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原文
The choice of cut-off valve sealing surface (1) face to face seal: Common piston valve, the sealing surface of the small cone is 60 ℃, 60 ℃ seat is a small cone, the cone width is usually small in 0.5mm ~ 2mm between the seal must be guaranteed to be two a cone good contact. But in fact, it is always affected by processing errors (like heart degrees, roundness, slant, etc.), the sealing effect is not very satisfactory. Usually this type of valve leakage rate of 10-4, after precision grinding up to 10-6, only to achieve a better seal level. (2) spherical sealing: Using the spherical valve seat rotation and fixed a small cone tangent, as the line of contact between them, which compared the effect of a good face seal. Waring's of full-featured ultra-light valve, butterfly valve, etc. is to use spherical sealing the idea to produce, the leakage rate of 10-6 to 10-8, high-performance butterfly valve can be as high as 10-8 , as well as zero leakage.
原文来自：http://www.chinadiancifa.org

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译文：
（1）面对面密封：常见的柱塞阀芯，其密封面为60℃的小锥面，阀座也是60℃的小锥面，此小锥面的宽度通常在0.5mm～2mm之间，要密封好就必须保证两个锥面良好接触。但事实上，它始终受到加工误差的影响（如同心度、不圆度、倾斜度等），其密封效果不十分理想。这类阀的泄漏率通常为 10－4，经过精密的研磨可达10－6，只能达到较好的密封等级。（2）球面密封：利用阀芯的球面转动与固定的阀座小锥面相切，它们之间为线接触，这就比上述面对面密封的效果好。华林公司推出的全功能超轻型阀、球面密封蝶阀等就是采用这一思路来制作的，其泄漏率可达10－6～10－8，高性能的三偏心蝶阀可高达10－8，以至零泄漏。

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