Explore our engineering grade selection of refrigeration filters, valves, and copper fittings designed for maximum system lifetime protection.
In high-pressure HVAC/R systems, moisture, acids, and solid impurities represent the primary threats to compressor integrity and energy efficiency. The presence of even a few parts per million (ppm) of water can react with synthetic POE (Polyolester) or PVE (Polyvinyl Ether) oils, triggering hydrolysis and generating corrosive organic acids. These acids attack motor windings, accelerate valve wear, and induce copper plating on critical bearing surfaces.
As a leading Wholesale Top Filter Line Dryer Supplier, Ningbo Taojun Refrigeration Equipment Co., Ltd. designs and manufactures premium copper and brass line driers that utilize a multi-stage adsorption matrix. By combining 3A molecular sieve desiccants (with pore diameters precisely matching ≤3 Ångströms to prevent co-adsorption of R32, R410A, or HFO refrigerants) and highly porous carbon matrices, our components achieve maximum water capacity while maintaining minimal pressure drop.
In precision refrigeration component design since 1988.
Achieved through MES automation and helium leak testing.
Utilizing superior quality 3A molecular sieve matrices.
Trusted by global brands like Haier, Midea, and Whirlpool.
Founded in 1988, our predecessor was the Xiangshan Refrigeration Accessories Factory of Zhejiang University. Today, Ningbo Taojun has evolved into a national high-tech enterprise (certified in 2021) integrating industrial design, advanced manufacturing, and global supply chains.
Operating out of a modern facility in Ningbo, China, we produce premium copper filter driers, check valves, air conditioning access valves, condensers, and high-purity copper fittings. Our proprietary domestic brand "Lingshan" is synonymous with leak-free reliability, backed by ISO 9001:2015, IATF 16949, EU RoHS, US UL, and REACH compliance.
Collaboration with top researchers from Zhejiang University and the University of Science and Technology of China keeps our material sciences at the cutting edge.
Our core manufacturing machinery is imported from Germany. Core raw materials, including high-purity copper and specialty films, are sourced directly from elite partners in Japan and Europe.
Every production batch undergoes comprehensive validation: 500-hour thermal shock tests (75°C to -35°C), 100V electrical isolation checks, and high-pressure dry ovens.
TAOJUN copper filter driers are designed to absorb moisture and acid, and to filter out particulate impurities. They are installed as crucial protective components during initial manufacture and replaced as critical repair parts for domestic and commercial refrigerators, freezers, and air conditioners.
| Working Pressure: | Up to 4.5 MPa (650 PSI) |
| Refrigerants: | R134a, R600a, R290, R32, R410A |
| Shell Thickness: | 0.8mm - 1.2mm |
| Dehydration Efficiency: | Removes water down to <10 ppm |
| Core Volume: | Customizable 10g, 15g, 20g, up to 100g |
Refrigeration systems face diverse environment stresses worldwide. Ningbo Taojun designs customized copper filter driers tailored to specific regional markets and thermodynamic demands:
High-pressure air conditioners and heat pumps operating on R410A and R32 require line driers that withstand up to 650 PSI continuous pressure. We supply thick-walled copper filter driers certified by Underwriters Laboratories (UL) that pass rigorous hydrostatic burst pressure testing.
European regulations strictly limit F-Gas emissions, driving the adoption of natural hydrocarbons like R600a (Isobutane) and R290 (Propane). Taojun has engineered specialized lightweight aluminum and low-volume copper filter driers to accommodate micro-charge limits without compromising dehydration performance.
In hyper-arid regions with summer ambient temperatures exceeding 50°C, compressors experience high thermal loads. Taojun’s thermal shock resistant filter cores ensure that water remains trapped within the molecular sieve matrix, preventing desorption at high condensing temperatures.
To maintain our leadership as a top manufacturer, Ningbo Taojun invests over 5% of annual revenues into thermodynamic research. Our engineering department, in collaboration with national universities, is advancing the next generation of filter line driers:
Development of inline line driers featuring digital colorimetric indicators and RFID chips to monitor moisture saturation levels in real-time, preventing compressor failures before they occur.
Transitioning toward 100% lead-free brass formulations and high-recyclability copper alloys, preempting future European chemical restrictions and lowering carbon footprints.
Merging the liquid receiver and molecular filter into a single coaxial thermodynamic unit, reducing material usage, system weight, and overall refrigeration charge volume.
Operating in Ningbo’s industrial manufacturing cluster gives Taojun unmatched access to raw materials and logistics resources. We leverage this structural advantage to guarantee cost stability, material traceablity, and high-speed global shipping.
Implemented in 2008 and continuously upgraded, our Manufacturing Execution System (MES) maps the journey of every copper tube from raw ingot to final vacuum packaging. This digital thread ensures 100% compliance with ISO 9001 and IATF 16949 audit requirements.
We source our copper directly from high-purity smelters in China. Additionally, our key desiccant materials and high-precision temperature-resistant films are imported from trusted manufacturers in Japan, insulation is maintained to survive >500 hours aging tests.
Located adjacent to Ningbo Port—one of the world's busiest container hubs—we execute customized shipping plans within 72 hours for in-stock orders, backed by professional customs clearing support for EU, US, and Southeast Asian markets.
2024 Factory Floor
1998 Factory Building
2008 MES Implementation
R&D Center Engineers
Corporate Culture Forum
Our quality policy revolves around our corporate values: Honesty, Innovation, Responsibility, and Cooperation. This commitment is supported by verifiable international certificates.
Our design, production, and after-sales support systems are officially registered under Registration No.: 41325Q00065R0S. The scope covers the design and production of filter driers, condensers, and access valves. All certificates are fully verifiable via the Certification and Accreditation Administration of China (CNCA) website (www.cnca.gov.cn).
We maintain Pre-sales Support with a dedicated team of engineers who have over 15 years of pump and refrigeration experience, responding to technical queries within 8 hours.
ISO 9001 Main Cert
Certified Scope
Explore our full catalog of installation accessories, custom extruded parts, and safety valves engineered for leak-free, long-term performance.
Ningbo Taojun maintains world-class cleanrooms and testing laboratories. By maintaining strict control over environmental variables, we ensure our line dryers and copper fittings are free from dust, ambient moisture, and manufacturing oils.
To deliver zero-defect guarantees, finished filter drier batches undergo high and low-temperature storage testing (ranging from 75°C to -35°C for 500 consecutive hours), thermal shock simulations (10°C to 90°C), and smart film validation using a 100V high-voltage breakdown test. Every drier is oven-purged to guarantee dry delivery to the customer.
Taojun
