Engineered to absorb moisture, eliminate acids, and protect critical compressors across diverse HVAC-R cycles.
Within any sealed thermodynamic HVAC-R system, moisture is public enemy number one. The ingress of trace moisture reacts with standard synthetic ester lubricants (POE) or alkylbenzene (AB) oils, leading to rapid hydrolysis and the formation of destructive hydrochloric or hydrofluoric acids. These acids attack copper windings, prompt compressor motor burnout, and create metal oxides that block expansion valves.
As cooling loops transit globally toward low-GWP (Global Warming Potential) natural refrigerants such as R290 (Propane) and R744 (CO₂), standard copper filter driers must undergo severe engineering transformations. Taojun's latest line of solid-core and molecular sieve filtration systems incorporates high-purity copper housings, integrated particle matrices, and advanced molecular sieves engineered explicitly for chemical compatibility under varying temperature differentials (-35°C to 75°C).
Ningbo Taojun Refrigeration Equipment Co., Ltd. has stood at the crossroads of academic research and high-precision manufacturing since 1988.
Located in Xiangshan, Ningbo—a prominent industrial hub—our company's roots go back to the Xiangshan Refrigeration Accessories Factory of Zhejiang University. Over more than 35 years of rapid engineering advancement, we have consolidated our focus from basic refrigeration attachments to an expansive global portfolio. Our core offerings encompass filter driers, check valves, air conditioning valves, condensers, brass and copper accessories, and specialized air conditioning cables and tie wraps.
In 2021, Taojun was officially designated as a National High-Tech Enterprise in China. Under the prominent domestic brand "Lingshan" and our international brand "Taojun", we establish strategic OEM/ODM partnerships with leading names like Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui. Today, our products are shipped to key global regions, including Europe, North America, South America, Southeast Asia, the Middle East, and Africa.
Exploring the material layers, molecular dynamics, and core structure of Taojun Filter Driers.
Every copper filter on dryer shell is extruded using high-purity copper piping. This material offers superior corrosion resistance, eliminates porosity, and can easily withstand high peak system pressures (exceeding 60 bar in CO₂ transcritical cycles). Standard designs feature automated argon arc and induction welding, ensuring zero leaks under harsh vibration stresses.
Our internal matrix features specialized 3A Molecular Sieves combined with a structured activated alumina/carbon layer. With a pore diameter of approximately 3 Angstroms, our desiccant selectively absorbs water molecules without co-adsorbing the refrigerant itself. This process ensures water absorption efficiency remains ≥20% under extreme temperature shifts.
Each unit features a progressive mesh sieve grid at the outlet, filtering down to 25 microns. This design prevents desiccant dust or metal particles from traveling to the capillary tube or expansion valve. All units undergo drying in vacuum ovens, nitrogen purging, and airtight sealing before leaving the factory.
Staying ahead of F-gas regulations and the global transition to low-GWP systems through proactive R&D.
The global refrigeration industry is rapidly phasing out high-GWP HFCs (like R404A and R134a) in favor of natural alternatives (like R290, R600a, and R744/CO₂). Because these natural options have distinct chemical profiles and operating pressures, filtration systems must evolve in response.
Our engineering roadmap includes incorporating IoT diagnostics directly into liquid line filter driers. By integrating sub-miniature moisture and pressure-drop sensors into the core matrix, HVAC systems can monitor desiccant saturation in real time. This allows the system to alert operators before moisture leads to acid formation or expansion valve freeze-ups.
How Taojun ensures raw material availability, consistent quality control, and on-time global delivery.
By partnering directly with major copper smelting refineries in Zhejiang and Anhui, we secure a stable supply of high-grade copper feedstocks. Our critical raw materials—including Japan-sourced ITO films and liquid crystal spacers—meet strict tolerances to guarantee dimensional stability and structural reliability.
Our production facilities utilize a centralized MES (Manufacturing Execution System) to monitor process parameters in real time. From raw tube cutting and core assembly to final high-voltage leak tests, every step is fully tracked to prevent defects and keep operations running efficiently.
Our agile production lines allow us to offer low minimum order quantities (down to 500 units) for custom sizes and shapes. We maintain critical safety stock levels, enabling us to dispatch standard filter configurations within 72 hours to resolve urgent supply chain disruptions.
Taojun copper filter driers protect refrigeration loops across a wide range of operating conditions.
Installed as standard components or used as repair parts, our compact copper filter driers absorb moisture and filter out impurities in residential appliances. They ensure reliable, maintenance-free operation over the typical 10 to 15-year lifespan of home cooling systems.
In supermarket displays, walk-in freezers, and commercial ice machines, filter driers face constant, variable load cycles. Our high-capacity solid core models prevent system freeze-ups, helping businesses avoid expensive spoilage and unscheduled downtime.
Electric vehicle (EV) heat pump systems require precise thermal management. Our custom-designed extruded copper drying filters are engineered to handle the vibration stresses and strict space constraints of automotive applications.
A transparent look inside our production facilities, showing where our raw copper pipes are shaped, brazed, and filled.
Founded in 1988 as the Xiangshan Refrigeration Accessories Factory of Zhejiang University, our journey has been defined by a constant focus on technological innovation.
We believe a global brand must be supported by a strong corporate culture. We cultivate our values through continuous improvement, technological leadership, and close collaboration with our partners.
Honesty: We prioritize integrity, customer success, and building a strong industry reputation as the core of our competitive advantage.
Innovation: We continuously innovate our products, manufacturing processes, and management structures to adapt to emerging market opportunities.
Responsibility: We maintain a strong sense of responsibility to our customers, ensuring consistent quality and reliable system performance.
Verification, international testing standards, and our multi-stage Quality Assurance framework.
Our quality assurance framework starts with strict inspections of incoming raw materials. Raw copper tubing must pass eddy current crack detection, while molecular sieves are tested for moisture absorption rates. Our finished products undergo intensive verification testing, including:
ISO 9001:2015 Certificate
Certified Scope
Meets North American safety standards for high-pressure refrigeration systems.
Complies with European health, safety, and environmental protection directives.
Guarantees that all materials are free from restricted hazardous substances.
Official registry document verifying our active quality management system status.
Awarded by the science and technology department, this recognizes our long-term partnership with Zhejiang University and our ongoing focus on product innovation.
Our operations are backed by specialized laboratories and automated manufacturing lines.
Technical answers to common questions about molecular sieve dry filters and system installation.
Explore our full line of refrigeration components, including Bundy tubes, accumulators, control boards, and specialized tooling.
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