Are you still worried about the leakage of stainless steel valves? Then you can take a look at this article.

 

Sealing is to prevent leakage, so the sealing principle of stainless steel valve is also studied from the prevention of leakage. There are two main factors that cause leakage. One is the main factor affecting the sealing performance, that is, there is a gap between the sealing pair, and the other is the pressure difference between the two sides of the sealing pair. The sealing principle of stainless steel valve is also analyzed from the four aspects of liquid sealing, gas sealing, leakage channel sealing principle and stainless steel valve sealing pair.

 

 

1. Liquid tightness

The tightness of the liquid is carried out by the viscosity and surface tension of the liquid. When the leaking capillary tube of the stainless steel valve is filled with gas, the surface tension may repel the liquid or introduce the liquid into the capillary tube. This forms the tangent angle. When the tangent angle is less than 90 °, the liquid will be injected into the capillary tube, which will cause leakage.

The reason for the leakage is the different nature of the medium. Experiments with different media will give different results under the same conditions. Water, air or kerosene can be used. And when the tangent angle is greater than 90 °, leakage will also occur. Because it is related to the grease or waxy film on the metal surface. Once the film on these surfaces is dissolved, the characteristics of the metal surface will change. The originally repelled liquid will wet the surface and leak. In view of the above situation, according to the Poisson formula, the purpose of preventing leakage or reducing the amount of leakage can be achieved when the diameter of the capillary is reduced and the viscosity of the medium is large.