行业新闻

原文
Valve on the seal structure and materials to improve test Valve structure is simple, can stem both the principle of rotation and lift, to the valve open or cut, and ensure that the valve seal and the sealing function. Because of the special structure of the movement principle, also result in the valve sealing force between the extremely negative consequences (to be formed between both the vertical sealing pressure, sealing another relative slip between the friction). Practice has proved that the valve seals are often only open and close on a few times because of sealing between the abrasion caused by leakage. The need to open repair minor scratches, abrasions and severe damage were scrapped because of such consequences will not only increase the company's manufacturing costs, but also affect the performance of the valve. To solve such problems on the sealing of the valve structure and the material was tested and improved. ① parts of the seal on the valve stem moves to the valve flap (aim is to force the process, so that the valve on the valve cover sealing surface relative to a stationary sealing surface on the no-slip condition). This improvement may well enhance the life of the seal, but due to the increase in a valve cover and the seal between the valve makes the structure more complex, lower cost. ② change on the sealing materials. Cone in the stem seal surfacing on a good anti-abrasion performance of Stellite alloy, this method has yielded good results, but on the one hand because of stellite alloy cost is too high, partly because the stem basic material for the 13Cr martensitic stainless steel, weldability is poor, surfacing to be preheated before welding, after welding heat and weld complex process. In addition, to ensure the dimensional accuracy of the stem, but also increase the roughing process. Comprehensive analysis, in addition to special requirements, the cost of this program is not good.
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是由上海一环流体控制设备有限公司提供的阀门新闻，中文译文仅供参考，以下提供站内导航搜索：

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译文：
截止阀结构简单,可通过阀杆既旋转又升降的原理,达到阀门的开启或截断,并确保阀门的密封和上密封功能。由于该结构特殊的运动原理,也造成对阀门上密封副间受力极为不利的后果(形成既有密封副间必须的垂直压力,又有密封副间相对滑移的摩擦)。实践证明,阀门的上密封往往只启闭几次,就因为密封副间的擦伤而引起泄漏。擦伤轻微的需拆开修复,擦伤严重的均因损坏而报废,这样的后果不但增加了企业的制造成本,而且影响阀门的性能。为解决此类问题对阀门上密封的结构和材料做了试验和改进。　　①将阀杆的上密封部位移动到阀瓣上(目的是在受力过程中,使阀瓣上的上密封面相对阀盖上的上密封面处于静止无滑移状态)。此改进虽然可提高上密封的寿命,但由于要增加一道阀瓣盖与阀瓣间的密封使得结构较复杂,性价比较低。　　②改变上密封副材料。在阀杆密封锥面上堆焊抗擦伤性能好的司太立硬质合金,此方法虽然取得了较好的效果,但一方面因为司太立合金成本太高,另一方面由于阀杆基本材料为13Cr马氏体不锈钢,可焊性差,堆焊时须焊前预热,焊后保温和焊接工艺复杂。另外,为保证阀杆的尺寸精度,还要增加粗加工工序。综合分析,除特殊要求外,此方案其性价比也不好。

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