A control valve, also known as an automatic control valve, is a throttling valve typically equipped with an actuator or actuation system, designed to operate within a control loop. It serves as the final control element in a process loop, which includes a sensing device, controller, and final control element.
Unlike manually operated valves and pressure regulators, which can function independently in throttling applications, a control valve requires integration within a control loop. This distinction underscores that while a control valve is a type of throttling valve, not all throttling valves function as control valves.
Generally, control valves are divided into four types: globe, butterfly, ball, and eccentric plug valves. Each design has specific applications, features, and advantages.
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