Control valves are valves used to control conditions such as flow,
pressure, temperature, and liquid level by fully or partially opening or
closing in response to signals received from controllers that compare a "setpoint" to a
"process variable" whose value is provided by sensors that monitor changes in such conditions.
The opening or closing of control valves is usually done automatically by electrical, hydraulic
or pneumatic actuators. Positioners are used to control the opening or closing of the
actuator based on electric, or pneumatic signals.
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