蝶閥軟密封：
Butterfly valve soft seal:
密封副兩側為金屬材料，另一側為彈性非金屬材料，稱為“軟密封”。該密封性能好，但不耐高溫，易磨損，力學性能差。如：鋼橡膠、鋼四氟乙烯等。軟密封座采用具有一定強度、硬度和耐溫性的非金屬材料，密封性能好，可實現零泄漏，但壽命和溫度適應性較差。
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:
密封副的兩側為金屬材料或其他硬材料，稱為“硬密封”。該密封性能差，但耐高溫、耐磨、機械性能好。如：鋼、銅、鋼石墨、鋼合金鋼；（這里的鋼也可以是鑄鐵、鑄鋼、合金鋼或堆焊、噴涂合金）。
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).
蝶閥（蝶閥廠家）硬密封采用金屬制成，密封性能相對較差，盡管一些制造商聲稱可以實現零泄漏。軟密封不能滿足部分腐蝕性材料的工藝要求，硬密封可以解決！這兩種密封可以相互補充。就密封而言，軟密封相對較好，但現在硬密封的密封也可以滿足相應的要求！軟密封的優點是密封性能好，缺點是易老化、磨損、使用壽命短。硬密封使用壽命長，但密封性能比軟密封差。
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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