pipes for offshore oil and gas fields (seabed gathering and transportation pipelines, risers, and working connection pipelines). These pipes are required to possess high strength, excellent toughness, and strong resistance to seawater corrosion.

A high-temperature electric valve operates as follows: the control system issues a command; the electric actuator is energized to activate the motor; the motor then employs a gear train to reduce speed and increase torque, thereby driving the valve stem and ball to rotate by 90° or less. This rotation alters the relative position between the ball's through-hole and the pipeline, enabling the valve to open, close, or modulate its flow capacity.