High-pressure valve maintenance manufacturers talk about how to improve the service life of high-pressure valves.
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Release Time：2022-12-21
The main reason for the failure of ultra-high pressure valves is cavitation and erosion. There are many factors that affect cavitation and erosion, mainly the mechanical properties of materials, fluid mechanics factors and environmental effects. In order to improve the valve's anti-cavitation and erosion wear ability, you can use a variety of methods, the following high-pressure valve maintenance manufacturers talk about how to improve the service life of high-pressure valves.
The main reason for the failure of high-pressure valves is cavitation and erosion. There are many factors that affect cavitation and erosion, mainly the mechanical properties of materials, fluid mechanics factors and environmental effects. In order to improve the valve's anti-cavitation and erosion wear ability, you can use a variety of methods, the following high-pressure valve maintenance manufacturers talk about how to improve the service life of high-pressure valves.
1. high pressure valve maintenance manufacturers talk about material selection
In order to improve the anti-erosion ability of high-pressure valves, anti-corrosion materials are generally selected.
1. High hardness material
2. Acid etching protective film material
3. Material with high yield point and good stability.
4. Materials with high fatigue strength
In order to improve the various properties of the material, one is to use alloying, and the other is to use appropriate heat treatment. The alloying method is to develop new materials with various special properties by changing the chemical composition of steel. High-pressure valve maintenance manufacturers believe that the heat treatment method does not change the chemical composition of the steel, the application of different heating, heat preservation, cooling, change the structure of the steel, improve the performance of the material.
2. heat treatment and surface hardening
1. Vacuum heat treatment.
Heating does not occur oxidation, decarburization and other corrosion, with surface deoiling and degreasing purification. In the vacuum state, the hydrogen, nitrogen, oxygen and other gases absorbed by the material during the smelting process can be removed, and the quality and performance of the material can be improved. For example, after vacuum heat treatment of the high-pressure needle valve made of W18Cr4V, the impact toughness of the needle valve is effectively improved, and the mechanical properties and service life are improved.
2. Surface strengthening treatment.
Surface quenching (flame heating, high frequency heating surface quenching, contact electric heating surface quenching, electrolyte heating surface quenching, laser electron beam heating surface quenching, etc.), carburizing, nitriding, cyanidation, boronizing, infiltrating metal (TD method), laser strengthening, chemical vapor deposition (PCVD method)
3. the use of new engineering materials
When selecting the material of the flow parts of the high-pressure valve, it should be considered that the weight loss at different flow rates is also different.
High pressure (above 400MPa) uses high hardness, hard and hard materials, such as tool steel and hard alloy.
Under low pressure (100 ~ 400MPa), the material must have good plastic, toughness and high hardness. Such as the United States HIP high-pressure needle valve, working pressure of 690MPa austenitic 316 stainless steel, working pressure of 1034MPa martensitic precipitation hardening stainless steel 17-4PH. Foreign commonly used air corrosion resistant parts materials, valves, valves and other martensitic stainless steel and tool steel, valve base using chromium aluminum steel and stainless steel.
With the successful development of industrial ceramic technology, ceramic material valves have also appeared. Ceramic materials have higher corrosion resistance at lower stamping angles, but as the taper of the valve pin decreases, the end strength also decreases, and the foundation force between the valve pin and the valve seat also decreases, which affects the reliability of the seal. Therefore, high-pressure valve maintenance manufacturers believe that the use of ceramic materials to make valve pins, not only to consider the size of the taper, but also to consider the strength.
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