Explore our industry-certified components designed for superior durability, moisture control, and heat transfer efficiency.
Bundy Tubing (originally developed as double-walled copper-brazed steel tubing) represents a cornerstone of high-pressure fluid conveyance. The manufacturing process of a Bundy tube involves double-wrapping a copper-coated carbon steel strip through a full 720-degree forming cycle. This pre-formed tube is then heated in a controlled atmosphere furnace, where the copper melts and diffuses into the steel grain boundaries, creating a metallurgical bond that provides exceptional burst strength, high fatigue limits, and pressure resilience.
In thermal systems, these tubes are subjected to aggressive cyclic pressures, chemical environments, and extreme temperatures. Utilizing advanced carbon steel yields low-yield-strength components that are highly formable, allowing manufacturers to bend, flare, and coil the tubes into condenser configurations without crack propagation or microscopic wall compromises.
Ningbo Taojun Refrigeration Equipment Co., Ltd. applies thirty years of thermal engineering experience to manufacture high-durability condenser coils and fluid lines. We strictly control surface roughness, wall concentricity, and internal residue limits down to micro-gram levels (complying with DIN 8964 standard) to prevent capillary restriction or compressor contamination.
Founded in 1988 as the Xiangshan Refrigeration Accessories Factory of Zhejiang University, our organization has transitioned over three decades into a comprehensive industrial manufacturer. Today, Ningbo Taojun Refrigeration Equipment Co., Ltd. (established under its current legal entity in 2012) manufactures filters, check valves, air conditioning valves, copper-brazed steel tubing (Bundy lines), and complex condenser assemblies.
Certified as a National High-Tech Enterprise in 2021, the company coordinates with academic and engineering partners to research thermal fluid dynamics and metallurgical coatings. Our flagship brand, Lingshan Filter, has become synonymous with component durability in domestic commercial and industrial refrigeration networks.
Our operations spans domestic and global supply networks, including direct component supply agreements with international brands such as Haier, Midea, Gree, Xinfei, Whirlpool, Electrolux, and Huarui. By integrating supply chains from Ningbo's deep-water port nodes, we export to Europe, North America, Southeast Asia, South America, and the Middle East.
Our manufacturing facility processes raw metals into highly clean, corrosion-resistant components optimized for eco-friendly refrigerants.
We manufacture copper filter driers engineered specifically to capture moisture, organic acids, and microscopic particulate matter within a refrigeration loop. Operating in both domestic and commercial environments, these units leverage a dual-action system: a high-efficiency 3A molecular sieve core (achieving water adsorption rates of ≥20%) combined with activated carbon matrices to absorb acid traces before they degrade the compressor oil.
Industrial reliability built on automated German equipment, Japanese material sources, and academic R&D partnerships.
Our core production lines incorporate automated roll-forming and high-frequency brazing equipment imported directly from Germany to ensure consistent metallurgical bond strength.
Our engineering division partners with professors and materials science PhDs from the University of Science and Technology of China (USTC) to continuously improve brazing chemistry and tube fatigue resistance.
We manufacture custom shapes, specific coil diameters, variable tube walls, and tailored connection ends according to international structural drawings.
We source raw liquid crystal spacers and ITO film from certified Japanese suppliers to maintain temperature stability. Internal copper pipe options conform to high-purity ASTM standards.
Our QA laboratory subjects components to high/low thermal cyclic storage (-35°C to 75°C for 500 hours), thermal shock testing (10°C to 90°C), and 100V high-voltage insulation tests for active components.
A comparative analysis of industrial fluid tubing parameters for refrigeration and HVAC system design.
| Performance Metric | Double-Walled Bundy Steel Tube | Seamless Copper Tube | Extruded Aluminum Tube |
|---|---|---|---|
| Tensile Strength (MPa) | ≥ 290 MPa (High mechanical stress resistance) | ≥ 200 MPa | ≥ 68 - 120 MPa |
| Burst Pressure Limit (Ø 4.76mm) | Up to 110 MPa (Suitable for high-pressure CO2) | Around 65 MPa | Around 35 MPa |
| Thermal Conductivity (W/m·K) | 45 - 55 W/m·K | 380 - 400 W/m·K | 200 - 230 W/m·K |
| Vibration Fatigue Life | Excellent (Resists compressor vibration) | Moderate | Low (Susceptible to fatigue crack) |
| Corrosion Protection Coating | Zinc + Olive Chromate / PVF / Epoxy Coating | Natural oxide layer / tinned options | Anodized / Chromate treatment required |
| Relative Cost Index | Cost-efficient (Ideal for mass production) | High (Subject to copper market volatility) | Low (Subject to mechanical limits) |
Inside our ISO 9001 certified plant: precision fabrication, chemical testing, and quality control.
How three decades of technical focus evolved into a digitally managed smart factory floor.
Our organizational culture is based on four operational pillars:
Our Bundy tubing and component systems are applied across automotive cooling, household cooling, and industrial HVAC loops.
Our manufacturing processes are audited and certified to meet international engineering, safety, and environmental standards.
Our facility operates under a registered quality management framework (Registration No.: 41325Q00065R0S). This certification validates our design, production, and testing standards for filter driers, condensers, access valves, and tube assemblies.
Our manufacturing and environmental controls comply with international quality standards. We conduct helium mass spectrometer leak detection, optical sorting, and high-pressure validation to ensure component reliability before shipping.
Our automated production floor features real-time MES tracking, cleanroom environment controls, and precision fabrication machinery.
High-performance refrigeration filter driers, accumulator assemblies, and specialized brass connection fittings.
Frequently asked questions regarding material selection, surface coatings, burst pressure tolerances, and OEM capabilities.
Complete your supply line with our high-strength brazing alloys, heavy-duty outdoor mounts, and manifold monitoring gear.
Taojun