Mechanical damage, the sealing surface will cause scratches, bumps, crushes and other damage during opening and closing. Between the two sealing surfaces, atomic permeation and exudation occur under the action of high temperature and high pressure, resulting in adhesion phenomenon. When the two sealing surfaces move each other, the adhesion can easily tear. The higher the roughness of the surface of the sealing surface, the easier this phenomenon will occur. During the closing process of the regulating valve, the valve flap will scratch and crush the sealing surface during the repositioning process, so that the sealing surface is locally worn or indented.
Erosion of the medium, which is the result of wear, flushing, and cavitation of the sealing surface when the medium is active. When the medium is under a certain speed, the suspended fine particles in the medium collide with the sealing surface to cause local damage, and the high-speed moving medium directly flushes the sealing surface to cause local damage, and when the medium is mixed and local vaporized, the gas bubble burst is generated. Impact the sealing surface surface, causing partial damage. The erosion of the medium, combined with the alternating effect of chemical attack, strongly erodes the sealing surface.
Electrochemical erosion, contact of the sealing surfaces, contact between the sealing surface and the closing body and the valve body, and the concentration difference of the medium, the oxygen concentration difference and the like, all generate a potential difference, and electrochemical erosion occurs, resulting in erosion of the sealing surface of the anode.
The chemical erosion of the medium, the medium near the sealing surface, in the case of no current, the medium directly acts as a chemical reaction with the sealing surface and erodes the sealing surface.
Improper installation and poor maintenance caused the sealing surface to work abnormally, and the drain valve malfunctioned to prematurely damage the sealing surface.
Improper selection and handling caused by damage. The main performance is that the valve is not selected according to the working conditions, and the cut-off valve is used as a throttle valve, which results in too large closed pressure and too fast sealing or lax sealing, so that the sealing surface is subject to erosion and wear.
Sealing surface processing quality is not good, mainly in the sealing surface cracks, pores and pinch defects such as defects, due to improper selection of surfacing and heat treatment and welding and heat treatment caused by poor handling, the sealing surface hard over high Or too low, due to the wrong choice of materials or improper heat treatment, the uneven hardness of the sealing surface, not resistant to erosion, mainly because the bottom metal is blown to the top during the welding process, dilute the sealing surface alloy composition caused of. Of course, there are also design issues.
Causes of damage to the sealing surface can be summarized as follows.
The cause of damage to the sealing surface is man-made damage and 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 under the normal working conditions of the valve, and it is the damage caused by the inevitable erosion and erosion of the sealing surface.
Erosion of the medium, which is the result of wear, flushing, and cavitation of the sealing surface when the medium is active. When the medium is under a certain speed, the suspended fine particles in the medium collide with the sealing surface to cause local damage, and the high-speed moving medium directly flushes the sealing surface to cause local damage, and when the medium is mixed and local vaporized, the gas bubble burst is generated. Impact the sealing surface surface, causing partial damage. The erosion of the medium, combined with the alternating effect of chemical attack, strongly erodes the sealing surface.
Electrochemical erosion, contact of the sealing surfaces, contact between the sealing surface and the closing body and the valve body, and the concentration difference of the medium, the oxygen concentration difference and the like, all generate a potential difference, and electrochemical erosion occurs, resulting in erosion of the sealing surface of the anode.
The chemical erosion of the medium, the medium near the sealing surface, in the case of no current, the medium directly acts as a chemical reaction with the sealing surface and erodes the sealing surface.
Improper installation and poor maintenance caused the sealing surface to work abnormally, and the drain valve malfunctioned to prematurely damage the sealing surface.
Improper selection and handling caused by damage. The main performance is that the valve is not selected according to the working conditions, and the cut-off valve is used as a throttle valve, which results in too large closed pressure and too fast sealing or lax sealing, so that the sealing surface is subject to erosion and wear.
Sealing surface processing quality is not good, mainly in the sealing surface cracks, pores and pinch defects such as defects, due to improper selection of surfacing and heat treatment and welding and heat treatment caused by poor handling, the sealing surface hard over high Or too low, due to the wrong choice of materials or improper heat treatment, the uneven hardness of the sealing surface, not resistant to erosion, mainly because the bottom metal is blown to the top during the welding process, dilute the sealing surface alloy composition caused of. Of course, there are also design issues.
Causes of damage to the sealing surface can be summarized as follows.
The cause of damage to the sealing surface is man-made damage and 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 under the normal working conditions of the valve, and it is the damage caused by the inevitable erosion and erosion of the sealing surface.
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