软密封闸阀和硬密封闸阀是闸阀系列的两大类。硬密封和软密封有时可以相互弥补，有时独立。软密封闸阀和硬密封闸阀有什么关系？主要区别是什么？接下来，良工阀门厂家小编将为您解开这些谜团。

Soft sealed gate valves and hard sealed gate valves are two major categories of gate valve series. Hard sealing and soft sealing can sometimes complement each other, and sometimes they are independent. What is the relationship between soft sealed gate valves and hard sealed gate valves? What are the main differences? Next, the editor of Lianggong Valve Manufacturer will unravel these mysteries for you.

密封材料

sealing material 

软密封闸阀:密封副的一侧是金属材料，另一侧是弹性非金属材料，称为“软密封”。这种密封性能好，但不耐高温，易磨损，机械性能差。

Soft seal gate valve: One side of the sealing pair is made of metal material, and the other side is made of elastic non-metallic material, which is called a "soft seal". This type of sealing performance is good, but it is not resistant to high temperatures, is prone to wear, and has poor mechanical performance.

硬密封闸阀：密封副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。

Hard sealed gate valve: The two sides of the sealing pair are made of metal or other hard materials, which is called a "hard seal". The sealing performance is poor, but it has good high-temperature and wear-resistant mechanical properties.

结构机理

Structural mechanism

硬密封闸阀是金属和金属之间的密封，密封球和阀座是金属的。加工精度和工艺难度大，一般用于高压，通常超过35MPa。软密封闸阀是金属和非金属之间的密封，如尼龙四氟乙烯，制造标准相同。

A hard sealed gate valve is a seal between metals, with the sealing ball and seat made of metal. The machining accuracy and process difficulty are high, generally used for high pressure, usually exceeding 35MPa. Soft sealed gate valves are seals between metal and non-metal materials, such as nylon tetrafluoroethylene, manufactured to the same standard.

设备选型

Equipment Selection 

软硬密封闸阀的选择主要基于工艺介质温度和压力。一般介质中含有固体颗粒或磨损或温度高于200度。如果直径大于50，阀门压差大，也应考虑开启阀门的扭矩大小。扭矩大时应选用固定硬密封球阀，软硬密封的密封等级可达6级。

The selection of soft and hard sealed gate valves is mainly based on the temperature and pressure of the process medium. Generally, the medium contains solid particles or is worn or has a temperature higher than 200 degrees. If the diameter is greater than 50 and the valve pressure difference is large, the torque required to open the valve should also be considered. When the torque is high, fixed hard sealed ball valves should be selected, and the sealing level of soft and hard seals can reach level 6.

使用条件

Usage conditions

软密封闸阀一般密封能达到很高的水平，硬密封应根据要求高或低；软密封需要防火，因为在高温下，软密封材料会泄漏，硬密封没有这个问题；硬密封一般可以做高压，软密封不好；软密封由于介质问题，有些场合不能使用，后硬密封阀一般比软密封贵。至于制造，两者差别不大，主要是阀座的区别，软密封是非金属的，硬密封是金属的

Soft sealed gate valves generally achieve a high level of sealing, while hard seals should be high or low according to requirements; Soft sealing needs to be fireproof because at high temperatures, the soft sealing material will leak, while hard sealing does not have this problem; Hard sealing can generally be used for high pressure, while soft sealing is not good; Soft seals cannot be used in some situations due to medium issues, and hard sealed valves are generally more expensive than soft seals. As for manufacturing, there is not much difference between the two, mainly due to the difference in valve seats. Soft seals are non-metallic, while hard seals are metallic