原文：
在阀门设计或使用经验中，升降式阀门填料多为石棉盘根或石墨填料或聚四氟V型填料，但是这几种填料都受到阀门启闭次数的限制，就是随着阀门启闭次数的增加，填料会磨损，间隙逐渐增大，到一定次数（据统计不会超过2000次）阀门便会从填料处产生泄露。泄露后便需要从新压紧填料压盖。这种方案适合阀门启闭次数不多的场合。 如果阀门的启闭次数频繁，（如一年启闭10-30万次），这无疑增加阀门的使用、维护成本。 有没有一种能够在阀门启闭100-200万次后，仍然能够密封的设计呢？答案是肯定的。 一种办法为，在填料下方增加一个垫圈，在垫圈下边加一个弹簧（弹簧的预紧力需要计算），当填料磨损后，由于弹簧的作用，便会重新压紧填料，使其密封。这种办法目前通过使用检验，只能达到启闭50-100万次不泄露，需要使用方在每年大修时，重新压紧填料压盖，只能减少平时的维护。 另外一种办法，就是选用液压、气动密封技术，改变原来的阀门设计思路，在填料处使用油缸密封滑环，增加0型密封圈（需要计算摩擦力、密封比压，才能确定滑环和0型密封圈的数量）。这种办法通过使用，能够达到启闭200万次不泄露，但是0型密封圈要老化，使用时间只有5年，同时成本较高。

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译文：
Experience in valve design or use, the lift valve packing and more packing or graphite asbestos packing or PTFE V-type packing, but these types of fill valves open and close times are subject to the restrictions, that is, with the valve increase in the number of open and close, fill will wear, clearance gradually increased to a certain number of times (no more than 2000 times, according to statistics) the valvewill leak from the padding generated. Disclosure required after the new compression packing gland. This program is suitable valve opening and closing small number of occasions. If the number of frequent opening and closing valves, (such as opening and closing 10-30 million a year), it will increase the use of valves, maintenance costs. Is there a way to open and close the valves after the 100-200 million, still sealed design? The answer is yes. One approach is, below the increase in filling a washer, the washer below plus a spring (spring preload needed basis), when the packing wear and tear, due to the role of the spring, will be re-compression packing, sealing it. Currently testing this approach by using only 50-100 million to open and close not to disclose, need to use the side in the annual overhaul, re-compression packing gland, can reduce the normal maintenance. Another approach is to use hydraulic, pneumatic sealing technology, changes in the original valve design ideas, in the packing slip ring cylinder seal of office use, increased 0-ring (need to calculate the friction, seal pressure ratio, to determine the slip ring and 0-ring number). Using this approach, to achieve open and close two million times not to disclose, but the 0-ring to the aging, use of time only 5 years, while higher cost.