Explore our elite range of precision-manufactured tubes, accessories, and system optimization elements designed for high thermal integrity.
The HVAC/R (Heating, Ventilation, Air Conditioning, and Refrigeration) sector is undergoing a rapid transition toward ecological sustainability and high efficiency. Under this framework, Pancake Copper Tubes (primarily structured as annealed, seamless deoxidized high phosphorus (DHP) copper conforming to ASTM B280 / EN 12735-1 standard specifications) represent the lifeblood of refrigerant transmission loops. Because these tubes are deployed inside highly complex thermal systems, their grain size, wall thickness consistency, and internal cleanliness level are paramount.
Modern thermal engineering demands seamless copper tubing with absolute minimal interior residue—often under 0.038 g/m²—to prevent chemical reactions with new-generation eco-friendly refrigerants like R32, R410A, and R290 (Propane). The presence of oil, moisture, or particulate matter within the inner bore can catalyze compressor sludge build-up, acidify the system, and eventually cause catastrophic compressor burnout.
Furthermore, structural designs in modern air-conditioning evaporators require optimized heat-exchange surfaces. Manufacturers are turning to inner-grooved pancake copper tubes that exhibit micro-fin geometry. This internal structure increases the thermal heat transfer coefficient by up to 2.5 times compared to smooth bore tubes, reducing raw material usage while maintaining high thermodynamic efficiency.
Our pancake copper coils utilize high-purity C12200 Phosphorus-Deoxidized Copper (Cu ≥ 99.90%, P: 0.015% - 0.040%). This alloy offers superior thermal conductivity, exceptional weldability/brazability, and deep corrosion resistance against atmospheric and moisture-heavy HVAC operational settings.
Established in 1988 as the Xiangshan Refrigeration Accessories Factory of Zhejiang University, Ningbo Taojun Refrigeration Equipment Co., Ltd. (located in Xiangshan, Ningbo, China) has evolved into a global titan in the HVAC/R component manufacturing field. Now classified as a national High-Tech Enterprise, Taojun integrates R&D, precision manufacturing, strict quality inspection, and reliable logistics under one corporate umbrella.
Our core product portfolio includes: high-purity copper filter driers, check valves, air conditioning outdoor service valves, condensers, brass and copper accessories, and air conditioning cable ties. Under our renowned brand "Lingshan", our filter driers have captured a significant share of the domestic refrigeration supply chain and achieved massive recognition internationally.
Our operations are structured around global trust and international regulatory alignment. We have achieved and sustained certifications including:
Why global OEMs trust Taojun to execute high-tolerance production runs with flawless logistical synchronization.
We leverage German-imported cold drawing machinery, high-speed rotary bending systems, and automated annealing furnaces under protective nitrogen atmospheres. This prevents surface oxidation and preserves structural integrity.
Every copper component undergoes rigorous testing, including a 500-hour damp-heat cycle, ±0.02mm dimension screening, and helium leak testing to guarantee zero refrigerant escape pathways.
Our operations are run on an integrated Manufacturing Execution System (MES), enabling end-to-end traceablity from copper cathode melting to final packaging. Partnering with domestic giants like Haier, Midea, Gree, and global leaders such as Whirlpool and Electrolux, we ensure reliable delivery schedules.
From residential ductless minisplits to commercial heavy refrigeration setups, our components perform reliably in challenging climates.
Variable Refrigerant Flow systems rely on pancake copper tubes to link indoor units with outdoor heat exchangers. Our seamless construction and uniform grain structure resist high operating pressures (exceeding 4.15 MPa in R410A systems) without micro-crack propagation during mechanical tube expanding.
Industrial freezers and ice makers require complex, serpentine evaporator coils. Taojun's copper tubes are highly ductile, allowing for small-radius bends without collapsing or wrinkling. This keeps fluid flow smooth and refrigeration cycles running efficiently.
Medical refrigeration requires zero system contamination. By using double-sealed copper capillary tubes and 3A molecular sieve filter driers, our system traps trace moisture and prevents ice crystals from forming in the expansion valves, which could lead to system shutdown.
Over three decades of manufacturing upgrades and product expansions.
Founded as Xiangshan Refrigeration Accessories Factory of Zhejiang University, establishing our technical foundation in refrigeration metallurgy.
Expanded to a new dedicated factory building to meet growing demands for copper accessories and filter driers across China.
Integrated our Manufacturing Execution System (MES) for end-to-end quality tracking, earning ISO 9001 and UL safety certifications.
Formally established Ningbo Taojun Refrigeration Equipment Co., Ltd. and registered the "Taojun" brand for condensers and service valves.
Certified as a National High-Tech Enterprise. Partnered with the University of Science and Technology of China to expand our R&D team.
We support our partners with comprehensive pre-sales engineering reviews and dedicated lifetime technical assistance.
We work with global clients to supply certified refrigeration accessories that meet international safety standards.
Certification Document
Certification Scope
Find expert answers to common questions about copper tube metallurgy, system compatibility, and quality control standards.
High-durability accessories, brazing solutions, and system valves ready for international shipping.
Taojun