Ningbo Taojun Refrigeration Equipment Co., Ltd. is located in Xiangshan, Ningbo, a beautiful tourist city. Founded in 1988, its predecessor was Xiangshan Refrigeration Accessories Factory of Zhejiang University. The company's leading products include: filter driers, check valves, air conditioning valves, condensers, brass and copper accessories, air conditioning cable ties, and other refrigeration accessories series products.
After 30 years of hard work and rapid development, it has now become a comprehensive enterprise integrating the design and development, production, sales, and after-sales service of refrigeration accessories. In 2021, it became a national high-tech enterprise. Our company is committed to technological and process innovation, equipment improvement, and the introduction of advanced management concepts to produce first-class products.
"Customer satisfaction is our unwavering pursuit. With reasonable design, reliable quality, and perfect after-sales service, the 'Lingshan' filter has become a well-known brand in the domestic refrigeration industry."
In 2012, Ningbo Taojun Refrigeration Equipment Co., Ltd. was established, creating the brand "Taojun" condensers, "Taojun" stop valves, and other series of products. Over the years, it has established partnerships with well-known domestic and foreign home appliance enterprises such as Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui. The product sales network covers major and medium-sized cities in China and is exported to Europe, America, South America, Southeast Asia, the Middle East, Africa, and other overseas markets. The company's goal is to support and cooperate with every sincere customer to achieve a win-win situation.
Watch Taojun Manufacturing & Quality Control in Action
In modern commercial and industrial heat exchangers, the copper return bend (often termed the crossover bend or U-bend) acts as the critical conduit that redirects refrigerant flow between adjacent paths in a finned coil. The geometry of the return bend directly influences the internal fluid dynamics and pressure drop of the thermodynamic cycle. Taojun's optimized copper return bends are manufactured with precise, smooth inner profiles to minimize turbulence, thereby reducing compressor workload and optimizing overall seasonal energy efficiency ratios (SEER) in residential HVAC and large industrial refrigeration plants alike.
The global transition toward high-pressure refrigerants, such as R32, R410A, and natural refrigerants like CO2 (R744) and Propane (R290), has significantly raised the demands on structural integrity in piping networks. Return bends must withstand higher operating pressures without fatiguing. By utilizing deoxidized high phosphorus copper (C12200), Taojun provides the global market with return bends that exhibit outstanding brazing properties and high structural resistance, satisfying strict safety parameters across European, North American, and Asian industrial markets.
To prevent grain boundary defects and hydrogen embrittlement during brazing, the quality of raw copper tubing is paramount. Below are the design standards and technical parameters implemented by Taojun:
| Technical Parameter | Specification Standard | Engineered Benefit |
|---|---|---|
| Material Composition | C12200 Copper (Cu ≥ 99.9%, P: 0.015% - 0.040%) | Superior corrosion resistance & high thermal conductivity |
| Wall Thickness Tolerance | ±0.02 mm | Uniform heat distribution during automated brazing |
| Bending Angle Accuracy | ±0.5 degrees | Perfect alignment with condenser/evaporator tube sheets |
| Working Pressure Range | Up to 120 bar (designed for R744 transcritical systems) | Eliminates risk of catastrophic rupture at peak loads |
| Inside Cleanliness | < 0.025 g/m² residue (DIN 8964 compliant) | Prevents capillary tube blockage and expansion valve failure |
Our return bends and copper accessories are specifically designed to serve diverse structural demands:
Our core manufacturing processes are supported by precision bending, forming, and testing equipment imported directly from Germany, ensuring absolute dimensional consistency.
Our R&D center is staffed by 15 specialist engineers, including doctors and professors in heat transfer engineering from the University of Science and Technology of China.
We provide full customization for return bend radii, configuration angles, and leg extension lengths. Share your technical drawings, and we will bring your vision to life.
We import our process-critical materials, including premium copper stock and high-grade molecular sieves, directly from specialized Japanese and European manufacturers.
Comprehensive environmental thermal shock trials (10°C to 90°C), dry air purge processes, helium mass spectrometer leak detection, and high-voltage failure tests prevent in-field leaks.
Equipped with certifications including ISO 9001:2015, IATF 16949, RoHS, and UL, we confidently support the strict compliance requirements of the global HVAC/R supply chain.
Years of Refrigeration Expertise
Year of Establishment
Export Countries & Regions
Target Defect Rate Limit
A world brand is supported by a corporate culture. We fully understand that her corporate culture can only be formed through Impact, Infiltration, and Integration.
1998 - Original Factory Building
2008 - MES Workshop Integration
We demonstrate an uncompromising commitment to manufacturing precision and structural reliability. Our GB/T19001-2016/ISO9001:2015 certification (Registration No.: 41325Q00065R0S) validates our OEM & ODM supply capability for complex refrigeration circuits.
ISO9001 Main Document
Detailed Scope Document
EU RoHS Verification
UL Safety Listing Certificate
As environmental regulations (such as F-Gas in Europe and AIM Act in North America) mandate phase-downs of high-GWP (Global Warming Potential) HFCs, the refrigeration sector is turning toward natural alternatives. R290 (Propane) and R744 (Carbon Dioxide) are the leading technical paths. However, these systems work under distinct, challenging conditions:
Taojun