What influence choosing the rubber o ring

The technical status and working conditions of the parts, rubber O ring materials and sealing performance of rubber O ring has a certain effect, for example

1) Part binding surface state. Different parts of the surface state, the use of the seal gasket is also different. For example: smooth parts of the surface, the general should be used in low pressure, soft and thin sealing gasket; high pressure working conditions, the strength of the parts should be used when the thickness of thick and soft seal, should not use metal gasket. Because the pressing force is too large, resulting in a larger deformation of the bolt, the compression force of the parts decreases, but to make the sealing gasket effective. Only in the case of a narrow and smooth parts of the binding surface can be used metal gasket, because at this time in the case of the same bolt tightening force seal gasket has a greater pressure, you can maintain adequate sealing.

2) surface roughness. This has a great influence on the sealing effect, especially when the non soft gasket is used. This is because part of the combination of surface roughness is one of the main causes of leakage. Soft gasket of parts with surface roughness is low. This is because it is easily deformed, can block the two parts with micro convex body contact with each other and the formation of the leakage passage, thus ensuring the good sealing effect.

3)  the hardness difference between the surface of the part and the sealing layer. Using pad seal is the sealing pad elastic or plastic deformation, to fill the parts with small surface uneven, prevent fluid leakage. Therefore, the hardness of the gasket is lower than the hardness of the parts, the greater the difference between the two, the easier it is to achieve the seal.

4)  black metal parts with surface should be used copper metal gasket, and cannot use the aluminium metal gasket, lest black metal parts suffered electric corrosion damage.

    Sealing is a comprehensive discipline, it is the study of sealing materials, sealing device design and sealing mechanism of science, is a multidisciplinary interdisciplinary edge. We should grasp the detailed currently all, new seal form and seal material, seal components, according to different working conditions and different working pressure, the working medium to choose proper sealing structure and sealing components, in order to achieve good sealing effect.