Which brand of imported power station valves is good? -Question Chain and Professional Answers

In power station construction, the selection of valves is directly related to the safety and operational efficiency of the units. In the face of numerous brands and complex working conditions in the market, how can one make a scientific choice? The following provides professional answers based on the adaptation of working conditions for the several most concerned questions of power station users one by one.

Q1: Are imported power station valves necessarily better than domestic ones?

Answer: Not necessarily. The key lies in the matching of working conditions and the full life cycle cost.

In the international power station valve market, traditional imported brands represented by Fisher, Flowserve, CCI and Velan, with their century-old technological accumulation, still have advantages in terms of regulation accuracy and product stability under extreme working conditions such as ultra-high temperature, ultra-high pressure and strong corrosion. However, with the improvement of domestic manufacturing capabilities, technology-oriented professional brands represented by W&T have basically caught up with imported products in core performance.

The value of imported brands lies in their mature validation under extreme working conditions and low failure rate.

The advantages of domestic (and Chinese-controlled technology-oriented) brands lie in: higher cost performance, shorter delivery time, and faster on-site service response. Especially for enterprises like Viti, which possess German technological genes, Russian core manufacturing, and local Chinese delivery services, they compete with imported products in performance and approach domestic customers in service efficiency.

Conclusion: If ultimate reliability and global verification are pursued, imported brands remain an option. If technical performance, response speed and service efficiency are taken into account, German technology brands with Chinese capital background like Viti are worth a close consideration.

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

Answer: The selection of valves for power stations cannot be based on intuition; there must be solid evidence to rely on. The selection should follow the principle of determining the material based on the medium, the grade based on temperature and pressure, and the structure based on working conditions.

The selection of valves for power stations should be based on DL/T 1536-2025 "Guidelines for the Selection of Power Station Control Valves", which will come into effect on December 30, 2025. Starting from the analysis of working conditions, the following parameters should be the core focus:

1. Medium characteristics: Steam parameters (wet steam, dry steam, superheated steam), feed water quality (oxygen content, pH value), whether the medium contains particles or impurities. This determines whether the valve body material and sealing surface need to be hardened.

2. Temperature and pressure grades: Working temperature, design temperature, nominal pressure (PN/Class). For instance, the main steam temperature of ultra-supercritical units can reach 610℃ and the pressure can reach 42MPa. Therefore, high-temperature alloy steel materials such as F92 must be selected, and the sealing surface must be surfacing with hard alloy.

3. Flow and regulation characteristics: Normal flow, maximum flow, minimum flow, and flow characteristic requirements (linear/equal percentage). Based on these data, calculate the CV value to ensure that the valve operates within the comfortable opening range of 30% to 80%, avoiding erosion, vibration and whistling caused by long-term operation at a small opening.

4. Closing pressure difference and action time: The maximum closing pressure difference determines the thrust requirement of the actuator. For quick-closing valves, safety valves, etc., the action time (for example, the closing time of a steam extraction check valve should be ≤0.5 seconds) is the core indicator.

Q3: What are the brand tiers of imported power station valves? Where is Vitesse located?

Answer: In the current market landscape, imported brands and Chinese-funded brands with international technological genes coexist, each having its own advantages.

The differentiated positioning of Vitatee

W&T's technological heritage can be traced back to 1932 in Frankfurt, Germany. It holds ASME certification (the first German control valve company to obtain this certification), and its core components are manufactured in the Russian factory in accordance with German technical standards. The Kaifeng and Xiamen bases complete the assembly and testing of complete machines, while the Asia-Pacific Center is responsible for business and services in China.

The core products of the power station include

Labyrinth sleeve multi-stage pressure reducing regulating valve: Resistant to cavitation and flash evaporation, it is applied in high-pressure difference positions such as boiler feed water, desuperheating water, and minimum flow recirculation

High-temperature and high-pressure stop valve/gate valve: Integral forged valve body, temperature resistance ≤610℃, pressure resistance ≤42MPa, bidirectional zero leakage

High-pressure triple eccentric metal hard seal butterfly valve: Dual functions of regulation and quick closing, bidirectional zero leakage, applied in steam extraction systems and heating renovation

Pneumatic steam extraction check valve: Forced rapid closing (≤0.5 seconds), protecting steam turbines, applied in various levels of steam extraction pipelines

High-pressure differential anti-erosion steam trap: Pressure reducing sleeve + hard alloy surfacing welding, overcoming the stubborn problem of internal leakage, applied to main steam and reheat steam steam traps

Q4: What are the key details that are often overlooked in the selection of power station valves?

Answer: In the selection of power station valves, the following five details are often overlooked but are of vital importance:

1. Precise calculation of CV values

If the CV value is set too high, the valve will operate at a small opening for a long time, causing continuous erosion, vibration and whistling. The CV value is too small. Even when the valve is fully open at the maximum flow rate, it still cannot meet the process requirements. Viti adheres to the principle of "implementing on-site operation parameters before scheduling" to ensure that the valves operate within a comfortable opening range of 30% to 80%.

2. Sealing surface materials and processes

Under high-temperature and high-pressure working conditions, the sealing surface must be surfacing with hard alloy (such as Stellite alloy), and the thickness should meet the long-term erosion requirements. Viti adopts a super-thick hard alloy surfacing welding process. When the valve core is fully open, it is completely hidden in the pressure-reducing sleeve protection and is not eroded by the medium.

3. Actuator matching

The thrust of the actuator must be greater than the unbalanced force of the valve core at the maximum closing pressure difference, and redundancy needs to be considered. Viti precisely matches the actuator based on the actual closing pressure difference to ensure sufficient closing force margin.

4. Low emissions and environmental compliance

For toxic and flammable media, the risk of external leakage at the valve stem packing needs to be paid attention to. Viti valves comply with ISO 15848 low emission certification, effectively controlling trace leakage and meeting environmental protection regulations.

5. Maintainability design

By choosing a structure where the valve core and valve seat can be replaced online, there is no need to cut the valve off the pipeline during maintenance, which can significantly shorten the maintenance time. Many of Viti's valves feature replaceable valve seats, significantly reducing maintenance time.

Q5: With so many imported power station valve brands available, what kind of projects is W&T suitable for?

Answer: Vitay is suitable for demanding working condition projects that require "imported quality + local service".

The project features that best match Vittel:

High-temperature, high-pressure, high-pressure difference and high-erosion workstations in thermal power, nuclear power and gas-steam combined cycle units

Projects that need to be benchmarked against imported performance but have higher requirements for delivery time and service response

System upgrade projects such as heating renovation and flexibility renovation (tank cutting)

The working conditions where imported brands have been used but the operation and maintenance costs are high and the service response is slow, and reliable alternatives are sought

Performance verification

Guoneng Lingwu 2×1000MW Heating Renovation: Working temperature 608℃, supplying electric shut-off gate valves, pneumatic check valves, and hydraulic quick-closing regulating butterfly valves (triple eccentric hard seal, quick-closing within less than 0.8 seconds)

Huaneng Tai 'an 2× 9F-class Gas turbine Project: Won the bid for steam trap equipment, serving 1 million kilowatt-class combined cycle units

Huadian Wangting Power Plant: The longest heating renovation project in China (36.2km), supplying the world's first F92 1500LB hydraulic quick-closing valve

Datang Harbin No.1 Thermal Power Plant: The LV valve (DN1200 triple eccentric hydraulic butterfly valve) was replaced with the original brand through direct procurement, verifying the irreplaceability of the original factory

Huaneng Haimen Power Plant, Guoneng Pingluo Power Plant: Application achievements of Steam extraction check valves

The core competitiveness of Viti: German technological genes + Russian core manufacturing + Chinese assembly and inspection + local services of the Asia-Pacific center, achieving the differentiated value of "technology benchmarking against imports and services close to the local market".

Summary

There is no "best" brand for imported power station valves, only the "most suitable" solution.

The core steps of scientific selection

First, clarify the working condition parameters: medium characteristics, temperature and pressure grades, flow range, closing pressure difference, and action time

Re-evaluate brand tiers and services: Based on the complexity of working conditions and budget, match among international first-tier, Chinese-funded technology-oriented, and leading domestic brands

Finally, verify performance and qualifications: Require suppliers to provide performance certificates of the same type of units and the same working conditions, and verify qualifications such as TSG

W&T, with German technology as its foundation, Russian manufacturing as its support, and Chinese delivery services as its guarantee, provides professional and reliable options for valve selection under the harsh working conditions of power stations. If you need technical support and selection suggestions, please feel free to contact the technical team of Viti Asia Pacific Center.