1. Sealing auxiliary structure

在溫度或密封力的變化下，密封副的結構會發生變化。這種變化會影響和改變密封副之間的作用力，從而降低閥門密封的性能。因此，在選擇密封件時，務必選擇彈性變形的密封件。同時，注意密封面的寬度。原因是密封副的接觸面不能完全匹配。當密封面寬度增加時，應增加密封所需的力。

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.密封面比壓

2. Specific pressure of sealing surface

密封面上的比壓力影響閥門的密封性能和使用壽命。因此，密封面的比壓也是一個非常重要的因素。在相同條件下，比壓過高會導致閥門損壞，但比壓過低會導致閥門泄漏。因此，我們需要充分考慮特定壓力在設計中的適用性。

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.介質的物理性質

3. Physical properties of medium

介質的物理性質也會影響閥門的密封性能。這些物理性質包括溫度、粘度和表面親水性。溫度的變化不僅影響密封副的松弛和零件尺寸的變化，而且與氣體的粘度有著不可分割的關系。氣體粘度隨溫度的升高或降低而變大或減小。因此，為了減少溫度對閥門密封性能的影響，在設計密封副時，應將其設計成彈性閥座等具有熱補償的閥門。粘度與流體的滲透性有關。在相同條件下，粘度越大，流體的滲透率越小。表面的親水性是指去除金屬表面上的薄膜。因為這種薄薄的油膜會破壞表面的親水性，堵塞流體通道。

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.密封副質量

4. Quality of sealing pair

密封副的質量主要是檢查材料的選擇、匹配和制造精度。例如，閥盤與閥座的密封面非常一致，可以提高密封性能。環向波紋度較大的特點是具有良好的迷宮密封性能。

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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