Improper material selection, improper installation, poor use and maintenance are caused by such factors. The so-called natural damage refers to the damage caused by the valve wear under normal working conditions and the media that cannot prevent corrosion and erosion of the sealing surface of the exhaust valve. .The damage blanks that cannot be resolutely prevented are called natural damage.
The causes of damage can be attributed to the following:
1. The processing quality of the sealing surface of the exhaust valve is not good: the main appearance has defects such as cracks, pores and ballast on the sealing surface of the exhaust valve, due to improper selection of surfacing and heat treatment standards, as well as in the process of surfacing and heat treatment Caused by poor operation, the sealing surface of the valve is too high or too low, due to incorrect material selection or improper heat treatment, the sealing surface of the exhaust valve is uneven in hardness and not resistant to corrosion, mainly due to the bottom metal during the surfacing process Blowing to the top, it dilutes the alloy composition of the sealing surface of the valve. There are also design problems.
2. Damage caused by improper selection and poor operation: the main appearance is not to select the valve according to the working conditions, and the cut-off valve is used as a throttle valve, the closing pressure is too large, and the closing is too fast or the closing is not strict, so that the exhaust The valve sealing surface was eroded and worn.
3. Incorrect installation and inadequate maintenance cause the sealing surface of the exhaust valve to work abnormally, the valve runs ill, and damages the sealing surface of the exhaust valve prematurely.
4. Chemical corrosion of the medium: the medium around the sealing surface of the exhaust valve, under the condition that no current is generated, the medium directly plays a chemical role with the sealing surface of the exhaust valve, and the corrosion package is the sealing surface of the exhaust valve.
5. Electrochemical corrosion: The sealing surfaces of the exhaust valve are in contact with each other, the contact between the sealing surface of the exhaust valve and the closing piece and the valve body, and the concentration difference of the medium, the oxygen concentration difference, etc., will cause a potential difference, and electrochemical corrosion will occur. The valve sealing surface of the anode is corroded.
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