Explore our premium grade selections of system protectors, connection pipes, vacuum equipment, and accessories manufactured to demanding international tolerances.
Within hermetic refrigeration and air conditioning systems, moisture is the single most destructive element. Its entry into the system—via residual atmospheric humidity during assembly, microscopic leaks, or slow polymer outgassing—triggers a chain reaction of failures. Soluble water interacts with synthetic POE or mineral lubricants to generate aggressive hydrofluoric and organic acids. These acids quickly attack copper capillary tubes, cause copper plating on compressor bearings, and degrade chemical lacquer insulation on motor windings, causing eventual motor burnout.
For global OEMs and industrial designers, choosing a high-grade fridge dryer (filter drier) is not simply a purchasing preference; it is a critical system safety step. Modern refrigeration cycles run at higher temperatures and pressures, especially when transitioning to low global warming potential (GWP) hydrocarbons like R290 and R600a. High-purity deoxidized copper housings combined with high-grade desiccant blends are essential to ensure the longevity of cooling equipment over lifetimes exceeding 10 to 15 years.
As a leading wholesale manufacturer with over 35 years of engineering experience, Taojun Refrigeration manufactures filter driers and related HVAC/R accessories that serve as structural safeguards, preventing debris accumulation, capillary blockage, and chemical breakdown.
Ningbo Taojun Refrigeration Equipment Co., Ltd. is based in Xiangshan, Ningbo, a key manufacturing and transport hub in China. Founded in 1988, our company began as the Xiangshan Refrigeration Accessories Factory of Zhejiang University. This foundational link with one of China's top academic institutions instilled a rigorous scientific approach to research, fluid dynamics, and metallurgy that continues to guide us today.
Over the past three decades, we have evolved from a specialized university workshop into a major global provider of refrigeration components. Today, we operate a state-of-the-art facility dedicated to design, prototype engineering, automated manufacturing, and global exports. In 2021, the company was officially certified as a National High-Tech Enterprise, acknowledging our commitment to intellectual property development and production system optimization.
Our main products include filter driers, check valves, air conditioning split valves, condensers, high-precision brass and copper fittings, and installation accessories. Sold under our domestic brand "Lingshan" and our global brand "Taojun", our products are widely recognized for their reliability, durability, and compliance with strict clean-system standards.
A look at the raw materials, chemical compounds, and joining technologies that make our fridge dryers a standard for top appliance manufacturers worldwide.
We use high-purity TP2 copper (containing minimum 99.90% Copper and 0.015–0.040% Phosphorus) for our filter drier housings. This grade offers excellent brazing characteristics, high thermal conductivity, and strong resistance to corrosion. The seamless wall design provides burst pressure safety margins that easily accommodate demanding operating parameters, including transcritical R744 (CO2) and high-pressure R410A systems.
Our driers contain high-grade 3A molecular sieve desiccant (synthetic alkali metal aluminosilicate). The 3 Angstrom pore size selectively adsorbs water molecules (kinetic diameter ~2.65 Å) while excluding common refrigerants like R134a, R600a, and R290, preventing chemical breakdown of the refrigerant itself. With a water absorption capacity exceeding 20%, our molecular sieves maintain high capacity even at elevated condensing temperatures.
Leakage is a common point of failure for system components. Taojun uses automated high-frequency induction silver brazing and argon arc welding systems to seal all structural seams. This process is monitored in real-time, preventing oxidation inside the drier shell during joining. It ensures clean, high-strength connections that maintain their integrity under thermal cycling and system vibration.
Explore our core product line, engineered to meet the requirements of leading brands including Haier, Midea, Whirlpool, and Electrolux.
Our commitment to precision is backed by our implementation of a MES (Manufacturing Execution System) intelligent workshop management platform. This system integrates material tracking, automated welding parameters, and testing data in real time, minimizing human error and ensuring process traceability for every production batch.
We source premium raw materials for all critical components. Liquid crystal spacers and high-uniformity ITO films are imported directly from leading partners in Japan, while specialized moisture-resistant adhesives are sourced from Europe. Our liquid crystal operating temperature parameters span from -35°C to 75°C, ensuring stability in extreme industrial environments.
| Parameters | Industrial Specification | Taojun Standards |
|---|---|---|
| Body Material | Commercial Copper Alloy | TP2 High-Purity Deoxidized Copper (≥99.9%) |
| Desiccant Composition | Standard 3A or 4A Sieve | High-capacity 3A Molecular Sieve (Zeolite) |
| Moisture Retention Cap. | ≥ 15% at 25°C | ≥ 20% at 25°C (Ensures lower dew point) |
| Burst Pressure Rating | Up to 4.2 MPa | ≥ 6.0 MPa (Supports CO2 & R410A) |
| Defect Control System | 1.5% AQL Selection | CCD Visual Inspection & MES Tracking (≤0.05%) |
Providing specialized integration, raw material cost management, and rapid logistics to streamline B2B procurement for commercial and residential sectors.
We accommodate customized sizes, lengths, and inlet/outlet configurations (including dual-inlet or integrated capillary tube extensions). Our team of 15 engineers handles customer designs from concept to technical draft within 48 hours.
Copper pricing is subject to high global market volatility. Taojun operates strategic metal forward contracts and raw material reserves. This allows us to offer stable wholesale pricing to partners with long-term supply agreements.
Strategically located near Ningbo Port, we leverage simplified customs procedures. We maintain an inventory of standard components to support 72-hour fast shipping for stock items and a 500-unit MOQ for custom runs.
We provide comprehensive engineering support, training guides, and system design optimization evaluations. Our technical support lines are open 24/7, with guaranteed response within 8 hours.
Taojun components are designed for high reliability across a range of applications, including domestic cooling, commercial cold chains, and automotive AC systems.
For B2B buyers, regulatory compliance is key to entering international markets. Our manufacturing facilities operate under certified quality management systems to guarantee compliance with regional environmental directives.
Taojun holds active certifications under GB/T19001-2016/ISO9001:2015 (Registration No.: 41325Q00065R0S). This framework covers the design, fabrication, and testing of our copper filter driers, condenser coiling systems, and access valves. It ensures that every step of our manufacturing process—from raw material receipt to chemical cleaning and final sealing—conforms to documented standards.
Main ISO Certificate
Certificate Scope
The global refrigeration industry is undergoing a major shift. Strict F-Gas regulations in the European Union and the Kigali Amendment in the United States are phasing out high-GWP HFCs (like R404A and R134a) in favor of natural hydrocarbon alternatives, primarily R290 (propane), R600a (isobutane), and transcritical R744 (carbon dioxide).
This transition introduces distinct chemical and engineering requirements for refrigeration components:
Our engineering team includes 15 researchers, including doctors and professors from the University of Science and Technology of China (USTC). This academic foundation enables us to develop custom alloy compositions, analyze fluid flow characteristics, and design specialized components for major appliance manufacturers.
Our core team is dedicated to technological innovation and quality leadership.
Complete your design with our high-conductivity connections, control units, and vacuum equipment designed for professional installations.
Expert insights on product specifications, desiccant materials, and best practices for refrigeration system maintenance.
The pore size of a 3A molecular sieve is approximately 3 Angstroms. This pore size is ideal for adsorbing water molecules (kinetic diameter ~2.65 Å) while excluding larger refrigerant molecules like R134a, R600a, and R290. If a 4A molecular sieve were used, it would co-adsorb the refrigerant alongside the water, causing chemical reactions that can degrade both the desiccant and the refrigerant, reducing system efficiency and generating acids.
We use automated induction silver-brazing and argon arc welding systems to ensure clean, oxidation-free joints. Additionally, 100% of our production line is tested for leak tightness using helium mass spectrometer leak detection. This method allows us to detect micro-leaks down to 1 x 10^-7 mbar·l/s, providing a standard of leak protection that exceeds standard pressure decay testing.
Yes, all Taojun copper filter driers are designed for compatibility with low-GWP natural hydrocarbons, including R290 (propane) and R600a (isobutane). We use compatible synthetic lubricants, high-purity TP2 copper housing, and specialized 3A desiccants to prevent chemical degradation. The components are thoroughly dehydrated and sealed with nitrogen-purged end-caps to ensure moisture levels remain below industry thresholds prior to installation.
Our standard Minimum Order Quantity (MOQ) for customized filter driers or fittings is 500 units. Depending on the complexity of the design, our engineering team can provide technical drawings within 48 hours. After prototype approval, mass production typically takes 15 to 25 days. For standard catalog products in stock, we offer rapid 72-hour dispatch from Ningbo Port.
Ningbo Taojun holds active certifications for ISO 9001:2015 Quality Management Systems (Registration No.: 41325Q00065R0S). Our products are certified compliant with EU RoHS and REACH environmental directives. We also hold UL safety listings for high-pressure system safety in North American markets, ensuring compliance for global export.
A world brand is supported by a strong corporate culture. Our group's development has been guided by four core values: Honesty, Innovation, Responsibility, and Cooperation.
We adhere to the principles of integrity management and quality first. Honesty is a key driver of our group's competitive advantage and long-term customer partnerships.
Innovation leads to development and growth. Our teams pursue continuous improvement across concepts, manufacturing processes, technologies, and management practices.
We maintain a strong sense of responsibility toward our clients, our employees, and the environment. This drive guides our development of energy-efficient and low-GWP products.
We work with our partners to create win-win situations. Through effective collaboration, we integrate resources, leverage complementary strengths, and help professional teams excel.
Taojun