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.

正常情況下，高硬度材料可以更好地抵抗閃蒸和空化的破壞。高硬度材料通常用于制造閥體。例如，鉻鉬合金鋼閥經(jīng)常被用于電力行業(yè)，WC9是常見(jiàn)的耐腐蝕材料之一。如果角閥下游配備了高硬度的管道，則可以使用碳鋼材料作為閥體的下游部分，因?yàn)橹挥虚W蒸液體。閃蒸現(xiàn)象是由系統(tǒng)設(shè)計(jì)決定的。

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.

滬工閥門(mén)用于加熱排水閥將閃蒸水排入冷凝器.

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

閃蒸出現(xiàn)在調(diào)節(jié)閥和冷凝器之間的管道中，閃蒸破壞只會(huì)出現(xiàn)在這個(gè)區(qū)域。閃蒸現(xiàn)象發(fā)生在閥門(mén)的下游和冷凝器中。因此，冷凝器必須比管道具有更大的體積，以防止高速氣泡沖擊材料表面。因此，良好的系統(tǒng)設(shè)計(jì)有助于防止閃蒸破壞。

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.

使流動(dòng)介質(zhì)通過(guò)包含曲折路徑的節(jié)流部件是減輕壓力恢復(fù)的一種方法。雖然這種曲折路徑可以有不同的形式，比如小孔和放射流路。但是每個(gè)設(shè)計(jì)的效果基本相同。這種曲折路徑可以用于各種控制腐蝕的部件設(shè)計(jì)。滬工閥門(mén)多級(jí)減壓的每一級(jí)都消耗了一部分能量，使得下一級(jí)入口壓力相對(duì)較低，降低了下一級(jí)的壓差，降低了壓力，避免了汽蝕。一個(gè)成功的設(shè)計(jì)可以使閥門(mén)在收縮后的壓力高于液體的飽和壓力，同時(shí)承受較大的壓差，防止液體汽蝕。因此，對(duì)于相同的壓力降低，一級(jí)節(jié)流比多級(jí)節(jié)流更容易產(chǎn)生汽蝕

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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