Direct factory-sourced high-reliability components engineered for critical cooling, heat exchange, and pressure monitoring systems.
Ningbo Taojun Refrigeration Equipment Co., Ltd. is located in Xiangshan, Ningbo, a scenic and strategically situated port city in China. Founded in 1988, our factory's historical predecessor was the Xiangshan Refrigeration Accessories Factory of Zhejiang University. This academic foundation has fueled our technological trajectory for over three decades.
Today, Taojun is a national high-tech enterprise specializing in the integration of design, R&D, advanced manufacturing, and global sales of premium copper piping products, pancake coils, filter driers, check valves, air conditioning service valves, wire tube condensers, and custom brass refrigeration fittings. Our commitment to strict processing standards guarantees that we consistently deliver zero-defect, high-purity copper solutions that meet the rigid tolerances required by global appliance brands.
In modern industrial and commercial refrigeration, the transition to eco-friendly refrigerants—such as R32, R290 (propane), and CO₂ (R744)—has completely redefined system operating pressures and temperature ranges. System designs now demand extremely high pressure resistance. This makes the metallurgical composition and mechanical integrity of pancake copper tubing and fittings a primary factor in preventing refrigerant leakage and securing system safety.
Pure copper (typically C12200 Deoxidized High Phosphorus copper, with >99.9% Cu composition) remains the industry gold standard due to its excellent thermal conductivity, corrosion resistance, and workability. In pancake coils (wound in flat, double-layered configurations), uniform grain structure and precise wall thickness tolerances are vital to prevent cracking during onsite bending and brazing.
Moisture is the worst enemy of any cooling system. When water vapor enters a refrigeration line, it reacts with synthetic lubricant oils (like POE/PVE) to form hydrofluoric or hydrochloric acids. These acids attack the compressor motor windings, resulting in electrical burnouts, copper plating, and expansion valve failure.
This is where molecular sieve copper filter driers play a vital protective role. Utilizing high-capacity desiccant structures—specifically type 3A molecular sieves, which selectively adsorb water molecules while ignoring refrigerant molecules—these devices lower moisture content to safe levels (below 10 ppm). Additionally, incorporating active carbon components allows filter driers to capture oil-degradation sludge and acids, ensuring long-term system stability.
| ASTM Standard | Material Designation | Copper Content (Min %) | Common Applications | Compatible Refrigerants |
|---|---|---|---|---|
| ASTM B280 | C12200 (DHP) | 99.90% | HVAC Air Conditioning, Field Service Pancake Coils | R410A, R32, R134a, R290 |
| ASTM B88 | C12200 / C10200 | 99.90% / 99.95% | Water Lines, Industrial Plumbing Systems | Liquid Transport, Water cooling |
| EN 12735-1 | Cu-DHP | 99.90% | European Refrigeration Tubing & Connections | R290, R744 (CO₂), R407C |
| JIS H3300 | C1220T | 99.90% | Asian OEM Air Conditioner Heat Exchangers | R32, R410A, R134a |
A look inside our ISO 9001 certified manufacturing facility in Ningbo, showing our raw material handling, testing labs, and completed custom components.
Thirty-five years of dedicated refinement, building upon academic research to establish a world-class manufacturing facility.
Founded as the Xiangshan Refrigeration Accessories Factory of Zhejiang University, laying our scientific foundation in thermal dynamics and metallography.
Adopted international quality management systems, introducing specialized laboratory test environments and the MES intelligent workshop management system.
Established Ningbo Taojun Refrigeration Equipment Co., Ltd. and officially launched the "Taojun" brand for condensers, stop valves, and copper piping accessories. Solidified partnerships with household appliance leaders such as Haier, Midea, Gree, and Whirlpool.
Recognized as a national High-Tech Enterprise, passing EU RoHS environmental directives, REACH, and obtaining US UL certifications for critical products.
Expanded global operations to service over 50 countries, launching new high-pressure copper configurations optimized for environmentally friendly natural refrigerants.
We combine raw material purity control with advanced automated inspection to meet the standards of tier-one appliance manufacturers.
Our core production lines and tube drawing mills utilize advanced German machinery. This automation helps maintain tight dimensional tolerances (±0.02 mm) across long production runs.
With an active engineering center staffed by researchers from the University of Science and Technology of China (USTC), we hold multiple patents in flow mechanics and refrigeration filtration technology.
We perform high and low temperature tests at -35°C to 75°C for 500 hours, thermal shock cycling, and helium mass spectrometer leak detection. This rigorous testing helps us maintain a 0.05% defect rate limit.
Verifiable accreditation documents confirming compliance with global standards, guaranteeing safety for international distribution.
Main ISO 9001 Certificate
Detailed Scope of Certification
Our official quality standard compliance registration (Registration No.: 41325Q00065R0S) confirms our design and manufacturing capabilities for copper filter driers, condensers, and access valves. Verifiable under China's national authority CNCA (www.cnca.gov.cn) and verified with Zhongci International (www.zcgirz.com), it shows our commitment to high-standard manufacturing for global distributors.
Our manufacturing floor is supported by high-purity cleaning systems, automated tube cutting, and specialized verification labs.
Industrial Copper Drawing & Straightening
Semi-Automated Drier Assembly & Soldering
Quality Verification Laboratory
Our copper components are engineered for long service life across residential, commercial, and industrial refrigeration systems.
Clean internal copper surfaces and precise bends help optimize performance in split-system air conditioning units.
Large-capacity filter driers absorb moisture and filter particulates in supermarket display and cold storage systems.
Our specialized industrial drier cartridges help prevent freeze-ups in capillary tubes and expansion valves.
We supply compact receiver driers built to withstand the vibration and high pressure cycles of vehicle AC systems.
Answers to common technical questions from HVAC/R system designers, procurement officers, and engineering partners.
Pancake copper tubing (wound in double-layer flat coils) is preferred due to its convenience, ease of transport, and ease of bending. Because split-system installations require onsite routing and manual bending, annealed soft-temper copper allows technicians to shape connections without buckling or cracking. Keeping the internal surface clean and dry is critical to prevent moisture from contaminating the compressor oil.
Our copper filter driers utilize a high-density shell of deoxidized copper filled with molecular sieve desiccant beads. The molecular sieve pore openings (typically 3 Angstroms) selectively capture water molecules while allowing refrigerant molecules (like R32 or R134a) to pass through. This chemical structure helps maintain moisture levels below 10 ppm, which protects the compressor from corrosion and acid formation.
We perform pressure testing, thermal shock testing, and helium mass spectrometer leak detection on our refrigeration fittings, service valves, and filter driers. Our standard testing protocols subject products to high and low temperatures from -35°C to 75°C for 500 hours to verify joint integrity before shipping.
Yes, all Taojun copper components, brass fittings, and filter driers are fully certified under EU RoHS directive 2011/65/EU and REACH regulations. This compliance certifies that our alloys do not contain hazardous concentrations of lead, mercury, hexavalent chromium, or PBB/PBDE flame retardants.
Our typical OEM lead times range from 15 to 30 days depending on volume and customization. Pancake coils are capped, nitrogen-purged, vacuum shrink-wrapped, and packed in reinforced double-wall corrugated cartons on fumigated pallets to protect against physical damage and humidity during transit.
Yes, our engineering center provides full OEM and ODM services. We manufacture customized lengths, varying wall thicknesses, internal grooved structures for enhanced heat transfer, and custom end configurations (such as spun ends, flared fittings, or copper-to-aluminum transitions) based on client technical drawings.
Supported by a values-driven corporate culture focusing on Honesty, Innovation, Responsibility, and Cooperation.
A global brand relies on a strong corporate culture. We focus on integrating quality processes and research to support our partners. By sharing resources and leveraging engineering expertise, we work to build long-term relationships with international OEMs.
Our sales and logistics network supports major regions throughout China, Europe, North America, South America, Southeast Asia, the Middle East, and Africa. We offer dedicated technical training, troubleshooting support, and a responsive feedback process for our customers.
Explore our full line of copper filter driers, condenser coils, service valves, and custom connection kits.
Taojun
