Cavitation cavitation generated in the control valve cavitation phenomenon, the fundamental reason is that the valve before and after the pressure is too high. It is generally considered that when Δp> 2.5MPa, the pressure of the fluid medium suddenly drops when it enters the throttling part inside the valve, and the pressure is reduced to a minimum at the minimum flow cross-sectional area. When the pressure is lower than the saturated vapor pressure of the fluid at the current temperature , Part of the liquid vaporization will occur, the formation of a large number of tiny bubbles, when the fluid flow through the throttle pressure rise, the bubble rupture back to the liquid, the valve body and valve components and other impact and bring noise, vibration Other hazards. In recent years, some domestic and foreign control valve manufacturers have developed a variety of different types of anti-cavitation multi-stage anti-cavitation valve specifically for use in harsh conditions. Common multi-stage pressure reducing valve is divided into cascade control valve, multi-layer sleeve valve, labyrinth control valve, although the structure is different, but have a common principle of work, are by changing the structure will be The total pressure of multi-stage step-down buck, so that each level of pressure drop Δp1 less than the critical pressure to produce cavitation, thus effectively avoiding the occurrence of cavitation and other hazards.
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