蝶阀软密封：
Butterfly valve soft seal:
密封副两侧为金属材料，另一侧为弹性非金属材料，称为“软密封”。该密封性能好，但不耐高温，易磨损，力学性能差。如：钢橡胶、钢四氟乙烯等。软密封座采用具有一定强度、硬度和耐温性的非金属材料，密封性能好，可实现零泄漏，但寿命和温度适应性较差。
Both sides of the sealing pair are metal materials and the other side is elastic non-metallic materials, which is called "soft seal". The sealing performance is good, but it is not resistant to high temperature, easy to wear and poor mechanical properties. Such as: steel rubber, steel tetrafluoroethylene, etc. The soft seal seat adopts non-metallic materials with certain strength, hardness and temperature resistance. It has good sealing performance and can achieve zero leakage, but its service life and temperature adaptability are poor.
硬密封：
Hard seal:
密封副的两侧为金属材料或其他硬材料，称为“硬密封”。该密封性能差，但耐高温、耐磨、机械性能好。如：钢、铜、钢石墨、钢合金钢；（这里的钢也可以是铸铁、铸钢、合金钢或堆焊、喷涂合金）。
Both sides of the sealing pair are made of metal materials or other hard materials, which is called "hard seal". The sealing performance is poor, but it has high temperature resistance, wear resistance and good mechanical properties. Such as: steel, copper, steel graphite, steel alloy steel; (the steel here can also be cast iron, cast steel, alloy steel or surfacing and spraying alloy).
蝶阀（蝶阀厂家）硬密封采用金属制成，密封性能相对较差，尽管一些制造商声称可以实现零泄漏。软密封不能满足部分腐蚀性材料的工艺要求，硬密封可以！这两种密封可以相互补充。就密封而言，软密封相对较好，但现在硬密封的密封也可以满足相应的要求！软密封的优点是密封性能好，缺点是易老化、磨损、使用寿命短。硬密封使用寿命长，但密封性能比软密封差。
The hard seal of butterfly valve (butterfly valve manufacturer) is made of metal, and the sealing performance is relatively poor, although some manufacturers claim that zero leakage can be achieved. The soft seal can not meet the process requirements of some corrosive materials, and the hard seal can be solved! These two seals can complement each other. In terms of sealing, soft sealing is relatively good, but now hard sealing can also meet the corresponding requirements! The advantages of soft seal are good sealing performance, while the disadvantages are easy aging, wear and short service life. The service life of hard seal is long, but the sealing performance is worse than that of soft seal.
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