1. Sealing auxiliary structure

在温度或密封力的变化下，密封副的结构会发生变化。这种变化会影响和改变密封副之间的作用力，从而降低阀门密封的性能。因此，在选择密封件时，务必选择弹性变形的密封件。同时，注意密封面的宽度。原因是密封副的接触面不能完全匹配。当密封面宽度增加时，应增加密封所需的力。

Under the change of temperature or sealing force, the structure of sealing pair will change. This change will affect and change the force between the sealing pairs, thus reducing the sealing performance of the valve. Therefore, when selecting seals, be sure to select seals with elastic deformation. At the same time, pay attention to the width of the sealing surface. The reason is that the contact surface of the sealing pair cannot match completely. When the width of the sealing surface increases, the force required for sealing shall be increased.

2.密封面比压

2. Specific pressure of sealing surface

密封面上的比压力影响阀门的密封性能和使用寿命。因此，密封面的比压也是一个非常重要的因素。在相同条件下，比压过高会导致阀门损坏，但比压过低会导致阀门泄漏。因此，我们需要充分考虑特定压力在设计中的适用性。

The specific pressure on the sealing surface affects the sealing performance and service life of the valve. Therefore, the specific pressure of the sealing surface is also a very important factor. Under the same conditions, too high specific pressure will lead to valve damage, but too low specific pressure will lead to valve leakage. Therefore, we need to fully consider the applicability of specific pressure in design.

3.介质的物理性质

3. Physical properties of medium

介质的物理性质也会影响阀门的密封性能。这些物理性质包括温度、粘度和表面亲水性。温度的变化不仅影响密封副的松弛和零件尺寸的变化，而且与气体的粘度有着不可分割的关系。气体粘度随温度的升高或降低而变大或减小。因此，为了减少温度对阀门密封性能的影响，在设计密封副时，应将其设计成弹性阀座等具有热补偿的阀门。粘度与流体的渗透性有关。在相同条件下，粘度越大，流体的渗透率越小。表面的亲水性是指去除金属表面上的薄膜。因为这种薄薄的油膜会破坏表面的亲水性，堵塞流体通道。

The physical properties of the medium will also affect the sealing performance of the valve. These physical properties include temperature, viscosity and surface hydrophilicity. The change of temperature not only affects the relaxation of sealing pair and the change of part size, but also has an inseparable relationship with the viscosity of gas. The gas viscosity increases or decreases with the increase or decrease of temperature. Therefore, in order to reduce the influence of temperature on the sealing performance of the valve, when designing the sealing pair, it should be designed as a valve with thermal compensation such as elastic valve seat. Viscosity is related to the permeability of the fluid. Under the same conditions, the greater the viscosity, the smaller the fluid permeability. The hydrophilicity of the surface refers to the removal of the film on the metal surface. Because this thin oil film will destroy the hydrophilicity of the surface and block the fluid channel.

4.密封副质量

4. Quality of sealing pair

密封副的质量主要是检查材料的选择、匹配和制造精度。例如，阀盘与阀座的密封面非常一致，可以提高密封性能。环向波纹度较大的特点是具有良好的迷宫密封性能。

The quality of sealing pair is mainly to check the selection, matching and manufacturing accuracy of materials. For example, the sealing surface of the valve disc and the valve seat is very consistent, which can improve the sealing performance. The characteristic of large circumferential waviness is good labyrinth sealing performance.

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