• Introduction to Control Valve.
  • Introduction to Positioner.
  • Introduction to Control Loop.
  • Positioner Design and Applications.
  • Calibration Techniques.
  • Condition Monitoring / Preventative Maintenance.
  • Trouble Shooting of Positioners.
  • Latest Development in Positioners.
  • Conclusion.

An introduction to control valve

A control valve is used in the oil and gas industry to regulate the flow rate of the fluid in a pipeline or process (and the related process parameters as pressure, temperature, and level) according to signals managed by a controller. The role of a flow control valve in the complex petrochemical process is key, as the multiple loops involved in the process should be kept under strict and dynamic control to make sure that the process, as a whole, works as intended and produces the desired output in terms of quantity, quality and time.

The application of flow control valves is increasing in the last years, due to growing process automation in most industries.
These type of valves are used in irrigation systems, water treatment plants, oil and gas plants, power generation, fire prevention systems, food processing industries by streamlining the response to changes in processes and providing greater safety to personnel and equipment.
A flow control valve used in the oil and gas industry can have a globe, butterfly, or ball shape, and is available in multiple material grades and sizes. The most used type of actuator is the air-operated, as it involves less ancillary equipment (as cabling, switchgear) when compared to other types of actuators.
The opening and closing of the valve and its regulation are done by the combined effect of an electronic controller, a positioner and the actuator of the valve (which can be electric, pneumatic or hydraulic).
The actuator opens and closes the control valve in response to changes in key process parameters, such as changes in pressure, level, temperature, and flow.
By such action, the process parameters are maintained within the required target range to make sure the process, as a whole, works as intended and produces an end product in the desired quantity and quality.

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