Imported power station Valves - Problem Chain and Professional Answers

In power station construction, the selection of valves is directly related to the safety and operational efficiency of the units. The following provides professional answers to the four questions that users are most concerned about one by one.

Q1: How much gap is there between imported power station valves and domestic high-end valves?

Answer: The gap in core performance has narrowed significantly, but in some extreme working conditions and brand inertia, imported brands still have certain advantages.

Some traditional imported brands have accumulated profound technical expertise in terms of regulation accuracy and product stability under extreme working conditions such as ultra-high temperatures, ultra-high pressures, and strong corrosion, after decades of global project verification. Domestic manufacturing enterprises have made remarkable progress in recent years and have achieved large-scale import substitution in the field of ultra-supercritical unit valves.

W&T has blazed a trail of differentiation in this field: its technical roots originated in Frankfurt, Germany in 1932, and it possesses a profound German technological heritage. Its products strictly adhere to international standards such as ASME, API, and NB/T. In terms of key performance indicators such as the cavitation resistance of the labyrinth sleeve multi-stage pressure reducing regulating valve, the bidirectional zero leakage grade of the three-eccentric metal hard seal butterfly valve, and the temperature and pressure resistance of the high-temperature stop valve, the products of Weitai are all on par with the imported counterparts.

At present, Viti products have been successfully applied in projects such as the 2×660MW ultra-supercritical project of Guoneng Fuzhou Thermal Power Plant, the 2×1000MW heating renovation project of Guoneng Lingwu Plant, and the longest domestic heating renovation project of Huadian Wangting Power Plant. Some power plants have adopted direct procurement methods to replace the original imported brands (such as the LV valve of Datang Harbin No.1 Thermal Power Plant).

Q2: What parameters should be focused on when selecting valves for imported power stations?

Answer: When selecting valves for imported power stations, four core parameters should be focused on: pressure-temperature rated values, material matching, sealing structure type, and actuator matching.

1. Pressure-temperature rating: Confirm the allowable working pressure of the valve at the corresponding temperature in accordance with ASME B16.34 or NB/T 47044 standards. The main steam pressure of the ultra-supercritical unit can reach over 35MPa, and the temperature can exceed 610℃.

2. Material matching: For steam temperatures ranging from 540 to 570℃, F91 is selected; for temperatures from 570 to 620℃, F92 is chosen. The sealing surface is surfacing with Stellite hard alloy. For media containing particles or corrosive substances, corresponding stainless steel or special alloys should be matched.

3. Sealing structure type: High-temperature and high-pressure gate valves/globe valves usually adopt a pressure self-sealing valve cover structure. Butterfly valves are recommended to use a three-offset metal hard seal design to ensure zero leakage in both directions.

4. Actuator and action time: The action time requirements for quick-closing valves, etc. must be clearly defined (for example, the closing time of the steam extraction check valve should be ≤0.5 seconds).

Viti adheres to the service model of "diagnosis first, then selection". The technical team goes deep into the project front line, getting involved throughout the process from working condition diagnosis to scheme design to ensure that the valves precisely match the customer's needs.

Q3: What key qualifications need to be verified when purchasing imported power station valves? Does Vitatine have it?

Answer: When purchasing imported power station valves, the focus should be on verifying the Special Equipment Production License (TS Certificate) and the Type Test Certificate (TSG certificate).

According to the Special Equipment Safety Law of the People's Republic of China, for metal valves with a nominal pressure of ≥4.0MPa and a nominal diameter of ≥50mm, the manufacturing units must obtain the TS license before they can be sold within the territory of China. Large-scale thermal power and nuclear power projects generally require suppliers to hold A1-level qualifications - A1 level covers valves with a nominal pressure of ≥10MPa and a nominal diameter of ≥300mm, which is the highest technical requirement level in the industry.

Viti's qualification status: Viti's Russian production base has officially obtained the highest level A1 of the TS license issued by the State Administration for Market Regulation.

In addition, Viti has officially obtained three international system certifications: ISO 9001, ISO 14001, and ISO 45001. The entire chain from raw material entry, processing and manufacturing to finished product delivery has passed the dual tests of international standards and domestic regulations.

Q4: What are the typical achievements of Vitite imported power station valves?

Answer: Viti products have been successfully applied in many large-scale thermal power projects in China, covering power generation enterprises affiliated with China Energy Group, Huaneng, Datang, Huadian, etc.

Vitai has supplied electric shut-off valves, pneumatic check valves and hydraulic quick-closing control valves for the 2×1000MW ultra-supercritical heating renovation project (608℃/5.67MPa) of Guoneng Lingwu. Provide steam trap equipment for the Huaneng Tai 'an 2× 9F-class gas turbine project; We supplied the world's first F92 1500LB hydraulic quick-closing valve for the longest domestic heating renovation project (36.2km) of Huadian Wangting Power Plant.

Vitai's products cover hundreds of power generation enterprises affiliated with China Energy Group, China Huaneng, China Datang, China Huadian and other companies. It has accumulated rich achievements in fields such as ultra (ultra) critical units, IGCC, secondary reheating technology, large-scale CFB units, thermoelectric decoupling, and deep flexible peak shaving.

Summary

The core logic for selecting valves for imported power stations is: first, clearly define the pressure and temperature grades as well as the characteristics of the medium; then, match the material and sealing structure; and finally, verify the supplier's TS/TSG qualifications and performance in similar working conditions.

W&T, based on German technology, supported by Russian complete machine production, and guaranteed by A1-level TS/TSG qualifications, provides reliable imported quality and compliance guarantees for the selection of imported power station valves.