Some high temperature resistant valves
have been introduced before, but one of its design points and some required materials will be introduced to you today. Valves are an integral part of fluid control activities and play an important role in controlling all fluids. With the development of modern technology, the demand for high temperature valves in engineering projects is increasing. High temperature valves are used in petrochemical, chemical, electric power and other industries. The long-term action of high temperature will affect the physical and mechanical properties of metal materials, so in the design and material selection of high-temperature valves, it is necessary to pay attention to the influence of high temperature. Design points: When designing high temperature valves, special attention should be paid to the influence of thermal expansion, heat exchange and mechanical properties of materials. Depending on the coefficient of thermal expansion of the material, the thermal load of the parts, etc., the performance of the valve seat and valve core heated almost simultaneously at high temperature, such as the amount of expansion, is also different. In order to effectively reduce the seizing or scratching caused by the temperature between the parts, it is necessary to appropriately increase the working gap between the valve parts. The increase of the gap should be determined by the thermal expansion coefficient of the material, the stress and the actual use temperature. Due to the high temperature exchange, the connection between the valve seat and the guide cover becomes loose, and the fatigue aging of the valve components becomes serious. In the design, it is necessary to take corresponding countermeasures according to the specific situation. High temperatures can significantly affect the mechanical properties of materials. Depending on the temperature, the strength, hardness, plasticity, elastic modulus, Bolsang ratio, etc. of the material are also different. The influence of these factors on valve performance should be fully considered in the design. Materials required for valve body: In order to ensure the requirements of high temperature valve for structural materials, hardness, impact force and wear resistance are required. We should focus on the thermal expansion of the substance while selecting the material in the valve body. In addition, the probability of component damage in high temperature environments must also be considered. The material in the valve body is made of stainless steel and can be welded on the surface. The wear resistance and corrosion resistance of the valve body can be guaranteed. It can work normally in high temperature environment. In the design of the casing, the pressure generated during specific use is considered, and by designing the casing to a fixed value for the pressure resistance of the casing, sufficient pressure resistance can be ensured and corrosion can be effectively minimized. Common materials for high temperature valves and their maximum use temperature: During the design of high temperature valves, attention should be paid to the use temperature not exceeding the maximum allowable use temperature of the material. According to ASME B31.3, the maximum service temperature of commonly used materials for high temperature valves is shown in the figure below. It should be noted that factors such as medium corrosion and stress level should also be considered in the actual valve design, and the allowable temperature of the valve material is actually lower than the value in the table. How about, do you have a further understanding of high temperature resistant valves? If you have any questions, you can consult Lianke Valve Co.,Ltd. Contact: +86-577-8585 9626. .
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