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原文
Shut-off valve selection High temperature, high pressure, high pressure, large diameter cut off is a relatively common problem, mainly due to the lack of pressure also has to allow large, cut off, high temperature expansion cards of the valve, such as high pressure steam regulation and cut off, due to large pressure (1 ~ 3MPa or larger), large diameter (DN200 ~ 300), had to use the balanced double seal structure (such as two-seater or double seal valve sleeve valve), the special treatment, the leakage rate of 10-4 , and then improve on the difficult, and full-function ultra-light composite valve performance, and can be a better solution to this problem, the leakage rate of 10-6 to 10-7 or more.
原文来自：http://www.anquanfa.org

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译文：
高温、高压、大压差、大口径切断是一个比较普遍的难题，主要原因是缺少同时具有允许压差大、切断好、耐高温膨胀卡的阀，如高压蒸汽调节与切断，因压差大（1～3MPa或更大），口径大（DN200～300），不得不采用平衡式的双密封结构（如双座阀或双密封套筒阀），经特殊处理，泄漏率可达10－4，再提高就困难了，而全功能超轻型调节阀综合性能好，可较好的解决这一难题，泄漏率可达10－6～10－7以上。

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