Engineered to absorb moisture, eliminate acid, and protect the lifetime performance of compressor systems.
Ningbo Taojun Refrigeration Equipment Co., Ltd. is strategically located in Xiangshan, Ningbo, a renowned coastal manufacturing and tourism hub in China. Founded in 1988, the enterprise traces its origins to the Xiangshan Refrigeration Accessories Factory of Zhejiang University, marrying academic research with industrial manufacturing scale.
Over more than three decades of focused expansion, we have evolved into a national high-tech enterprise specializing in the product design, R&D, and precision manufacture of essential refrigeration system components. Our specialized portfolio includes high-grade copper filter driers, check valves, air conditioning valves, liquid accumulators, condensers, and premium brass accessories.
We are governed by an unwavering dedication to standard compliance, possessing official certifications for ISO9001:2015, EU RoHS environmental directives, and US UL certification. The "Lingshan" brand filter drier stands as a recognized standard of quality within the domestic refrigeration supply chain.
Watch our state-of-the-art automated manufacturing line and precision processing capabilities in action.
Discover the internal architecture and chemistry that protects compressors from moisture, particulate blockages, and acid corrosion.
Moisture enters HVAC/R systems via micro-leaks, incorrect servicing, or structural gas permeation. It interacts with refrigerants and lubricants to generate hydrofluoric and hydrochloric acids. Our driers use premium molecular sieves to bind free water molecules chemically down to PPM levels.
During installation and brazing processes, copper oxide, flux residues, and metal filings can detach and flow within the system. Micro-fine metal mesh screens integrated inside our filter shells trap solid impurities, preventing capillary tube blockage and piston abrasion.
Utilizing high-purity TP2 copper shells and robotic argon arc welding processes, our copper filter driers ensure perfect mechanical sealing. This guarantees zero refrigerant leakage, matching the design lifecycle requirements of domestic refrigerators and heavy-duty industrial systems.
A high-performance copper filter drier must handle fluctuating temperature ranges and high internal operating pressures. The engineering specification of our product line relies on three pillars:
We source deoxidized high-phosphorus copper (TP2) with a minimum copper content of 99.9%. This optimizes thermal stability, offers robust resistance against structural oxidation, and yields excellent brazing performance in industrial assemblies.
Our core desiccant exhibits high water adsorption capacity (≥20% of dry weight). The 3-Angstrom pore size selectively traps polar water molecules while leaving refrigerant gases (such as R134a, R600a, R290, and R1234yf) untouched, preventing refrigerant breakdown.
To protect delicate expansions valves and capillary tubes, our driers integrate multi-layer mesh screens. Fine fiberglass felt filters out particles down to 20-30 microns, maintaining smooth refrigerant flow velocities without pressure drops.
Addressing key compliance, sustainability, and refrigeration shifts across international supply chains.
The global refrigeration and air conditioning industry is experiencing monumental change governed by the Kigali Amendment to the Montreal Protocol and local initiatives like the EU F-Gas Regulation and the US EPA AIM Act. This has driven the industry away from high-GWP HFCs (like R404A and R134a) toward eco-friendly natural alternatives, namely hydrocarbons (R290 propane, R600a isobutane) and CO2 (R744).
These new generation refrigerants demand high purity. Impurities and water lead directly to acid formation, polymer degradation, and valve failures. The chemical stability of lubricants like POE (polyolester) or PAG (polyalkylene glycol) is sensitive to moisture. Our copper filter driers are engineered to handle HFC/PAG/POE compatibility issues, ensuring that the moisture content is retained under 10 PPM to prevent compressor degradation.
At Ningbo Taojun, we have established mature partnerships with global appliance manufacturers, supplying specialized components directly to market leaders including:
Exporting to Europe, North America, South America, Southeast Asia, and the Middle East, our logistics processes are optimized to ensure rapid response, offering 72-hour delivery capacities for urgent parts and robust custom packaging configurations.
Inbound raw materials inspection
Automated copper tube cutting
Precision tube end spinning
Molecular sieve filling
Robotic welding line
How we innovate to meet tomorrow's carbon neutrality targets, high pressure demands, and smart refrigeration requirements.
CO2 subcritical and transcritical refrigeration loops operate under high working pressures (up to 120-140 bar). Standard copper components cannot withstand these forces. Our technology roadmap features thicker-walled copper-iron alloy (CuFe2P) structures designed to endure high burst pressures while offering the simple brazing properties of standard copper.
By implementing 100% recyclable, RoHS-compliant raw materials and replacing traditional solvent cleaning methods with dry mechanical oil removal, Ningbo Taojun aims to reduce the manufacturing carbon footprint of each drier by 35% by 2026. This lines up with global WEEE and REACH environmental targets.
We are researching the integration of colorimetric moisture indicator sensors within the copper shell. This would allow technicians to inspect the system visual window directly, predicting internal oil degradation and preventing premature compressor burnouts before they occur.
Backed by advanced production systems, international standards, and top-tier scientific collaboration.
Innovation is the essence of Taojun's culture. Our core machinery infrastructure consists of specialized automated lines imported directly from Germany, assuring geometric tolerances to within ±0.02 mm.
Our R&D division has established active research collaborations with the University of Science and Technology of China (USTC) and Zhejiang University. Guided by 15 senior material scientists and doctors, we continuously optimize thermodynamic flow rates, mechanical structures, and desiccant efficiency.
In-process checks
Welding alignment
Internal mesh insertion
Finished goods sorting
Packaging line vacuum sealing
Tailoring filtration components to meet the requirements of varied commercial environments.
Typically optimized for refrigerator/freezer repairs using 10g, 15g, and 20g configurations, compatible with eco-friendly hydrocarbon refrigerants (R600a and R290).
Designed for supermarket showcase counters, hotel ice makers, and walk-in cold rooms. Incorporates double copper filters to handle higher refrigerant volumes and load fluctuations.
High-volume moisture removal filters designed for automotive cooling systems and VRF HVAC units, accommodating high mechanical vibrations and temperature spikes.
Commercial Refrigeration Units
Refrigerator Evaporator Loop
Air Conditioner Condenser
High Precision Refrigerant Loops
Bespoke Commercial Assemblies
Heavy Duty HVAC Filtration
Industrial Cold Room Installation
Ice Maker Component Assembly
Automobile A/C Compressor Loop
Walk-in Freezer System
Integrating accumulators, vibration absorbers, charging valves, and condensers to build robust refrigeration loops.
In modern high-performance refrigeration cycles, a filter drier cannot work in isolation. The cooling circuit requires a balancing act between pressure drops, liquid storage, and pulsation reduction.
Our engineering division provides customized system modules combining our copper accumulators, vibration mufflers, capillary tube lines, and stop valves into pre-assembled units. This structural pre-assembly helps global OEMs minimize brazing errors in their final assembly lines, ensuring leak-free configurations and saving labor costs.
By coordinating flow dynamics between the accumulator (which prevents liquid refrigerant return from flooding the compressor crankcase) and the copper filter drier (which captures remaining micro-moisture), we extend the active working life of compressors by up to 45% compared to mismatched components.
Our commitment to partnership goes beyond manufacturing. We provide a full technical envelope to support our clients' systems:
Verifiable high-quality manufacturing standards for global supply chains.
Ningbo Taojun operates in strict compliance with GB/T19001-2016 / ISO9001:2015 quality standards (Certification Registration No.: 41325Q00065R0S). This certification validates our complete design, processing, and assembly lines for filter driers, copper stop valves, condensers, and other mechanical refrigeration parts.
Our international certification credentials are fully traceable and verifiable online via the official website of the Certification and Accreditation Administration of the People's Republic of China (CNCA) at www.cnca.gov.cn or through our certification body, Zhongci International (www.zcgirz.com).
Main Certification Document
Detailed Scope of Certification
UL Compliance Certificate
CE Directives
Academic Alliance
RoHS Certification
IATF 16949 Certification
A detailed view of our processing floor, high-precision assembly lines, and mechanical verification labs.
Our Manufacturing Execution System (MES) provides real-time tracking from raw copper tubing to final sealed packaging, ensuring complete trace-back capability.
Automated robotic end-forming and molecular sieve injection machinery maintain high assembly consistency, minimizing human error.
Equipped with high-precision optical measurement machinery, helium mass spectrometers, and pressure burst chambers to audit component limits.
Our journey began in 1988 as a specialized supplier under Zhejiang University. Over the years, we have reached key development milestones:
We believe that a brand is supported by its culture. Our development is guided by four core values:
We adhere to integrity management and prioritize product quality. Honesty is the foundation of our competitive edge and has allowed us to take every step in a steady way.
Innovation is the essence of our group culture. We make innovations in concept, technology, and management to adapt to market shifts and environmental requirements.
We maintain a strong sense of responsibility toward our clients, our employees, and the environment. This responsibility is the driving force behind our strict quality control systems.
Working together to create win-win outcomes is a key goal. Through effective cooperation, we achieve integration of resources and mutual complementarity.
Our Professional Engineering Group
Corporate Culture and Strategic Alignment
Standard models widely specified by appliance manufacturers worldwide.
Standard Copper Filter Drier Batch
Double-Tail Refrigerator Filter Driers
HVAC Copper Accumulators
Air Conditioner Stop Valves
Air Conditioner Condenser Coils
Brass and Copper Fittings Assortment
Expert answers to common engineering and sourcing questions about copper filter driers.
A 3A molecular sieve has a pore diameter of approximately 3 Angstroms. This size is ideal because it allows water molecules (which have a kinetic diameter of 2.6 Angstroms) to enter and be adsorbed, while excluding refrigerant molecules like R134a or R290 (which have kinetic diameters larger than 3 Angstroms). If a 4A molecular sieve is used, it may adsorb the refrigerant gas, leading to chemical breakdown, localized heating, and reduced drying capacity.
Excess moisture in a refrigeration system causes two main issues: first, it can freeze at the expansion point (such as the capillary tube exit), causing physical ice blockages that stop refrigerant flow. Second, water reacts with refrigerants and lubricants to form acids. These acids degrade the motor winding insulation, leading to compressor burnouts, and attack metal surfaces, causing copper plating on compressor bearings.
Key indicators that a filter drier requires replacement include a noticeable temperature drop between the inlet and outlet of the drier (indicating partial blockage), high discharge pressures, low suction pressures, or visible copper plating on system components. The filter drier should also be replaced whenever the refrigeration loop is opened to the atmosphere for repairs, to prevent moisture saturation of the desiccant.
Yes, we design custom high-pressure filter driers. Standard copper shell components are rated for systems like R134a or R600a. For high-pressure natural refrigerants like CO2 (R744), we use thicker-walled TP2 copper or copper-iron alloys (CuFe2P) to meet the required mechanical burst safety limits (exceeding 120 bar) while maintaining standard brazing compatibility.
Our quality control protocol requires 100% of finished filter driers to undergo dry nitrogen pressure leakage checks. We also perform random helium mass spectrometer leak tests on batch runs. In addition, components undergo temperature cycles ranging from -35°C to 75°C for 500 hours to verify structural stability in harsh climates.
From aluminum filter driers and capillary fittings to inverter control boards and electrical capacitors.
Taojun