Explore our industrial-grade components designed to guarantee leak-free operation, optimum heat transfer, and system integrity.
Ningbo Taojun Refrigeration Equipment Co., Ltd. is located in Xiangshan, Ningbo, a scenic coastal city known as a hub for advanced manufacturing. Founded in 1988, our predecessor was the Xiangshan Refrigeration Accessories Factory of Zhejiang University. This rich academic foundation drives our commitment to engineering perfection and technological innovation.
For over 30 years, we have designed, manufactured, and distributed refrigeration accessories globally. Recognized as a national high-tech enterprise in 2021, we manufacture high-performance filter driers, check valves, AC service valves, condensers, and premium brass/copper fittings under our domestic leading brand "Lingshan".
Our manufacturing conforms to stringent international standards, holding certifications for ISO9001:2015, EU RoHS, and US UL. We partner with tier-one global brands including Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui.
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Discover our smart manufacturing facility in Zhejiang, China. Our production lines feature state-of-the-art automated machinery, including helium mass spectrometer leak detection and CNC centers.
In 2012, we expanded our product line to launch "Taojun" condensers and L-bend stop valves. Our factory relies on a data-driven MES system to manage batch tracing and inventory efficiency, ensuring reliable quality control for international OEMs.
Why split service valves determine the efficiency, environmental safety, and operating life of modern HVAC systems.
The split service valve serves as the physical barrier separating the indoor unit from the outdoor compressor unit during installation, maintenance, and charging. Our L-bend stop valves utilize an engineered brass body paired with high-purity TP2 copper connection tubes.
By using hot-forged brass (such as HPb59-1 or lead-free brass formulations), we achieve uniform density that prevents gas micro-permeation. This is critical for systems utilizing high-pressure refrigerants like R410A and R32, which operate at pressures exceeding 4.0 MPa.
Refrigerant emissions are a major driver of GWP (Global Warming Potential). Ningbo Taojun implements a triple-seal system:
Our engineering ensures split service valves perform in diverse, challenging environmental conditions globally.
Salt spray is highly corrosive to refrigeration valves, leading to premature copper-brass galvanic corrosion. Ningbo Taojun split valves utilize proprietary surface passivation and plating technologies, resisting up to 500 hours of neutral salt spray testing. Perfect for coastal cities and marine HVAC units.
In regions such as Northern Europe and North America, outdoor heat pump units operate in ambient temperatures below -30°C. Standard valve seals can embrittle and fail. We utilize specialized low-temperature elastomers that maintain elasticity and sealing integrity at temperatures as low as -45°C.
Middle Eastern and tropical climates demand robust thermal resilience. Standard cooling valves face degradation of sealing lubricants. Our valves are rated for continuous service temperatures up to +120°C, ensuring bubble-tight shutoff even under intense solar exposure and high operating pressures.
The global HVAC industry is undergoing rapid changes driven by environmental regulations and electrification. Ningbo Taojun's R&D department, in partnership with top academic research institutions, is pioneering developments across three primary fronts:
A statistical overview of our manufacturing output, quality metrics, and global logistics reach.
Ningbo is one of the world's largest deep-water port cities, offering critical logistical advantages for global shipping. Over decades, a comprehensive industrial HVAC cluster has formed in Zhejiang. This proximity allows Taojun to source certified brass, copper, and sealing elastomers within a 50-mile radius, insulating our manufacturing from global raw material shocks.
Our integrated logistics setup guarantees flexible shipping schedules. We support FOB, CIF, and DDP terms, delivering products safely to Europe, North America, South America, and the Middle East.
Standard orders process rapidly. OEM customization drawings are delivered within 48 hours, prototypes within 7 days, and standard batch orders ship within 21 to 30 days direct from Ningbo Port.
We implement a strict quality management system to ensure every refrigeration valve meets regulatory standards.
Our quality verification processes check parts through every step of manufacturing:
From a small engineering workshop in 1988 to a global HVAC components manufacturer.
Established as Xiangshan Refrigeration Accessories Factory, partnered with Zhejiang University. Focused on domestic filter drier production.
Implemented MES intelligent workshop management system, optimizing process control and tracking from material intake to final assembly.
Upgraded to automated CNC cells and high-sensitivity helium leak detection systems. Serving tier-1 HVAC OEMs globally.
Ningbo Taojun's corporate growth is driven by four core values: Honesty, Innovation, Responsibility, and Cooperation.
Honesty: We ensure absolute transparency with our clients, providing verified testing certificates and trace documents. Innovation: We continually improve concepts, mechanisms, and manufacturing technologies. Responsibility: We stand behind our work, offering a full one-year warranty and lifetime engineering support. Cooperation: We collaborate with partners to build long-term, mutually beneficial relationships.
Our components are found globally across residential air conditioners, commercial chillers, mobile refrigeration units, heat pumps, and cold chain distribution systems.
In-depth technical answers addressing B2B engineering and procurement requirements.
We construct our service valves utilizing HPb59-1 forged brass alloy (or C3771 equivalent) for the main body. The connection tubes are extruded from TP2 copper (99.9% purity), ensuring excellent brazing properties. To prevent galvanic corrosion at the copper-brass junction under humid conditions, we apply an advanced post-machining passivation layer. This creates a uniform oxide film, preventing galvanic cells from forming in high-humidity or coastal environments.
R32 operates at pressures roughly 1.6 times higher than R22, while R290 (propane) requires strict spark-free, leak-tight sealing due to its flammability. We have optimized our stem sealing geometry by incorporating a dual-ring layout. The primary seal is a compression-molded HNBR O-ring designed to resist synthetic oils (POE/PAG). The secondary barrier is a PTFE gasket, offering low friction and high temperature resistance. This dual barrier ensures sealing integrity up to 6.0 MPa, keeping leak rates below 1x10⁻⁷ mbar·l/s.
For copper-to-copper brazing, we recommend using a silver-copper brazing alloy (such as 5% to 15% silver brazing rods) and purging the valve body interior with nitrogen to prevent internal oxidation. To protect the inner elastomer seals from heat degradation, wrap the valve body with a wet cloth, keeping temperatures below 120°C. For port bonnet installation, standard torque limits are: 1/4-inch port (14-18 N·m) and 5/8-inch port (50-60 N·m).
We provide full design flexibility. Custom port connections (e.g., metric sizes, flare fitments, or solder configurations), unique L-bend angles, and non-standard body geometries can be designed by our engineering team. We accept digital files in DWG, STEP, or IGES formats. Our R&D team can produce custom validation drawings within 48 hours and functional prototypes within 7 days using modern precision CNC machinery.
Our copper filter driers use high-purity copper shells packed with a blend of 3A molecular sieves and activated alumina cores. The 3A molecular sieve selectively traps water molecules while leaving refrigerant molecules unaffected, achieving a moisture absorption capacity of ≥20% of its dry weight. The activated alumina core neutralizes organic acids generated by oil degradation, protecting the compressor motor winding from corrosion.
We provide comprehensive engineering, logistics, and technical support throughout the product lifecycle.
Select from our range of auxiliary components to build a complete, high-performance cooling circuit.
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