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Analysis of Operating Modes and Selection of Regulating Valves for Power Plants
2019-02-19
1. Overview Control valves are widely used in thermal power plant piping systems to regulate the flow and pressure of process media. These valves operate under high-pressure and high-temperature conditions, and their control is typically managed via a DCS system during operation. When operating under varying conditions, it is crucial for each system to maintain high stability and coordination. Therefore, analyzing the operational modes and their effects, along with considering the flow characteristics and process parameters, is essential for providing valuable guidance in selecting the appropriate control valves for power plant applications. 2. Control Principle In a pipeline, a control valve functions as a throttling element with variable resistance. As the medium flows through the valve, it must overcome this resistance, resulting in energy consumption and causing losses in fluid velocity and pressure head. Ultimately, this mechanism enables precise control over both the flow rate and pressure of the fluid being regulated.
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