Flashing in the regulating valve is not preventable. What we can do is to prevent damage from flashing. The structure, material performance, and system design of Shanghai Industrial and Commercial Corporation valves are the main factors affecting flash damage in the design of regulating valves. For cavitation damage, a valve structure with a tortuous path, multi-level pressure reduction, and porous throttling can be used to prevent it. Although the valve structure is not related to flash evaporation, it can suppress the damage of flash evaporation. Compared to spherical valve bodies, the use of an angular valve body structure with medium flowing from top to bottom can prevent flash damage. Flash damage is caused by high-speed saturated bubbles impacting the valve body surface and corroding the valve body surface. Due to the direct flow of the medium in the angle valve to the center of the downstream pipeline inside the valve body, rather than directly impacting the body wall like a spherical valve, the destructive force of flash evaporation is greatly reduced.

正常情况下，高硬度材料可以更好地抵抗闪蒸和空化的破坏。高硬度材料通常用于制造阀体。例如，铬钼合金钢阀经常被用于电力行业，WC9是常见的耐腐蚀材料之一。如果角阀下游配备了高硬度的管道，则可以使用碳钢材料作为阀体的下游部分，因为只有闪蒸液体。闪蒸现象是由系统设计决定的。

Under normal circumstances, high hardness materials can better resist the damage of flash evaporation and cavitation. High hardness materials are commonly used for manufacturing valve bodies. For example, chromium molybdenum alloy steel valves are often used in the power industry, and WC9 is one of the common corrosion-resistant materials. If a high hardness pipeline is installed downstream of the angle valve, carbon steel material can be used as the downstream part of the valve body, as there is only flash liquid. The flashing phenomenon is determined by the system design.

沪工阀门用于加热排水阀将闪蒸水排入冷凝器.

The Shanghai engineering valve is used to heat the drainage valve and discharge the flash water into the condenser

闪蒸出现在调节阀和冷凝器之间的管道中，闪蒸破坏只会出现在这个区域。闪蒸现象发生在阀门的下游和冷凝器中。因此，冷凝器必须比管道具有更大的体积，以防止高速气泡冲击材料表面。因此，良好的系统设计有助于防止闪蒸破坏。

Flash evaporation occurs in the pipeline between the control valve and the condenser, and flash damage only occurs in this area. Flashing occurs downstream of the valve and in the condenser. Therefore, the condenser must have a larger volume than the pipeline to prevent high-speed bubbles from impacting the material surface. Therefore, a good system design helps to prevent flash damage.

使流动介质通过包含曲折路径的节流部件是减轻压力恢复的一种方法。虽然这种曲折路径可以有不同的形式，比如小孔和放射流路。但是每个设计的效果基本相同。这种曲折路径可以用于各种控制腐蚀的部件设计。沪工阀门多级减压的每一级都消耗了一部分能量，使得下一级入口压力相对较低，降低了下一级的压差，降低了压力，避免了汽蚀。一个成功的设计可以使阀门在收缩后的压力高于液体的饱和压力，同时承受较大的压差，防止液体汽蚀。因此，对于相同的压力降低，一级节流比多级节流更容易产生汽蚀

One method of reducing pressure recovery is to pass the flowing medium through a throttling component containing a tortuous path. Although this tortuous path can take different forms, such as small holes and radial flow paths. But the effect of each design is basically the same. This tortuous path can be used for the design of various components that control corrosion. Each stage of the multi-stage pressure reduction of the Shanghai Engineering valve consumes a portion of energy, resulting in a relatively low inlet pressure of the next stage, reducing the pressure difference of the next stage, reducing pressure, and avoiding cavitation. A successful design can ensure that the pressure of the valve after contraction is higher than the saturation pressure of the liquid, while withstanding a large pressure difference to prevent liquid cavitation. Therefore, for the same pressure reduction, primary throttling is more prone to cavitation than multi-stage throttling

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