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Answer Posted / srinivasansureshkumar
Control valve: Also called as final control element /
variable orifice (Restrictor) in a flow line.
Principle of operation : Motion Balance Principle.
Breif Description: The control valve consists of
1. Actuator (Provides power to drive the valve otion)
2. Range spring (Its the one dictates the operating range
of valve)
3. yoke (Supports the Actuator to valve boby)
4. Valve Body (where plug & Seat in there throttles the
flow according to the position between them)
** The signal provided to the actuator drives the actuator
stem which is coupled to the plug stem. this motion occurs
opposing the range spring until the resultant force
generated by the actuator and range spring nullifies.
The resultant is the travel position of the valve.
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