● As outlined by pneumatic valve actuator type: Single acting(spring return) sort or double performing kind Pneumatic Actuated Ball Valves are actuate manually or mechanically. Handbook actuation is much the most typical, and actuation is attained by rotary motion using a screw thread stem, quarter flip rotary, or toggle lever. https://landenbbzwr.activoblog.com/14278433/butterfly-valve-options