软密封：

Soft sealing:

密封副的两侧一侧是金属材料，另一侧是有弹性的非金属材料的被称为"软密封"。这种密封的密封性能较好，但不耐高温,易磨损,机械性较差。如：钢 橡胶；钢 四氟 聚乙烯等。软密封座采用具有一定强度、硬度和耐温性能的非金属材料制作，密封性能好，可以作到零泄漏，但寿命和对温度的适应性比较差。

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:

密封副的两侧均是金属材料或较硬的其它材料的被称为"硬密封"。这种密封的密封性能较差，但耐高温、抗磨损、机械性能好。如：钢 钢；钢 铜；钢 石墨；钢 合金钢；（这里的钢也可能是铸铁，铸钢，合金钢也可能是堆焊，喷涂的合金）。

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.】

硬密封采用金属制作，密封性能相对比较差，尽管有制造商宣称可以作到零泄漏。软密封对一部分有腐蚀性的物料是不能满足工艺要求的，硬密封可以解决！这两种密封可以相互补充的，就密封性而言软密封相对较好，但是现在硬密封的密封性也能够满足相应的要求！软密封的优点是密封性能好，缺点是容易老化、磨损、使用寿命短。硬密封使用寿命长，但是密封性相对比软密封差。

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.

其结构上的区别主要有以下几点：

The main structural differences are as follows:

结构上的区别：软密封蝶阀多为中线型硬密封多为单偏心、双偏心、三偏心蝶阀；

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

耐温：软密封用于常温环境。硬密封可用于低温、常温、高温等环境；

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;

压力：软密封低压-常压，硬密封还可以使用于中高压等工况；

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

密封性能：软密封和三偏心硬密封蝶阀密封性能比较好，三偏心蝶阀在高压高温环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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