Comparative analysis of three kinds of control valve cavitation damage diagnosis method, the Suggestions on the Industrial Valves type selection, make full use of the law, export control flow, avoid or reduce the damage of the valve. Control valve in the fluid industry plays a major role. Now, with equipment, energy saving and emission reduction to improve business efficiency, continuous and stable operation, reduce the control valve spare parts, quick after-sales service response requirements gradually increase, leading to more and more importance to how to optimize the problem, select and use control valve, this is because the control valve in the device plays the role of the executor, directly determine the running status of equipment, according to statistics, due to failure of the control valve device parking proportion is as high as 65%, the stand or fall of control valve selection also decided to produce the product quality and production. Review in recent five years, control valve technology is developing rapidly, some of the world's leading level control valve manufacturers to launch the application of the valve under special circumstances, such as poor resistance to high temperature and high pressure, cavitation, flashing, part of the particle medium abrasion, high noise conditions; Intelligent diagnosis model locator dogs at the same time, through the positioner valve can be good real-time detection and provide maintenance alarm information, optimization of the valve use. There is no doubt, the improvement of these techniques, which greatly ensure the stability of the equipment operation, reduce the many weak links. But how can we calculate correctly select and use the valve? By using the experience of that in harsh conditions, the cavitation damage valve internals, often accompanied by high noise, vibration, blocking the flow, and so on and so forth within, the calculate the valve type selection, how to reduce and avoid the occurrence of cavitation, the proper use of the valve is very important. At present, the valve manufacturer of cavitation different evaluation methods, this paper revolves around KE, delta and XFz method, mainly aimed at how to reduce and avoid cavitation and valve selection of correct application is analyzed. The control valve cavitation ( Cavitation) Control valve cavitation phenomenon refers to the medium flows through the shrinkage cavity in the valve flow area, the velocity, the pressure to a minimum, if at this time the pressure is lower than the medium saturated vapor pressure of liquid gasification, part into the steam or gas bubbles. When the medium flows through the shrinkage after flow, pressure, if more than saturated vapor pressure value, the bubble burst, again by air ( Steam) The phase into the liquid phase, this process is called cavitation and cavitation ( 空化) , as shown in figure 1. When the bubble burst, jet release enormous energy, and generate vibration wave, the laboratory prove 150 microns diameter droplets bubble burst the injection speed of 400 km/h, can amount to thousands of kilograms, instantaneous blasting pressure produced by the serious impact on the surface of a trim, erosion wear ( See figure 2) And at the same time can lead to severe vibration and high noise, block the flow. For the serious cavitation, in a very short period of time, trims will be damaged or work characteristics change of the Industrial Valves.
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