Answer / ramit sharma

Control valves are 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 done by means
of electrical,hydraulic or pneumatic system.

Answer / anish

valve is a device used to either control the flow rate or
to fully shutdown flow a control valve is automatically
controled either pneumatically or current(solenoid valve)

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