In the boiler system of a thermal power station, the denitrification sootblowing process is a crucial link, aimed at reducing nitrogen oxide emissions and maintaining efficient operation of the boiler. However, the media used in this process often have the characteristics of high temperature, high pressure, strong corrosiveness and may contain solid particles, which puts extremely high demands on the performance of the check valve. As a key equipment in the system, the H64H-250 check valve effectively responds to the special properties of the denitrification sootblowing medium through a series of carefully designed sealing and anti-corrosion measures, ensuring the stable operation of the system.

The H64H-250 check valve adopts a swing design, which enables the valve to open automatically when the fluid flows, and can be quickly closed when the fluid flows back, effectively preventing the backflow of the fluid. The swing structure not only improves the working efficiency of the valve, but also reduces the difficulty of operation, providing reliable fluid control for the denitrification sootblowing process.

In view of the corrosiveness of the denitrification sootblowing medium, the sealing surface of the H64H-250 check valve is made of iron-based alloy or Stellite alloy surfacing. These materials have excellent wear resistance, high temperature resistance, corrosion resistance and abrasion resistance, and can maintain long-term stable sealing effect in harsh working environments. At the same time, the valve sealing pair is precisely machined and matched to ensure the close fit of the sealing surface and reduce the risk of medium leakage.

In order to improve the reliability and durability of the seal, the H64H-250 check valve also uses elastic sealing elements such as rubber sealing rings or metal bellows. These elements can provide additional sealing force when the valve is closed, effectively compensate for the changes in the sealing surface gap caused by medium pressure fluctuations or temperature changes, and ensure the sealing performance of the valve under various working conditions.

Anti-corrosion measures

The main material of the H64H-250 check valve is alloy steel or stainless steel with good corrosion resistance. These materials can resist the corrosive components in the denitrification sootblowing medium and extend the service life of the valve. At the same time, the inner cavity and key components of the valve also adopt corresponding anti-corrosion treatment measures, such as spraying corrosion-resistant coatings or electrochemical protection.

In order to improve the corrosion resistance of the valve, the key components of the H64H-250 check valve also adopt a variety of surface treatment technologies. For example, processes such as nitriding, boronizing, chrome plating, and nickel plating can significantly improve the surface hardness and corrosion resistance of the material and reduce the erosion of the valve by the medium. In addition, thermal spraying technology is also widely used in valve manufacturing. By forming a dense anti-corrosion coating on the surface of the valve, the direct contact between the medium and the valve body material is effectively isolated, further improving the anti-corrosion performance of the valve.

The structural design of the H64H-250 check valve also fully considers the need for anti-corrosion. For example, the design of the pin shaft rotating around the outside of the valve seat reduces the violent impact and friction wear during closing. At the same time, the pin shaft and the valve disc are connected with an internal structure, and there is no external leakage point, which improves the reliability of use. In addition, the connection flange and sealing surface of the valve are also designed to be easy to maintain and replace, which is convenient for users to carry out regular maintenance and anti-corrosion treatment.

The H64H-250 check valve effectively copes with the special properties of the denitrification sootblowing medium in the boiler of a thermal power station through a series of measures such as swing design, high-quality sealing materials, elastic sealing elements, corrosion-resistant material selection, surface treatment technology, and structural design optimization. These measures not only improve the sealing performance and corrosion resistance of the valve, but also extend the service life of the valve, providing a strong guarantee for the stable operation of the thermal power station.

Yoyik offers various types of valves and pumps and its spare parts for power plants:
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Pump driven screw ACF090N5ITBP
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Stop valve J61Y-P42.3120I
Turbine Butterfly Valve D371J-10
Pneumatic stop valve J661Y-40
Three-way valve J21Y-320P
Instrument valve J21H-320P
Reheater inlet plugging valve SD61H-P3866I
Electric butterfly valve HHD971X-150LB
Check valve H67Y-2000LB A105
Safety valve A68Y-P55.5150V
Electric stop valve J961Y-P5540
Check valve H67Y-64I