The control valve consists of two main assemblies: valve body assembly and actuator assembly (or actuator system), which are divided into four series: single-seat series control valve, double-seat series control valve, sleeve series control valve, And self-operated series control valve. Variations of the four types of valves can lead to many different applicable configurations, each with specific applications, features, advantages, and disadvantages. While some control valves are used in a wider range of applications than others, control valves are not suitable for all applications to work together to create the best solution for enhanced performance and reduced cost.
There are many types of valve bodies for control valves. Commonly used are straight-through single-seat, straight-through double-seat, angle, diaphragm, small flow, tee, eccentric rotation, butterfly, sleeve, spherical, etc. When making specific choices, consider the following:
1. It is mainly considered according to the selected flow characteristics and unbalanced forces.
2. When the fluid medium is a suspension containing a high concentration of abrasive particles, the internal material of the valve should be hard.
3. Since the medium is corrosive, try to choose a valve with a simple structure.
4. When the temperature and pressure of the medium are high and the change is large, the valve core and valve seat material should be selected with small changes in temperature and pressure.
5. Flash evaporation and cavitation only occur in liquid media. In the actual production process, flash evaporation and cavitation will form vibration and noise, shorten the service life of the valve, so the valve should be prevented from flashing and cavitation when selecting the valve.
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