Definition and use
Control valve is a kind of valve used to control the flow of fluid, which can precisely control the flow, pressure, temperature and other parameters of the fluid. Widely used in petroleum, chemical, electric power, metallurgy, pharmaceutical and other industries, for the need to accurately control the fluid parameters of the occasion.
Control valves are mainly used to adjust the flow, pressure, temperature and other parameters of the fluid to meet the needs of the process. Usually combined with automatic control system to realize the automatic adjustment of fluid parameters. Mainly used for the need to automatically adjust the fluid parameters of the occasion, such as heating systems, air conditioning systems.
the structure and composition
Control valve structure usually includes valve body, valve cover, valve spool, valve seat, actuator and other components. Valve spool and seat with the decision of the valve sealing performance and adjustment accuracy. Regulating valve structure is similar to the control valve, but usually has a more complex control system, such as electronic controllers, sensors, etc., in order to achieve more accurate regulation. Control valves are driven in a variety of ways, including pneumatic, electric, hydraulic, etc., to adapt to different application scenarios.
the working principle
The working principle of control valves is to control the flow of fluid by changing the opening between the spool and the valve seat. When the actuator receives the control signal, it will drive the valve stem to move, thus changing the position of the valve spool to realize the control of fluid flow.
The working principle of regulating valves is similar to that of control valves, but regulating valves are usually combined with automatic control systems. The fluid parameters are monitored in real time by sensors, and the signal is transmitted to the controller. The controller calculates the opening degree to be adjusted according to the signal, and drives the valve stem to move through the actuator to realize the automatic adjustment of fluid parameters.
the performance indicators and selection of performance indicators
Control valve performance indicators mainly include flow characteristics, pressure loss, sealing performance. Control valve performance indicators in addition to the performance indicators of the control valve, but also includes the regulation of precision, response speed and so on. Selection selection control valve, need to consider the nature of the fluid, operating pressure, operating temperature, flow range and other factors. Selection of control valves, in addition to consider the selection of control valves, but also need to consider the compatibility of the control system, regulation accuracy requirements.
Installation and maintenance
The installation of control valves need to consider the layout of the pipeline, the installation direction of the valve and other factors. The installation of control valves in addition to consider the installation of control valves, but also need to consider the wiring of the control system, the sensor installation location.
Maintenance of control valves need to regularly check the sealing performance of the valve, the working status of the actuator, etc.. Regulating valves need to check the working status of the control system in addition to the maintenance items of the control valve.