軟密封：

Soft sealing:

密封副的兩側一側是金屬材料，另一側是有彈性的非金屬材料的被稱為"軟密封"。這種密封的密封性能較好，但不耐高溫,易磨損,機械性較差。如：鋼 橡膠；鋼 四氟 聚乙烯等。軟密封座采用具有一定強度、硬度和耐溫性能的非金屬材料制作，密封性能好，可以作到零泄漏，但壽命和對溫度的適應性比較差。

A soft seal is a type of sealing where one side of the sealing pair is made of metal material and the other side is made of elastic non-metallic material. This type of seal has good sealing performance, but is not resistant to high temperatures, is prone to wear, and has poor mechanical properties. For example: steel rubber; Steel, PTFE, etc. The soft sealing seat is made of non-metallic materials with certain strength, hardness, and temperature resistance. It has good sealing performance and can achieve zero leakage, but its lifespan and adaptability to temperature are relatively poor.

硬密封：

Hard sealing:

密封副的兩側均是金屬材料或較硬的其它材料的被稱為"硬密封"。這種密封的密封性能較差，但耐高溫、抗磨損、機械性能好。如：鋼 鋼；鋼 銅；鋼 石墨；鋼 合金鋼；（這里的鋼也可能是鑄鐵，鑄鋼，合金鋼也可能是堆焊，噴涂的合金）。

A hard seal is one in which both sides of the sealing pair are made of metal materials or harder materials. This type of seal has poor sealing performance, but it is resistant to high temperature, wear, and has good mechanical properties. For example: steel; Steel and copper; Steel graphite; Steel alloy steel; The steel here may also be cast iron, cast steel, alloy steel, or alloy steel that is welded or sprayed.】

硬密封采用金屬制作，密封性能相對比較差，盡管有制造商宣稱可以作到零泄漏。軟密封對一部分有腐蝕性的物料是不能滿足工藝要求的，硬密封可以解決！這兩種密封可以相互補充的，就密封性而言軟密封相對較好，但是現在硬密封的密封性也能夠滿足相應的要求！軟密封的優點是密封性能好，缺點是容易老化、磨損、使用壽命短。硬密封使用壽命長，但是密封性相對比軟密封差。

The hard seal is made of metal and has relatively poor sealing performance, although some manufacturers claim to achieve zero leakage. Soft sealing cannot meet the process requirements for some corrosive materials, while hard sealing can solve the problem! These two types of seals can complement each other. In terms of sealing performance, soft seals are relatively good, but now the sealing performance of hard seals can also meet the corresponding requirements! The advantages of soft sealing are good sealing performance, but the disadvantages are easy aging, wear, and short service life. Hard seals have a long service life, but their sealing performance is relatively worse than soft seals.

其結構上的區別主要有以下幾點：

The main structural differences are as follows:

結構上的區別：軟密封蝶閥多為中線型硬密封多為單偏心、雙偏心、三偏心蝶閥；

Structural differences: Soft sealed butterfly valves are mostly medium linear and hard sealed, with single eccentric, double eccentric, and triple eccentric butterfly valves;

耐溫：軟密封用于常溫環境。硬密封可用于低溫、常溫、高溫等環境；

Temperature resistance: Soft sealing is used in room temperature environments. Hard sealing can be used in environments such as low temperature, room temperature, and high temperature;

壓力：軟密封低壓-常壓，硬密封還可以使用于中高壓等工況；

Pressure: Soft seal low-pressure atmospheric pressure, hard seal can also be used in medium and high pressure working conditions;

密封性能：軟密封和三偏心硬密封蝶閥密封性能比較好，三偏心蝶閥在高壓高溫環境下可以保持良好的密封。

Sealing performance: Soft sealing and triple eccentric hard sealing butterfly valves have better sealing performance, and triple eccentric butterfly valves can maintain good sealing in high-pressure and high-temperature environments.

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