Index
- Introduction to Control Valves
- Control Valves photographs
- Control Valves - Classification
- Detailed Operation
- Installation Guidelines
- Control Valve Specifications in Details
- Applications
- Terminology
Why and What is a Control Valve ?
- Process Plants consist of hundreds, or networked together to produce a product to be offered for sale.
- Each of these control loops i designed to keep some important process variable such as pressure, flow, level, temperature, etc. within a required operating range to ensure the quality of the end product.
- Each of these loops receives and internally creates disturbances that detrimentally affect the process.
- Variable, and interaction from other loops in the network provides disturbances that influence the process variable.
- To reduce the effect of these load disturbances, sensors and transmitters collect information about the process variable and its relationship to some desired set point.
- A controller then processes this information and decides should be after a load disturbance occurs.
- When all the measuring, comparing, and calculating are done, some type of final control element must implement the strategy selected by the controller.
- 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 process to the desired set point.
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