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When pressure drops ratio (x=ΔP/P1) reaches some values close to 0.5 there will be sonic conditions with the associated vibration and noise, in gas or steam applications. In liquid service, when downstream pressure approaches vapour pressure at fluid temperature, cavitation will appear, with noise increase and damage to the valve components. This will happen whenever the cavitation index xF=(P1-P2)/ ΔP reaches the valve FL2 value. Our approach to both problems, either gases (sonic conditions) or liquids (cavitation), is based on the “source treatment”principle: this is to suppress the source of the problem, which is the high pressure drop. With our multicylinder cage the fluid goes through a stepped pressure reduction process, the number of steps being as large as necessary to keep pressure drop under critical values. We have the technology to calculate, design and manufacture the valve internals best suited for every set of conditions. We calculate, for every particular application, -the number of steps necessary to avoid critical conditions at any stage, -the partial pressure drops at every stage, -the Cv value of every cylinder to achieve a non critical pressure profile. This is equivalent to say that xT and Fl values of every valve will be as high as required by the given conditions. In small Cv, small size valves, the same results are obtained by our Multistep design. 閥門介紹，要求翻譯準(zhǔn)確點(diǎn)。 |
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【答案】應(yīng)助回帖
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言論壓力: 金幣+100, 翻譯EPI+1, ★★★★★最佳答案, 非常感謝 2013-10-25 14:58:09
言論壓力: 金幣+100, 翻譯EPI+1, ★★★★★最佳答案, 非常感謝 2013-10-25 14:58:09
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當(dāng)壓力下降率（ x = ΔP/P1）達(dá)到接近0.5的某個(gè)值時(shí) ，氣體或蒸汽應(yīng)用中會有與振動(dòng)和噪音相關(guān)的聲波條件。在液體中，當(dāng)下游壓力接近流體溫度的蒸氣壓時(shí)，會出現(xiàn)氣穴現(xiàn)象，并伴有噪聲的增加和閥門組件的損壞。當(dāng)xF的氣蝕指數(shù)= （P1-P2 ） / ΔP達(dá)到閥FL2的值時(shí)將發(fā)生這種情況。 無論是氣體（音速條件）或液體（氣蝕） ，我們解決兩個(gè)問題的方法是基于“源治療”的原則：即抑制問題的源頭——壓力降。 多筒穴中流體經(jīng)過臺階減壓過程，臺階數(shù)需要足夠大以保持臨界值下的壓力降。 我們有方法來計(jì)算，設(shè)計(jì)和制造閥門內(nèi)部以適合每一個(gè)條件。我們?yōu)槊恳粋�(gè)特定的應(yīng)用計(jì)算 臺階的必需數(shù)量以避免危急的情況 在任何階段的分壓下降 每個(gè)筒的Cv值以·實(shí)現(xiàn)非關(guān)鍵壓力分布。 這等于說XT的值和Fl值的每一個(gè)閥都與給定條件所要求的一樣高。在小CV，小口徑閥門的條件下，我們的多步設(shè)計(jì)得到了相同的結(jié)果。 |
2樓2013-10-17 17:03:44
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