Causes of Damage to the Valve Sealing Surface

1.Incorrect installation of the valve causes damage to the sealing surface.

2.Damage caused by improper selection and poor operation. The valve is not selected according to the working conditions, and the cut-off valve is used as a throttle valve, resulting in excessive closing specific pressure and closing too fast or not tightly, causing the sealing surface to be eroded and worn.

3.The processing quality of the sealing surface is not good, mainly manifested in defects such as cracks, pores and ballast on the sealing surface, which are caused by improper selection of surfacing and heat treatment specifications and poor operation. The hardness of the sealing surface is too high or too low because of wrong material selection or improper heat treatment. The sealing surface has uneven hardness and is not resistant to corrosion, mainly because the underlying metal is blown onto it during the surfacing process, which dilutes the alloy composition of the sealing surface.

4.Mechanical damage, the sealing surface will be damaged by scratches, bumps, crushing, etc. during the opening and closing process. Between the two sealing surfaces, under the action of high temperature and high pressure, atoms permeate and seep each other, resulting in adhesion. When the two sealing surfaces move to each other, the adhesion is easily torn.

5.Erosion of the medium, which is the result of wear, washing and cavitation on the sealing surface when the medium is active.