Engineered for durability, maximum thermal efficiency, and zero-defect performance in international markets.
How Ningbo Taojun Refrigeration fuses scientific research with industrial precision to manufacture the world's most reliable capillary copper systems.
Established in 1988 as the Xiangshan Refrigeration Accessories Factory of Zhejiang University, Ningbo Taojun Refrigeration Equipment Co., Ltd. (now based in the scenic coastal city of Ningbo, Xiangshan) has spent more than 35 years refining thermal fluid management systems. What began as an academic collaboration has scaled into a leading global OEM/ODM manufacturer specializing in high-performance capillary copper tubes, copper filter driers, check valves, and condensers.
Our mission has always been anchored in pushing technical boundaries. By incorporating professional material science methodologies and leveraging our close collaboration with prestigious domestic research institutions, including the University of Science and Technology of China (USTC), we design refrigeration elements that consistently satisfy global benchmarks. Today, Taojun is officially recognized as a National High-Tech Enterprise, serving as an indispensable supplier for tier-one global brands like Haier, Midea, Gree, Whirlpool, and Electrolux.
Through constant technological iterations, our "Lingshan" filter drier series and "Taojun" refrigeration valves have set quality benchmarks across local and international markets. Our advanced production complex features a comprehensive MES intelligent workshop management system, safeguarding data-backed traceability and processing consistency from the raw material stage down to dispatch.
A deep breakdown of the physics, metallurgy, and inspection protocols that define Taojun's copper systems.
In a standard vapor-compression refrigeration system, the capillary tube acts as a fixed throttle device. The thermodynamic efficiency (COP) is highly dependent on the flow rate of the refrigerant, which is controlled by the tube's internal bore diameter ($D$) and length ($L$). According to fluid dynamic principles, the pressure drop across a capillary tube varies inversely with the fifth power of the internal diameter ($1/D^5$).
Even a minor variance of 0.02 mm in the capillary bore can alter refrigerant mass flow by up to 15%, leading to compressor flooding, liquid slugging, or evaporator starvation. Taojun addresses this challenge by employing strict dimensional controls, drawing high-purity C12200 phosphorus-deoxidized copper tubing to exact parameters.
As a National High-Tech enterprise, Taojun integrates advancements from its sister divisions. For instance, our specialized engineering team implements surface coatings derived from our advanced ITO film and liquid crystal spacer research. This provides outstanding thermal shock resistance up to 90°C and protects external connections from environmental corrosion, ensuring a 10+ year service life even in highly corrosive marine or industrial settings.
Why global OEMs partner with us for secure, scalable, and optimized refrigeration components.
Aligning with the rigorous quality systems, supply chains, and regulatory standards of global markets.
Based in Ningbo, Zhejiang province, Ningbo Taojun enjoys proximity to the Ningbo-Zhoushan Port—one of the largest deep-water ports globally. This geographical advantage translates to streamlined logistics, shorter transit times, and lower shipping costs for overseas buyers. Our proximity to domestic raw material supply chains ensures a steady intake of LME-registered copper cathodes, shielding our clients from severe raw material pricing volatility and ensuring reliable delivery.
Compliance is a cornerstone of modern industrial manufacturing. Our production lines are certified under the GB/T19001-2016 / ISO 9001:2015 quality management framework (Registration No.: 41325Q00065R0S), verified via China's CNCA database. Additionally, our materials comply with the European Union RoHS environmental directive and carry US UL certification for electrical and high-pressure components.
To assist system designers in specifying copper capillary tubes and filter driers, our engineering department provides the following baseline parameters:
| Parameter | Industrial Standard Range | Taojun Precise Grade | Primary Testing Metric |
|---|---|---|---|
| Material Composition | ≥ 99.9% Cu (C12200) | ≥ 99.95% Deoxidized Copper | Spectral Analysis / ASTM B280 |
| Inner Diameter Range | 0.50 mm to 3.00 mm | Customized (±0.02 mm tolerance) | Air-flow pressure testing |
| Tensile Strength | 200 MPa - 250 MPa | ≥ 230 MPa (Optimal Weldability) | Universal Tensile Tester |
| Cleanliness (Residue Limit) | ≤ 0.038 g/m² | ≤ 0.015 g/m² (Super-clean series) | Solvent Extraction / Gravimetric method |
| Burst Pressure Rating | Up to 80 Bar | ≥ 120 Bar (Suited for CO2/R744) | Hydrostatic Pressure Test |
As the global HVAC/R market transitions away from high-GWP (Global Warming Potential) HFCs toward natural alternatives such as R290 (Propane), R600a (Isobutane), and R744 (CO₂), the requirements for system cleanliness and component pressure tolerances are increasing. Natural refrigerants have a high affinity for residual paraffin oils left behind during tube drawing processes. If the capillary interior is not thoroughly cleaned, chemical breakdown products can accumulate at the expansion point, leading to partial restriction.
Taojun addresses this by utilizing multi-stage ultrasonic degreasing systems and high-temperature vacuum drying, keeping residual oil levels far below traditional industry allowances. Our filters are designed to capture both moisture and traces of carbon, protecting systems from chemical wear.
Providing reliable performance across residential, commercial, and industrial thermal control systems.
Domestic Fridges
Commercial Freezers
Split AC Systems
Automotive HVAC
Industrial Chillers
Commercial Ice Makers
Beverage Dispensers
Transport Cooling
Geothermal Pumps
Cryogenic Cabinets
Providing technical support at every step of your project's lifecycle.
Our design engineers review customer requirements to select the correct capillary tubing diameter, length, and molecular sieve volume, helping to optimize system parameters before production begins.
We assist clients with installation configurations, brazing guidelines to prevent capillary blockage, and vacuum evacuation techniques.
We offer access to our testing laboratories, allowing clients to run mock lifecycle simulations and verify burst limits for specific projects.
A look inside our ISO 9001 certified labs and production floors.
Digital control panels & automatic tooling.
Continuous extrusion, welding, and sizing.
Environmental simulation & leak testing.
Answers to technical, regulatory, and procurement questions regarding our refrigeration components.
Browse our selection of filter driers, copper pipes, and system control components.
Taojun
