In the power plant feedwater pump system, the manual flange stop valve J41H-10C plays a vital role. Among them, the performance of the valve disc sealing surface material in a long-term high-temperature and high-pressure steam environment is directly related to the service life of the valve and the stable operation of the entire feedwater pump system.

1. Analysis of the erosion of the J41H-10C valve disc sealing surface material in a high-temperature and high-pressure steam environment

Erosion principle and characteristics of high-temperature and high-pressure steam environment

The high-temperature and high-pressure steam environment has unique characteristics, with fast steam flow rate, high temperature and high pressure. In such an environment, when steam passes through the valve, it will produce a high-speed impact on the valve disc sealing surface. Erosion occurs due to the tiny particles carried by the high-speed fluid or the high-speed impact of the fluid itself, causing the sealing surface material to gradually wear and peel off. For the manual flange stop valve J41H-10C, its valve disc sealing surface is in the direct scouring path of steam and faces severe tests.

Characteristics and potential problems of stainless steel (H) sealing surface material

Stainless steel, as a sealing surface material, has certain corrosion resistance and high strength. However, in a long-term high-temperature and high-pressure steam environment, there are also some potential problems with the stainless steel sealing surface. On the one hand, high temperature will change the structure of stainless steel, resulting in a decrease in its hardness and strength. For example, after exceeding a certain temperature threshold, the alloying elements in stainless steel may diffuse and redistribute, affecting its original performance. On the other hand, the erosion of high-speed steam will continuously wear the sealing surface. Even if stainless steel has a certain wear resistance, the flatness and integrity of the sealing surface may still be damaged over a long period of time, thus causing erosion.

Erosion cases and data support in actual operation

In the actual operation of some power plants, there have been cases of erosion of the J41H-10C valve disc sealing surface. Through the analysis of these cases, it was found that after a certain period of operation, the sealing surface showed obvious signs of wear and the sealing performance decreased. Relevant data show that under certain conditions with high temperature and high pressure steam parameters, the wear depth of the sealing surface can reach the millimeter level after thousands of hours of operation. This not only affects the normal switching function of the valve, but may also cause steam leakage, reduce the efficiency of the system, and even pose a threat to the safe operation of the power plant.

2. Strategies for optimizing the sealing surface structure to extend life

Optimize the geometry of the sealing surface

The geometry of the sealing surface also has an important influence on its erosion resistance. Traditional flat sealing surfaces are prone to local wear under high-temperature and high-pressure steam erosion. Special geometric shapes such as conical sealing surfaces or spherical sealing surfaces can be considered. The conical sealing surface can produce a self-tightening effect when closed, enhancing the sealing effect. At the same time, when steam is eroded, the pressure distribution is more uniform, reducing the possibility of local erosion. The spherical sealing surface can better adapt to the slight deviation when the valve is closed and reduce the wear of the sealing surface. Through numerical simulation and practical application verification, the optimized geometric sealing surface can effectively reduce the degree of erosion.

Using a composite sealing surface structure

The composite sealing surface structure combines materials with different properties to give full play to their respective advantages. For example, a layer of cemented carbide material with higher hardness and better high-temperature resistance can be inlaid on the basis of a stainless steel sealing surface. Cemented carbide can withstand direct erosion of high-temperature and high-pressure steam, while stainless steel provides good matrix support and certain toughness. This composite structure can greatly improve the erosion resistance and service life of the sealing surface. In practical applications, the operating life of valves with a composite sealing surface structure has been significantly improved compared with single stainless steel sealing surface valves under the same working conditions.

Strengthen the lubrication and protection measures of the sealing surface

During the operation of the valve, the introduction of appropriate lubrication measures can reduce the friction and wear between the sealing surfaces. High-temperature resistant lubricants can be used to form a protective film on the surface of the sealing surface to reduce the direct contact between the steam and the sealing surface. At the same time, protective devices such as filters or buffer devices can be set at the inlet and outlet of the valve to reduce the impact of impurities carried in the steam on the sealing surface. These protective measures can reduce the risk of erosion of the sealing surface from multiple aspects and extend its service life.

By optimizing the sealing surface structure of the stop valve J41H-10C, the erosion resistance of the sealing surface can be effectively improved, its service life can be extended, and a stronger guarantee can be provided for the stable and efficient operation of the power plant. In actual applications, power plants need to combine their own operating characteristics and comprehensively consider various optimization strategies to achieve the best protection of the valve sealing surface, reduce maintenance costs, and improve overall economic benefits.

When looking for high-quality, reliable globe valves, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:

E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

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