Modulating Control Valve
Many process control valves are quarter-turn on/off valves that rotate 90 degrees from on to off. These are also referred to as stop valves or isolation valves. They are either completely open (90°) or completely closed (0°).
A modulating control valve, however, has the ability to be accurately positioned at any point between 0° and 90° as well. This adds the ability to control the amount of flow in addition to whether there is flow or not.
Quarter-turn valves include ball valves, butterfly valves, and plug valves. All of these can be made into modulating control valves by adding an actuator with modulating capabilities. These actuators can be either electric or pneumatic.
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