The Rise of Domestic Servo Hydraulic Valves: Qingdao Beizhong Leads, Realizing the Replacement of MOOG and American Lee Valves in the Aviation and Power Sectors
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2025-12-31
Rise of Domestic Servo Hydraulic Valves: Qingdao Beizhong Leads the Way, Realizing Replacement of MOOG and US Lee Valves in Aviation and Power Sectors
As the "core hub" of hydraulic control systems for high-end equipment, servo hydraulic valves directly determine the control accuracy, response speed, and operational reliability of equipment. For a long time, the high-end servo hydraulic valve market in critical fields such as aviation and power has been monopolized by international giants like MOOG and US Lee, leaving core technologies and product supply dependent on external sources. In recent years, domestic enterprises represented by Qingdao Beizhong Equipment Technology Co., Ltd., in collaboration with scientific research institutes, have continuously tackled key technical challenges, achieving breakthroughs in the R&D and manufacturing of servo hydraulic valves. They have launched a full range of products, including 30/31/35 series low-flow valves and 72 series mechanical feedback servo valves. These domestic valves have achieved precise matching with MOOG's 260, 261 series and US Lee's SDBB, SDBX series in key indicators such as performance parameters, environmental adaptability, and reliability. Successfully replacing imported products in aerospace, power energy, and other fields, they have broken foreign technological monopolies and advanced the process of independent control over core components of China's high-end equipment.
I. Technological Cornerstone of Domestic Replacement: Core Technological Breakthroughs Led by Domestic Enterprises
With years of dedication to the servo hydraulic valve sector, Qingdao Beizhong Equipment Technology Co., Ltd. has established a comprehensive product system covering low-flow, medium-flow, and high-flow servo hydraulic valves through the "industry-university-research-application" integration model, in partnership with research institutes and aerospace academies. Its product portfolio not only includes basic valve types such as the 30/31/35 series (low-flow) and 62 series (low-flow) but also high-performance mechanical feedback servo valves like the 72/072 series and 78/079 series, as well as specialized servo valves such as the G761/G792 series and J761 series. This enables full alignment with mainstream products from MOOG and US Lee.
At the core technology level, Qingdao Beizhong has mastered high-precision valve port machining technology, controlling valve port tolerances within ±0.001mm to ensure precise flow control. Adopting special high-temperature-resistant and corrosion-resistant alloy materials, its products operate within a temperature range of -55℃ to +150℃, adapting to extreme working conditions in aviation and power sectors. Integrating independently developed digital closed-loop control algorithms has significantly enhanced dynamic response speed and anti-interference capabilities. Meanwhile, other renowned domestic enterprises such as Shanghai Hengtuo Hydraulic and Wuhan Haizhuo Taike have made simultaneous strides in jet pipe servo valves and direct-drive servo valves, forming technical complementarity and collectively building a technological barrier for domestic servo hydraulic valves. These breakthroughs lay a solid foundation for replacing international brands like MOOG and US Lee.
II. Aviation Sector: Precise Replacement of MOOG and US Lee Valves, Ensuring Equipment Independence
The aviation sector imposes extremely stringent requirements on the safety, reliability, and dynamic response of servo hydraulic valves. MOOG's aerospace-specific servo valves (e.g., MOOG 260, 261, 262, 265, E024) and US Lee's micro solenoid valves (e.g., SDBB2131013A, SDBB2131012A) have long dominated the market. Today, products from Qingdao Beizhong and other domestic enterprises have achieved precise replacement of these imported valves, widely used in core systems such as aircraft flight control, engine control, and electromechanical systems.
(I) Domestic Replacement of MOOG Aerospace-Specific Servo Valves
In the actuator control loops of aircraft flight control systems, MOOG 260 and 261 series servo valves have long served as core components due to their high-frequency response and high-precision control. Qingdao Beizhong's 72/072 series mechanical feedback servo valves (e.g., 072-1102-6, 072-558A, 072-559A, 72-559A) have realized direct replacement of these MOOG valves. Featuring a precision mechanical feedback structure, these domestic valves boast a hysteresis of ≤0.5%FS, a bandwidth of ≥120Hz, and a control accuracy of ±0.05%FS, fully matching the performance parameters of MOOG 260 and 261 series. In the aileron control loop of a regional jet, the 072-559A valve successfully replaced the MOOG 261 valve. After thousands of flight tests, its operational stability under high vibration and wide temperature range conditions is comparable to that of imported valves, with a Mean Time Between Failures (MTBF) exceeding 5,000 hours—surpassing the 4,000-hour standard of imported products.
For MOOG 262 and 265 series high-flow servo valves, Qingdao Beizhong's 78/079 series mechanical feedback servo valves (e.g., 79-100/200 series, 79F183C2-HP5, D079-281, 078-136D, 079-190C2) provide effective alternatives. The 79F183C2-HP5 model, with a maximum flow rate of 100L/min and operating pressure of ≤31.5MPa, is suitable for high-load control loops such as elevators and rudders in main flight control systems. Its performance fully covers the MOOG 265 series, with enhanced contamination resistance—capable of withstanding 20μm particles without jamming, significantly improving hydraulic system maintenance convenience.
In extreme working conditions such as fuel metering and vane control of aero-engines, MOOG 265 and E024 series servo valves are widely used for their high-temperature resistance and gas erosion resistance. Qingdao Beizhong, in collaboration with a research institute, has developed aerospace-specific servo valves (e.g., J072-055, J079B196, J761-001A, J761-002A) that successfully replace these imported valves. Adopting special ceramic coating technology, these domestic valves can withstand temperatures up to 150℃ with improved gas erosion resistance. In the vector nozzle control of a certain aero-engine, the J761-003A valve replaced the MOOG E024 valve, achieving precise nozzle attitude adjustment with a fuel control error of ≤0.3%, ensuring stable engine thrust output. Additionally, Qingdao Beizhong's D661 series servo valves (e.g., D661-1933E, D661-4033, D661-4049) have replaced MOOG's equivalent series, widely used in afterburner control loops of aero-engines. Their digital control modules can directly interface with aircraft fly-by-wire systems, offering enhanced compatibility and adaptability.
(II) Domestic Replacement of US Lee Micro Solenoid Valves
US Lee's SDBB series (e.g., SDBB2131013A normally closed, SDBB2131012A normally open, SDBB2131113A) and SDBX series (e.g., SDBX0571400B, SDBX0571350B) micro solenoid valves are widely used in small control loops of aircraft, such as hydraulic auxiliary systems, fuel delivery control, and environmental control systems, due to their compact size, fast response, and high reliability. Qingdao Beizhong's 30/31/35 series (low-flow) and 62 series (low-flow) servo valves, featuring lightweight and miniaturized designs, have achieved precise replacement of these Lee valves.
For example, the 31 series low-flow servo valve, with a volume of only 18×12×8mm (equivalent to US Lee's SDBB2131013A), offers a response time of ≤5ms and an operating pressure range of 0.5～21MPa, fully matching Lee's performance parameters. In the cabin pressure control loop of a certain aircraft, the 31 series low-flow valve replaced the SDBB2131012A normally open valve, achieving precise control of pressure regulating valves with pressure fluctuations within ±0.01MPa—outperforming imported products in operational stability. Furthermore, the 35 series low-flow valve optimizes the sealing structure with fluororubber seals, enhancing oil resistance and high-temperature resistance. It has successfully replaced the SDBX0571400B valve in small fuel delivery control loops of aircraft, ensuring continuous and safe fuel supply.
III. Power Sector: Replacing MOOG Core Valves, Empowering Energy Equipment Upgrading
In the power sector, MOOG's D661, D662, and D761 series servo valves are widely used in core systems of power generation units, such as speed control, excitation, and flue gas desulfurization systems. Their performance directly determines the operational efficiency and stability of power units. Series servo hydraulic valves from Qingdao Beizhong and other domestic enterprises have achieved full replacement of these imported valves, being widely applied in thermal power, hydropower, and new energy power generation, driving the domestic upgrading of power equipment.
In the speed control systems of thermal power generation units, MOOG D661 series servo valves (e.g., D661-4054/4055, D661-4436, D661-4506C) are core control components responsible for regulating turbine steam intake to ensure stable unit speed. Qingdao Beizhong's D661 series servo valves (e.g., D661-1933E, D661-4033, D661-4640) have realized direct replacement of these imported valves. Adopting electrical feedback closed-loop control, these domestic valves achieve a control accuracy of ±0.03%FS and a speed regulation error of ≤0.1%, fully meeting the high-precision control requirements of power generation units. In a 300MW thermal power project, Qingdao Beizhong's D661-4539C servo valve replaced the MOOG D661-4506C valve in the turbine speed control system, improving unit operational efficiency by 1.2% and saving over 1,000 tons of standard coal annually. Additionally, the delivery cycle is shortened from 3 months (imported) to 1 month, significantly reducing project operation and maintenance costs.
For the turbine control loops of hydropower generation units, MOOG D662/D679 series servo valves (e.g., D662Z4334K, D663-4007, D678/D679 series) are widely adopted for their strong contamination resistance and wide load adaptability. Qingdao Beizhong's D662/D679 series servo valves (e.g., D662Z4334K, D663-4007, D664-4010) have achieved precise replacement of these imported valves. The D663-4007 model optimizes valve port flow characteristics with a jet pipe pilot stage structure, enhancing contamination resistance to withstand 50μm particles. In the turbine control system of a large hydropower station, it successfully replaced the MOOG D663-4007 valve, achieving an operational lifespan of over 8,000 hours—surpassing the 6,000-hour standard of imported valves and significantly reducing maintenance frequency and costs for the hydropower station.
In the new energy power generation sector, wind turbine pitch control systems demand servo valves with lightweight and harsh environment resistance. MOOG G761/G792 series servo valves (e.g., G761-3001B, G761-3003B, G772 series) are the mainstream choice. Qingdao Beizhong's G761/G792 series servo valves (e.g., G761-3001B, G761-3006B, G765-1019-5) have realized replacement of these imported valves. Featuring high-strength aluminum alloy casings, these domestic valves are 30% lighter and optimized for sandstorm and low-temperature resistance, operating within a temperature range of -40℃ to +85℃. In a large wind farm in northwest China, the G761-3003B valve replaced the MOOG G761-3003B valve in the pitch control system of 1.5MW wind turbines. After over two years of operational testing, the failure rate was only 0.5%—lower than the 1.2% of imported valves—providing reliable support for the stable operation of the wind farm. Additionally, Qingdao Beizhong's 633/635 series servo valves (e.g., D633-303B/308B, D634-341C, D635-671E) are applied in flue gas desulfurization and denitrification systems of power plants, successfully replacing MOOG's equivalent series. They achieve precise control of desulfurization slurry flow, with a desulfurization efficiency of over 98%, helping power enterprises meet environmental standards.
IV. Core Advantages and Support System of Domestic Replacement
The successful replacement of MOOG and US Lee products by Qingdao Beizhong and other domestic enterprises' servo hydraulic valves stems not only from core technological breakthroughs but also from comprehensive advantages in performance, cost, supply chain, and after-sales service. In terms of performance, key indicators (control accuracy, response speed, reliability) of domestic servo valves have reached or exceeded those of imported products, with some products optimized for actual working conditions of domestic equipment, offering stronger adaptability. In terms of cost, domestic valves are priced at 60%～80% of imported products, with a delivery cycle of 1～2 months—far shorter than the 3～6 months of imported products—significantly reducing procurement costs and inventory pressure for equipment manufacturers. In terms of supply chain, domestic valves achieve 100% localization of core components, independent of international geopolitical influences, ensuring supply chain safety and stability. In terms of after-sales service, domestic enterprises provide 24/7 technical support and rapid maintenance services, with a maintenance response time of ≤24 hours—outperforming the 72+ hours of international brands.
To further ensure replacement reliability, Qingdao Beizhong has established a comprehensive quality control system. Products undergo rigorous environmental testing, life testing, and reliability testing to meet the stringent standards of the aviation and power sectors. Meanwhile, domestic enterprises have established long-term cooperative relationships with core equipment manufacturers in the power and aviation sectors, conducting joint R&D and testing to continuously optimize product performance based on actual equipment needs, forming a virtuous cycle of "R&D—production—application—iteration."
V. Conclusion and Outlook
Through continuous technological innovation and solid industrial accumulation, Qingdao Beizhong Equipment Technology Co., Ltd. and other renowned domestic enterprises have achieved a leap from "following" to "keeping pace" and even "leading" in the servo hydraulic valve sector. Their products, such as the 30/31/35 series low-flow valves, 72 series mechanical feedback servo valves, and D661 series servo valves, have successfully replaced core models of MOOG's 260, 261, 262 series and US Lee's SDBB, SDBX series in the aviation and power sectors. Breaking foreign technological monopolies, they have ensured the independent control of China's high-end equipment. The rise of domestic servo hydraulic valves not only enhances the core competitiveness of China's critical sectors such as aviation and power but also injects strong momentum into the transformation and upgrading of China's high-end equipment manufacturing industry.
In the future, with the in-depth integration of digital technology and intelligent control technology, Qingdao Beizhong and other domestic enterprises will continue to promote the intelligent upgrading of servo hydraulic valves, developing intelligent servo valves with condition monitoring, fault early warning, and remote operation and maintenance functions to further improve product performance and added value. Meanwhile, domestic servo hydraulic valves will expand into more high-end fields such as aerospace, marine, and ordnance, realizing full replacement of international renowned brands and helping China transition from a "manufacturing power" to a "manufacturing powerhouse."