Control valves
（重定向自Automatic control valve）
![Globe valve with a manual hand-wheel](/Images/godic/202412/22/Carbon_steel_globe_valve3122.jpg")
![Globe control valve with pneumatic actuator and smart positioner](/Images/godic/202412/22/Pl_control_valve3122.jpg")
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. Control Valve is also termed as the Final Control Element.