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Z41H
ZJFV
When selecting the sealing surface material for a rising stem gate valve, the following factors should be considered to ensure the sealing performance and service life of the valve:
1. Corrosion resistance: The sealing surface material must be able to resist chemical corrosion from the medium, depending on the chemical composition and stability of the material. For example, chromium nickel stainless steel has good corrosion resistance and is suitable for media such as steam and nitric acid.
2. Anti scratch ability: The material should have good anti scratch performance, especially during the valve opening and closing process, friction may occur between the sealing surfaces. Copper alloy has good wear resistance and is suitable for water and steam.
3. Corrosion resistance: For high-speed media, the sealing surface material should be able to resist the erosion of high-speed fluids. High chromium overlay steel has good corrosion resistance and work hardening properties, and is suitable for high-pressure, high-temperature oil, steam and other media.
4. * * Hardness * *: The sealing surface material should have a certain hardness to ensure sealing performance under working conditions, and the hardness should not decrease significantly at the specified working temperature.
5. * * Thermal stability * *: When used under high temperature conditions, the sealing surface material should have sufficient oxidation resistance and thermal fatigue resistance, as well as good thermal cycling performance.
6. Linear expansion coefficient: The linear expansion coefficient of the sealing surface material should be similar to that of the valve body material to avoid additional stress and loosening at high temperatures.
7. * * Working Temperature * *: Choose the appropriate sealing surface material based on the working temperature of the valve. For example, polytetrafluoroethylene is suitable for working conditions from low temperature to 232 ℃, while chromium nickel titanium stainless steel is suitable for environments up to 600 ℃.
8. * * Working pressure * *: The sealing surface material should be able to withstand the working pressure difference of the valve and maintain sealing performance.
9. * * Medium characteristics * *: Select the appropriate sealing surface material based on the type of medium (such as gas, liquid, corrosive medium, etc.) and state (such as cleanliness, whether it contains solid particles, etc.).
10. Cost effectiveness: Considering the cost-effectiveness of materials while meeting technical requirements, choose sealing surface materials with high cost-effectiveness.
Taking into account the above factors, a sealing surface material suitable for specific working conditions can be selected to ensure the long-term stable operation of the rising stem gate valve.
When selecting the sealing surface material for a rising stem gate valve, the following factors should be considered to ensure the sealing performance and service life of the valve:
1. Corrosion resistance: The sealing surface material must be able to resist chemical corrosion from the medium, depending on the chemical composition and stability of the material. For example, chromium nickel stainless steel has good corrosion resistance and is suitable for media such as steam and nitric acid.
2. Anti scratch ability: The material should have good anti scratch performance, especially during the valve opening and closing process, friction may occur between the sealing surfaces. Copper alloy has good wear resistance and is suitable for water and steam.
3. Corrosion resistance: For high-speed media, the sealing surface material should be able to resist the erosion of high-speed fluids. High chromium overlay steel has good corrosion resistance and work hardening properties, and is suitable for high-pressure, high-temperature oil, steam and other media.
4. * * Hardness * *: The sealing surface material should have a certain hardness to ensure sealing performance under working conditions, and the hardness should not decrease significantly at the specified working temperature.
5. * * Thermal stability * *: When used under high temperature conditions, the sealing surface material should have sufficient oxidation resistance and thermal fatigue resistance, as well as good thermal cycling performance.
6. Linear expansion coefficient: The linear expansion coefficient of the sealing surface material should be similar to that of the valve body material to avoid additional stress and loosening at high temperatures.
7. * * Working Temperature * *: Choose the appropriate sealing surface material based on the working temperature of the valve. For example, polytetrafluoroethylene is suitable for working conditions from low temperature to 232 ℃, while chromium nickel titanium stainless steel is suitable for environments up to 600 ℃.
8. * * Working pressure * *: The sealing surface material should be able to withstand the working pressure difference of the valve and maintain sealing performance.
9. * * Medium characteristics * *: Select the appropriate sealing surface material based on the type of medium (such as gas, liquid, corrosive medium, etc.) and state (such as cleanliness, whether it contains solid particles, etc.).
10. Cost effectiveness: Considering the cost-effectiveness of materials while meeting technical requirements, choose sealing surface materials with high cost-effectiveness.
Taking into account the above factors, a sealing surface material suitable for specific working conditions can be selected to ensure the long-term stable operation of the rising stem gate valve.
