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原文
Shut-off valve sealing material selection (1) soft sealing In addition to corrosion-resistant lining of the valve, in general, the soft seal spool valve or valve seat means either non-metallic materials (mainly PTFE, and rubber) seal in the form of the valve. Soft sealing valve seal is best, but in the pipe installation, system cleaning that could have left more or less does not clean debris (such as welding slag, iron, etc.), which flows through the valve, it is easy to soft seal spool valve seat or scratch, so that leakage increased, the reliability is poor sealing. Therefore, the choice of soft seal structure must take into account the medium and put into operation before the strict clean flush pipe. (2) seal Seal surfacing wear-resistant alloy and then shut-off valve is the best choice. In considering the tightness of this approach taking into account the service life and reliability, although the factory index is only 10-6 to 10-8, less than zero leakage sealing effect of the soft, but enough to meet the strict requirements of cut off, and it durable, from an economic point of view more cost-effective.
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译文：
（1）软密封除耐腐蚀的衬里阀门外，一般的软密封阀指阀芯或阀座两者之一采用非金属材料（主要为聚四氟乙烯，还有橡胶等）的密封形式的阀。软密封阀密封效果最佳，但在管道安装、系统的清洗中都有可能留下或多或少不干净的杂物（如焊渣、铁屑等），它们流经调节阀时，容易把软密封阀座或阀芯划伤，使泄漏量增加，密封的可靠性差。所以，选择软密封结构必须考虑介质的清洁和投运前严格冲洗管道。（2）硬密封硬密封再堆焊耐磨合金等是切断阀的最佳选择。这种方式在考虑密封性的同时也考虑了使用寿命和可靠性，虽然出厂指标只有10－6～10－8，达不到软密封零泄漏的效果，但足以满足严密切断的要求，而且它经久耐用，从经济的角度考虑更合算。

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