Causes damage to the sealing surface of the valve
Mechanical damage, the sealing surface will be damaged by scratches, bumps, crushing, etc. during opening and closing. Between the two sealing surfaces, under the action of high temperature and high pressure, atoms permeate and ooze out, resulting in blocking phenomenon. When the two sealing faces move relative to each other, the adhesion is easily pulled. The higher the roughness of the surface of the sealing surface, the easier it is that the valve will be damaged and crushed during the sealing process, and the sealing surface will be partially worn or indented. Erosion of the medium, which is the result of wear, rinsing, and cavitation of the sealing surface when the medium is active. When the medium is at a certain speed, the floating fine particles in the medium resist the sealing surface, causing local damage. The high-speed moving medium directly flushes the sealing surface to cause local damage, and when the medium is mixed and partially vaporized, the gas is blasted. Impact on the surface of the sealing surface, causing local damage. The erosion of the medium and the alternating chemical attack will strongly etch the sealing surface. Electrochemical erosion, contact between the sealing surfaces, contact between the sealing surface and the sealing body and the valve body, concentration difference of the medium, oxygen concentration difference, etc., will cause a potential difference, causing electrochemical erosion, causing the sealing surface of the anode side to be eroded. Chemical attack of the medium, the medium near the sealing surface does not generate current, the medium directly chemicalizes with the sealing surface, eroding the sealing surface. Damage caused by improper selection and poor handling. The main performance is that the valve is not used according to the working conditions, and the shut-off valve is used as a throttle valve, which leads to the closing pressure is too large and the sealing is too fast or the sealing is not tight, so that the sealing surface is eroded and worn. The sealing surface is of poor quality, mainly due to defects such as cracks, pores and pinch on the sealing surface. It is caused by improper selection of surfacing and heat treatment specifications and poor handling during surfacing and heat treatment. The sealing surface is too high. Or too low, because of the wrong choice of materials or improper heat treatment, the hardness of the sealing surface is uneven and not resistant to erosion, mainly because the underlying metal is blown onto the surface during the surfacing process, which dilutes the alloy composition of the sealing surface. of. Of course, there are also design issues in it. Therefore, the causes of damage to the sealing surface can be summarized as follows. Concerned about surprises Label: Causes damage to the sealing surface of the valve Previous: Sealing technology and data analysis of hydraulic valve Next: Characteristics of unloader device Escalator,Flat Escalator,Escalator Stairs,Escalator Lift MAURER TECHNOLOGIES CO., LTD. , https://www.maurer-elevator.com
Improper installation and poor maintenance lead to abnormal operation of the sealing surface, the valve is running sick, and the sealing surface is damaged prematurely.
The cause of damage to the sealing surface is either damage or natural damage. Man-made damage is caused by factors such as poor design, poor manufacturing, improper material selection, improper installation, poor use, and poor maintenance. Natural damage is the wear of the valve under normal working conditions, and it is the damage caused by the inevitable erosion and erosion of the sealing surface by the medium. 