Selection and principles of control valves
Selection and principles of control valves
The importance of selecting control valves is that control valves are one of the main actuators in self-control systems, and their application quality is directly reflected in the system's regulation quality. As a terminal component in process control, people have a renewed understanding of its importance compared to the past. The quality of the application of control valves depends not only on the quality of the control valve product itself and whether the user has installed, used, and maintained it correctly, but also on the correct calculation and selection. Due to errors in calculation and selection, the system may start and stop, and some may even be unable to be put into use. Therefore, users and system designers should recognize the importance of valves on site and pay sufficient attention to the selection of control valves.The main control valve product names of China Control Valve Network include:Air filter reducerAngle seat control valve,Angle stroke electric actuator,Angle stroke electronic electric actuator,Anti cavitation corrosion depressurization technology regulator,Centerline sealing rubber butterfly valve,CV3000-DHCB electric cage control valve,CV3000-DHSC Explosion-proof electric cage single-seat regulatorCV3000-HCB cage control valves
The basic principles for selecting control valves are: 1) Choose the appropriate structural form and material according to the process conditions; 2) Select the flow characteristics of the control valve based on the characteristics of the process object; 3) Select the appropriate control valve diameter size based on the process operating parameters; 4) Select the required auxiliary devices according to the requirements of the process; 5) Reasonably choose the executing agency. The response speed of the executing mechanism should be able to meet the requirements of the process control valve;
Requirement for control travel time: The selected control valve actuator should be able to meet the requirements of valve travel and process leakage level. In some situations, such as selecting pressure control valves (including vent valves), the actual possible pressure difference should be considered for appropriate amplification, which requires the actuator to provide a larger force. Otherwise, there may be a danger that the actual pressure difference before and after the control valve may be large when abnormal situations occur in the process, and it may not be able to close or open.
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2024-09-29
