The influence of sealing surface material and processing state on the sealing performance of high pressure ball valve

The sealing surface material and its processing state have a great influence on the leakage of the high-pressure ball valve. The method to ensure the sealability of the link is to fit the two surfaces together so that the remaining gaps on the surfaces become the shape of pores to prevent fluid from passing through. The size of the remaining gap depends on the microscopic unevenness of the sealing surface. Therefore, if a harder material (such as a steel sealing ring) is used to make the same degree of sealing, it must have a larger specific pressure, and its value must exceed the softer The specific pressure value of the material (such as a seal ring made of brass).

The surface treatment state related to the connection of the sealing surface of the high-pressure ball valve: the deformation of the wave crest, the change of the size and the sealing gap, and other phenomena all occur on the metal surface. It is clear that the performance of the surface is obviously different from the performance of the base material. Therefore, the same test piece, after two different processing methods, although the surface finish is the same, the results obtained by the test are different.