行业新闻

原文
Butterfly valve for low temperature sealing performance requirements Valve body, valve stem bushing design requirements 1) low-temperature valve body structure and shape. The correct choice of materials or reliability of the normal valve has an extremely important work. Structural characteristics of butterfly valves and globe valves, gate valves, compared not only to avoid because of irregular shape, shell thickness uneven shrinkage at low temperatures generated, thermal stress caused by deformation, and because small butterfly , about the basic body shape is the known, and therefore heat capacity is small; for cold consumption is also small; regular shape and easy to measure the valve cold. Such as Shanghai Vivendi newly developed DD363H valve butterfly valve-type valve in order to ensure the reliable use of low temperature, low temperature valve in full accordance with the special nature of the design and manufacture, such as: shell material is selected with a cubic lattice of 1Cr18Ni9Ti austenitic stainless steel. 2) the choice of stem bushing. According to the user to reflect, among some low-temperature valve in operation, the rotating parts of the occurrence of sticky valve, bite have occurred, mainly due to: material selection matching unreasonable, the gap is too small to stay cold, and other reasons the precision cause.
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译文：

译文：
1)低温阀门壳体结构形状。材料选择的正确与否对阀门的正常可靠工作有着极其重要的意义。蝶阀的结构特点与截止阀、闸阀相比，不但避免了因形状不规则，壳体壁厚不均匀，在低温下产生的冷缩，温差应力所引起的变形，而且由于蝶阀体积小，阀体形状左右基本是的称的，因而热容量小；予冷量消耗也小；形状规则又便于对阀门的保冷措施。如上海维旺迪阀门新研制的DD363H型碟阀为保证阀门在低温下的可靠使用，完全按照低温阀的特殊性进行设计和制造，如：壳体材料选择了具有立方晶格的 1Cr18Ni9Ti奥氏体不锈钢等。 2)阀杆衬套的选择。根据用户反映，有些低温阀门在运行当中，阀门的转动部位发生粘滞，咬合现象时有发生，主要原因是：配对材料选择不合理，予留冷间隙过小，以及加工精度等原因所致。

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