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Fisher Scientific
The most common final control element in the process control industries is the control valve. The control valve manipulates a flowing fluid, such as gas, steam, water, or chemical compounds, to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point. [1]
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Proportional control
Control valve - Wikipedia ... Control valve
Thermo Fisher Scientific
Electronic throttle control
Diaphragm valve - Wikipedia ... Diaphragm valve