Engineered for thermal efficiency and compliance, supporting high-capacity top-freezer evaporators, compressors, and system accessories.
Within the highly regulated global HVAC/R appliance sector, top-freezer refrigeration units demand the highest levels of thermal efficiency, hermetic isolation, and structural longevity. Central to these parameters is the Top Freezer Copper Pipe. Top freezer designs place the cold reservoir at the high plane of the cabinet. This demands robust refrigerant elevation pressure and rapid capillary heat extraction. Consequently, global procurement managers look beyond basic materials, seeking custom-engineered metallurgical tubing capable of enduring dynamic compressor vibration, continuous phase-change thermal shock, and exposure to corrosive environmental agents.
High-quality copper tubing—specifically, phosphorus-deoxidized high-copper alloys (such as C12200)—is the global gold standard. The low level of internal impurities prevents microscopic pinhole air leaks and stress corrosion cracking (SCC) under high load pressures. Furthermore, with the industry transitioning toward hydrocarbon refrigerants like R600a (isobutane) and R290 (propane), pressure levels and safety demands have changed. Systems must minimize joints, maximize wall uniformity, and integrate moisture-wicking inline components. This is why B2B supply chains trust Taojun Refrigeration to supply reliable copper components that meet tough global energy efficiency and eco-design standards.
Founded in 1988 as the Xiangshan Refrigeration Accessories Factory of Zhejiang University, Ningbo Taojun Refrigeration Equipment Co., Ltd. has developed over three decades into a leading enterprise. Today, we specialize in the design, development, manufacture, and distribution of top-tier HVAC/R accessories. Headquartered in the coastal industrial hub of Ningbo, China, we operate state-of-the-art facilities dedicated to producing high-reliability copper pipes, filter driers, check valves, air conditioning valves, and custom condensers.
In 2021, Taojun was recognized as a National High-Tech Enterprise, acknowledging our focus on technological innovation and equipment upgrades. We aim for 100% customer satisfaction by maintaining strict quality controls. Our "Lingshan" filter drier brand is highly regarded in the domestic and global refrigeration markets. The company holds certifications including ISO9001:2015, EU RoHS, REACH, and US UL, providing reliable quality assurance for B2B procurement partners worldwide.
How our C12200 high-purity copper tubes and multi-barrier drier systems guarantee refrigeration circuit purity and life extension.
A major cause of premature compressor breakdown is moisture and organic acids inside the capillary system. Water content reacts with synthetic polyolester (POE) or polyalkylene glycol (PAG) lubricants, forming acids that damage the motor windings. Our advanced refrigeration copper line uses specialized filter driers to address this issue:
| Material / Property Parameter | C12200 Phosphorus-Deoxidized (DHP) Copper | Industry Standard Requirements (Standard GB/T) | Taojun Enhanced QC Margins |
|---|---|---|---|
| Copper Content (Cu + Ag min) | ≥ 99.90 % | ≥ 99.70 % | 99.95 % guaranteed purity |
| Phosphorus Content (P range) | 0.015% – 0.040% | 0.012% – 0.050% | Controlled at 0.022% for optimal weld integrity |
| Burst Pressure Limit (Ø 6.35mm x 0.75mm) | > 42.0 MPa | ≥ 35.0 MPa | Tested up to 50.0 MPa (Zero rupture) |
| Molecular Sieve Adsorption Capacity | ≥ 22.5% at 25°C | ≥ 18.0% | Customized high-absorption spherical zeolites |
| Bending & Flaring Expansion Ratio | Min 40% expansion without split | Min 30% | 100% eddy current tested for micro-fractures |
From material sourcing to advanced production lines, discover our manufacturing and engineering advantages.
Our primary fabrication, draw-benches, and annealing chambers are imported directly from Germany to ensure tight dimensional tolerances.
Our design center includes 15 engineers, featuring PhDs and professors from the University of Science and Technology of China.
We customize copper tube configurations, capillary assemblies, and connector fittings based on customer drawings.
We source specialized films and temperature-resistant coatings (up to 80-90°C) from Japan, along with premium European adhesives.
Finished assemblies undergo high-low temperature cycles (-35°C to 75°C), damp heat tests, and high-pressure helium leak checks.
Our processes comply with GB/T19001-2016/ISO9001:2015 standards, and our products carry UL approval for safety and performance.
Decades of manufacturing upgrades, factory expansions, and enterprise management improvements.
Established our initial dedicated manufacturing facility, expanding copper tube drawing capacity to serve early domestic appliance brands.
Integrated the MES intelligent workshop management system, enabling real-time batch tracking and process control for every copper fitting line.
Expanded our global export operations and modernized our testing labs with helium leak detection equipment and automated optical inspection systems.
We believe a strong corporate culture is key to building a global brand. Over the years, Taojun has grown by focusing on our core values: Honesty, Innovation, Responsibility, and Cooperation.
Honesty: We adhere to customer-first, high-integrity business practices, helping us build stable, long-term partnerships with leading appliance OEMs.
Innovation: We continuously update our concepts, technical processes, and management workflows to respond to changes in the global refrigeration market.
Responsibility: We maintain strict quality control standards to ensure the durability and reliability of every component we ship.
Cooperation: We collaborate with clients to optimize designs, reduce material waste, and improve system efficiency, creating mutual value.
ISO 9001 Certificate
Scope Certificate
Our quality management systems are ISO-certified (Registration No.: 41325Q00065R0S). This verification covers our processes for product design, material sourcing, fabrication, assembly, and testing. It ensures that every copper pipe, filter drier, and access valve meets our customers' performance requirements.
These certifications are registered and verifiable through the Certification and Accreditation Administration of China (CNCA) and audited by Zhongci International Certification Co., Ltd. For our global partners, this verification provides confidence that our manufacturing processes meet international industrial and safety standards.
We provide technical and sales support throughout the lifecycle of our components. Our services include:
We work with established global domestic and commercial appliance brands. Over the years, we have built relationships with leading appliance companies such as Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui.
Our global shipping networks serve clients in Europe, North America, South America, Southeast Asia, the Middle East, and Africa. We configure packaging and export documents to match local port requirements, helping to streamline import clearance.
Answers to key technical questions from procurement departments and refrigeration design engineers.
C12200 is phosphorus-deoxidized high-copper alloy. It is highly resistant to hydrogen embrittlement and stress corrosion. Its material purity (min 99.90%) provides high thermal conductivity and ductibility, allowing for tight bends in top freezer configurations without cracking.
Our copper filter driers feature a C12200 copper body containing a 3A molecular sieve desiccant (water absorption capacity ≥ 20%), plus an activated carbon layer to capture oil sludge, acids, and debris. They are welded using robotic argon-arc processes to ensure leak protection.
Yes. R600a and R290 are hydrocarbon refrigerants requiring high seal integrity. Our components undergo helium leak detection to ensure compliance with global environmental regulations, including RoHS and REACH directives.
We run high-and-low temperature cycles (-35°C to 75°C) for 500 hours, thermal shock testing (10°C to 90°C) for 30 minutes, damp heat exposure, and high-voltage breakdown tests on our electrical assemblies.
We offer customization for tube diameter, wall thickness, length, bending profiles, filter drier volumes, and connection fitting types. You can share your system designs with our engineering team to get tailored prototypes.
Explore our complete range of filters, accumulator systems, and control boards designed to improve refrigeration cycle performance.
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