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,xxx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xxx也不好。 实践证明,提高阀杆锥面硬度是提高截止阀上密封寿命的可行办法。

“ Improve the life of cut-off valve on several common methods of sealing ”是由提供的国际阀门新闻，译文仅供参考。另外，中国截止阀网还提供相关产品搜索：、、、、等。

原文：
Valve structure is simple, both to spin around and through the valve stem down the principle, to the valve open or shut off and the valve seal and the sealing function. Since the special structure of the movement principle, also caused the seal of the valve between the force, Vice extremely negative consequences (to be formed between both the vertical Sealing pressure, there seal pair of friction between the slip). Practice shows that valves open and close the seal is often only a few times because Sealing leakage caused by abrasion between. Need to open the repair of minor scratches, abrasions serious damage were scrapped because of such consequences will not only increase the manufacturing costs of enterprises, but also affect the performance of the valve. To address these issues on the seal on the valve structure and materials was tested and improved. ① sealing position on the valve stem moves to the valve flap (aim is to force the process, the valve sealing surface on the flap on the relative valve sealing surface on the cover slip in a static state). Although this improvement can increase the seal life, but due to the increase of a valve flap valve cover and valve seal made between the more complicated structure, low cost. ② change on the sealing materials. Cone on the stem seal surfacing Scratch Properties of good stellite alloy, although this method has achieved good results, but on the one hand because of stellite alloy cost is too high, on the other hand because the stem basic material for the 13Cr stainless steel, weldability is poor, to be preheated before welding, after welding, insulation and welding complex. In addition, the size of the stem to ensure accuracy, also increase the roughing process. Comprehensive analysis, in addition to special requirements, the cost of this program is not good. Practice shows that the hardness increase stem taper seals to improve the life of cut-off valve on the possible ways.