Single acting and double acting positioning valves
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For the single-acting and double-acting positioning valves, do one rely on the spring and the other on the cylinder to act as the actuator? Can you talk about angular stroke and linear stroke?
Action form: Divided according to the driving method of the actuator. Single-acting: The actuator uses a single-acting form that utilizes a spring. That is, one side of the cylinder diaphragm is air pressure, and the other side is spring, which is returned by the spring. Double acting: There is air pressure on both sides of the actuator cylinder, which operates through differential pressure.
Angular travel: Ball valves, butterfly valves...rotating ones! Straight stroke: The stop valve... moves up and down!