Engineered to eliminate system impurities, capture trace moisture, and prevent compressor degradation in high-efficiency cooling circuits.
Within any vapor-compression refrigeration loop, the filter drier acts as the primary guardian of internal hygiene. High-efficiency thermal systems face continuous risks from system contaminants including moisture, organic acids, solder slag, flux residues, and microscopic wear debris. The introduction of modern eco-friendly refrigerants like R32, R290 (propane), and R744 (carbon dioxide), coupled with hygroscopic polyolester (POE) and polyvinyl ether (PVE) synthetic oils, has elevated the requirements for chemical stabilization within the refrigerant lines.
Water infiltration poses a dual hazard: it leads to ice formation at the expansion valve, restricting flow, and acts as a catalyst for POE oil hydrolysis. This chemical reaction breaks the oil down into alcohol and organic acids. These acids degrade the compressor motor windings, prompting electrical failures. Consequently, utilizing premium-grade molecular sieve desiccants housed in chemical-resistant copper casing is no longer optional—it is a baseline requirement for sustainable system integration.
Our filter driers utilize high-density Zeolite 3A molecular sieves, optimized to selectively capture water molecules (diameter ~2.8Å) while completely bypassing larger refrigerant molecules like R134a or R32. This ensures chemical stability and zero breakdown of critical working fluids.
From our university research roots to a globally recognized high-tech manufacturing leader.
Founded in 1988, Ningbo Taojun Refrigeration Equipment Co., Ltd. (originally known as the Xiangshan Refrigeration Accessories Factory of Zhejiang University) has spent over 35 years refining desiccant and filtration technology. Located in Xiangshan, Ningbo, our facility occupies a pivotal position within China’s major advanced manufacturing cluster. In 2021, Taojun was officially accredited as a National High-Tech Enterprise, acknowledging our achievements in HVAC/R components design, engineering innovation, and quality control.
Under our premium domestic brand "Lingshan" and our specialized international brand "Taojun", we engineer copper filter driers, check valves, AC charging valves, split service valves, condensers, and precision brass fittings. Through constant material research, structural optimizations, and factory automation, we provide consistent supply to some of the world's most demanding home appliance giants, including Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui.
A deep dive into materials, internal architecture, and mechanical performance specs.
Constructed using pure copper pipes (C12200 grade, minimum 99.9% Cu content). Provides outstanding resistance against thermal stress and pressure fatigue, withstanding the high operating pressures of systems running R410A and R32 without micro-fissuring or joint stress.
Contains premium-grade synthesized 3A molecular sieve granules. Engineered with a moisture absorption capacity of ≥20%. Retains structural integrity without powdering or disintegrating during high-velocity refrigerant flow, preventing internal line blockages.
Welded under strict atmospheric shielding using advanced argon arc processing. Ensures leak-free joints capable of enduring continuous thermal cycling from -40°C to +120°C, and prevents high-pressure leaks over long service lifespans.
| Product Specification Parameter | Standard Configuration Value | Compliance / Testing Standards |
|---|---|---|
| Copper Pipe Grade | C12200 TP2 (Phosphorus-Deoxidized Copper) | ASTM B280 / EN 12735-1 Compliance |
| Active Desiccant Mix | 90% 3A Molecular Sieve + 10% Activated Carbon | High-density particle attrition resistance |
| Moisture Adsorption Capacity | ≥20% by dry desiccant weight | Tested at 25°C and 50% relative humidity |
| Burst Pressure Rating | ≥ 6.0 MPa (870 PSI) | Designed for modern HFC/HFO blends and R32 |
| Max Operating Temp Range | -35°C to +75°C (Refrigerant Environment) | 500-hour continuous high-temp endurance testing |
How our copper filter driers and connection valves adapt to diverse refrigeration demands globally.
For household refrigerators and commercial food storage cabinets. Copper filter driers (typically 10g to 20g weights) capture the trace moisture present in polyester lubrication oils, preventing ice blockages and copper plating on steel bearing surfaces within the hermetic compressor.
Customized high-durability drying filters engineered for passenger vehicles and public transport systems. Designed to withstand prolonged vibrational stresses, road shock, and high ambient operating temperatures while keeping liquid lines moisture-free.
High-capacity universal industrial desiccant cartridges built to handle continuous ice production cycles. These components filter out trace particulate wear debris from water-circulation valves and high-flow copper piping configurations.
Zero compromise on materials. Every batch is traceable back to chemical inputs.
Our core production lines are equipped with precision automated machinery imported directly from Germany. This includes precision copper pipe bending units, clean-room assembly lines, and high-frequency induction brazing systems.
Every phase of fabrication is monitored by our customized MES (Manufacturing Execution System) intelligent workshop platform. From structural raw-material receipt to the final vacuum-drying cycle, barcode serialization tracks real-time progress. High-accuracy CCD camera systems inspect dimensional tolerances of flare and solder ends, maintaining critical variations to within a tight ±0.02 mm margin.
We submit representative batch samples to exhaustive stress simulations:
Our raw ITO films feature zero shrinkage, and our protective overlays withstand processing temperatures ranging from 80°C to 90°C. Raw materials are sourced from compliant suppliers in Europe and Japan to maintain consistent chemical stability.
Providing certification documents to verify structural integrity and ease imports for global distributors.
We design and manufacture components to support global integration. Ningbo Taojun maintains compliance with major international standards:
ISO Certificate Document
Detailed Scope Registry
CE Compliance
Founded as Xiangshan Refrigeration Accessories Factory of Zhejiang University. Leveraged university chemical laboratories to develop early molecular-sieve drying solutions for local commercial clients.
Constructed custom factory buildings in Ningbo to accommodate increasing bulk orders, scaling up standard copper extrusion and welding lines.
Adopted the MES intelligent workshop management system, introducing automation and computer-assisted quality control.
Released high-capacity filter driers optimized for environment-friendly low-GWP refrigerants, expanding export networks across North America and Europe.
Over our history, we have established deep supply relationships with appliance manufacturers in domestic and foreign markets. 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.
Our core business philosophy centers on: Honesty, Innovation, Responsibility, and Cooperation. Through this integration of resources and technology, our team of technical specialists helps simplify supply chains, reduce defect rates, and optimize performance for global HVAC/R installations.
Our R&D initiatives focus on meeting global environmental goals and optimizing component design.
Developing molecular sieve formulations optimized for natural working fluids like R744 (CO2) and R290 (propane). These systems require high working pressures and specialized moisture adsorption properties to prevent chemical reactions.
Investigating the integration of micro-sensors within the liquid line filter drier. These inline monitors track real-time moisture saturation, allowing maintenance crews to replace components before moisture breaks down compressor oils.
Working to minimize emissions in our Ningbo production facilities. By optimizing induction heating and recycling copper offcuts, we target a low carbon footprint for our products.
Expert insights for mechanical engineers, refrigeration technicians, and bulk purchasers.
Supporting stable performance across residential and commercial HVAC networks.
Our most frequently shipped components, designed for long-term durability in cooling systems.
Providing reliable performance, from minor repairs to large-scale system builds.
Taojun
