Explore our primary manufacturing line. Highly calibrated vacuum systems, brazing solutions, and high-precision flow control accessories.
In modern thermodynamics and cooling engineering, a refrigeration system's stability depends entirely on the integrity of its piping connections. The refrigeration tee serves as a critical junction point where refrigerant fluid splits or merges. Under volatile thermal loads, intense system vibration, and elevated pressures, standard copper tees are prone to micro-fissures, fatigue failure, and chemical degradation.
As environmental guidelines shift systems towards eco-friendly refrigerants like R32, R290, and subcritical CO2 (R744), working pressures have skyrocketed. To prevent leaks that accelerate Global Warming Potential (GWP) and compromise system performance, top tier refrigeration teams specify ASME B16.22 or EN 1254-1 compliant copper fittings. Understanding raw materials, manufacturing tolerances, and joint physics is crucial for system designers, HVAC distributors, and engineering contractors worldwide.
Tracing our origins from the Xiangshan Refrigeration Accessories Factory of Zhejiang University in 1988.
Established in 1988, Ningbo Taojun Refrigeration Equipment Co., Ltd. (branded globally as TAOJUN) was born out of a strategic research collaboration with the prestigious Zhejiang University. For over three decades, we have evolved into a national high-tech enterprise, integrating technical design, industrial-scale manufacturing, and after-sales customer engineering support.
Located in the coastal industrial hub of Ningbo, China, our advanced facility covers automated copper machining, vacuum system production, and testing labs. Our product portfolio includes: copper filter driers, check valves, custom equal & reducing tees, access valves, service valves, condensers, and brass accessories. Our mission is to engineer flow control solutions that safeguard systems from refrigerant leakage and internal contamination.
Our foundation lies in deep metallurgical and thermodynamic research. By teaming up with material science doctors and structural engineering professors, we ensure our tooling designs, alloy selections, and heat treatments match the physical limits of copper-phosphorus compounds.
High-precision cutting, extruding, and sizing machinery imported directly from Germany to enforce tolerance thresholds below ±0.02mm.
Featuring continuous thermal cycle chambers, helium leak mass spectrometers, and physical fatigue testing benches for structural validation.
Real-time production tracing systems matching operators, raw material heats, and testing records to every manufactured batch.
Why material density, wall thickness uniformity, and grain structure matter for long-term HVAC operation.
Refrigeration fittings are subjected to dynamic thermal stress. When the compressor cycles on, high-frequency vibrations run through the system, creating shear stresses at connection joints. Low-grade copper tees often fail due to structural wall variations, irregular annealing, or high oxide inclusions in the weld seam. Taojun address these failure modes through precise engineering specifications.
We source premium grade C12200 (TP2) Deoxidized High-Phosphorus Copper with a pure copper content of at least 99.9%. Phosphorus content is maintained between 0.015% and 0.040% to achieve excellent weldability, brazeability, and hydrogen embrittlement resistance. This exact metallurgy prevents internal scaling during brazing, preventing particulate debris from clogging capillary tubes or scoring scroll compressors.
| Parametric Dimension | ASME B16.22 Standard | TAOJUN Manufacturing Metric | Quality Advantage / Outcome |
|---|---|---|---|
| Material Composition | Copper Min 99.90% | 99.95% Pure TP2 (C12200) Copper | Enhanced electrical, thermal, and corrosion immunity. |
| Outer Diameter Tolerance | ±0.05 mm to ±0.10 mm | ±0.02 mm (CNC Extruded) | Optimal capillary action gap for seamless brazing connections. |
| Ultimate Burst Pressure | System specific (3x operating) | Over 120 Bar (1740 PSI) | Compatible with high-pressure R410a, R32, & subcritical CO2. |
| Hardness Range | Varies (O60, H55) | Optimized Half-Hard (HV 75-90) | Maintains roundness under bending; resists crushing. |
| Wall Thickness Uniformity | Min 90% concentricity | >97% Concentricity Control | Eliminates structural hot-spots and thermal wear zones. |
To establish a secure brazed connection, the space between the tube insert and the tee socket must remain within 0.05mm and 0.15mm. If this gap is too small, the brazing alloy cannot penetrate; if too large, the capillary draw fails, leading to voids in the joint. Taojun's automated extrusion lines produce sockets with accurate sizing to guarantee quick, reliable brazing operations in the factory and in the field.
How our copper tees conform to specific global climate zones, regional codes, and equipment demands.
Engineered to comply with ASTM B280 and UL 109 standards, our copper tees handle the heavy vibration and thermal expansion typical of large commercial Variable Refrigerant Flow installations across the US and Canada.
With Europe adopting natural refrigerants like R290 (propane), leak tightness is vital to prevent fire hazards. Our tees feature zero-porosity joints that prevent gas migration, ensuring compliance with EN 378 and CE directives.
Designed for harsh marine and coastal environments, our tees withstand salt spray corrosion and high humidity. Perfect for trawlers, processing facilities, and walk-in cold storage in the Asia-Pacific region.
Adapting to the future of thermal systems, eco-friendly refrigerants, and intelligent manufacturing.
The HVAC/R landscape is evolving rapidly due to decarbonization targets and efficiency regulations. To help our partners prepare, Taojun continues to innovate our technical processes:
Over the next two years, Taojun is expanding our automated MES workshop to link raw material melting data with physical pressure tests for every product batch. This digital record will be accessible via code scanners on each shipping crate, offering full transparency to international buyers.
Why global brands trust our high-volume, reliable production capabilities.
Operating a global HVAC/R brand or wholesale distribution company requires a highly dependable supply chain. A delay in the delivery of a simple copper fitting can halt container shipments or stall critical construction projects. Located in the Ningbo industrial zone, Taojun offers distinct supply chain advantages:
Our facility is situated close to raw copper refineries, high-purity brass suppliers, and specialized tooling workshops. This allows us to source raw materials quickly, insulating our production lines from unexpected market shortages.
We are only a short distance from Ningbo-Zhoushan Port, one of the world's busiest container hubs. This offers us daily shipping departures, lower local freight costs, and shorter shipping windows to North America, Europe, and the Middle East.
Whether you need a baseline production run of 500 units for specialized configurations or high-volume container supply, our flexible production schedules accommodate both without sacrificing quality.
We work closely with leading brands like Haier, Midea, Gree, Whirlpool, Electrolux, and Huarui. These long-term partnerships push us to refine our quality controls, reduce lead times, and optimize delivery performance. During high-demand seasons, our automated machinery runs 24/7, maintaining stable pricing and consistent lead times for our partners.
Rigorous lab testing, official certifications, and metallurgical tracking.
Quality is central to everything we build at Taojun. Every production run undergoes structural and metallurgical testing to confirm it meets international standard regulations. We maintain a GB/T19001-2016 / ISO 9001:2015 certification (Registration No.: 41325Q00065R0S), verifying our quality management controls from design through packaging.
Our products comply with the European RoHS (Restriction of Hazardous Substances) and REACH directives, ensuring our copper alloys and brazing fluxes contain no lead, mercury, or other restricted heavy metals. For the North American market, our copper and brass fittings carry UL certification, confirming they meet safety and pressure guidelines for high-pressure HVAC applications.
1. Chemical spectroscopy of incoming raw copper.
2. Sizing verification using CNC laser callipers.
3. Burst testing of sample joints up to 120 Bar.
4. Internal nitrogen purging to prevent oxide scaling.
5. Final optical sorting and packaging checks.
Explore our full line of refrigeration valves, copper bends, capacitors, and charging fittings.
Technical answers regarding metallurgy, standards compliance, ordering options, and installation parameters.
Taojun