Explore our leading collection of high-durability components, designed to meet the rigorous flow control and thermal transfer requirements of worldwide distribution systems.
Ningbo Taojun Refrigeration Equipment Co., Ltd. is strategically situated in Xiangshan, Ningbo, a prominent coastal hub. Established in 1988, our foundation stems from the prestigious Xiangshan Refrigeration Accessories Factory of Zhejiang University.
Over three decades of manufacturing excellence, process innovation, and strategic infrastructure scaling have propelled Taojun into a national high-tech enterprise. Today, we stand as an integrated global powerhouse specializing in the custom design, development, high-volume production, and logistical fulfillment of commercial grade HVAC/R components.
From standard copper and brass elbows to complex refrigeration filter driers, check valves, and condensers, our "Lingshan" brand is highly respected in the refrigeration industry. We maintain strict compliance with global testing protocols, including ISO 9001:2015 quality systems, EU RoHS environmental mandates, and US UL standards.
Our factory in Zhejiang, China uses automated production methods to maintain strict tolerances, excellent surface quality, and strong mechanical joints. This ensures our copper elbow fittings meet the rigorous pressure demands of modern refrigeration and air conditioning systems.
Understanding the critical performance metrics, regulatory environments, and chemical specifications that engineering teams prioritize when choosing industrial-grade copper elbows.
With R410A and natural CO2 (R744) refrigerants operating at high pressures, piping systems need copper elbows with high yield strength and fatigue resistance under cyclic stress.
Our elbows maintain standard wall thickness throughout the bend profile. We limit thinning on the outer curve to under 8% and ovality to under 5% to avoid flow resistance or failure.
Residual carbon inside refrigeration lines can react with modern synthetic oils (POE, PAG), causing compressor failure. Our chemical washing limits residual carbon to less than 0.038g/m².
We manufacture our copper elbows using C12200 Deoxidized High Phosphorus (Cu-DHP) Copper, with at least 99.9% pure copper and 0.015-0.040% phosphorus. This precise composition removes oxygen during casting, preventing hydrogen embrittlement. It also ensures excellent brazeability, high thermal conductivity, and resistance to corrosion in wet, industrial environments.
Our manufacturing and quality controls are designed to match global technical standards, ensuring trouble-free integration into international construction and commercial projects.
| Standard Specification | Applicable Region / Agency | Focus Area | Ningbo Taojun Compliance Metric |
|---|---|---|---|
| ASME B16.22 | North America (ANSI/ASME) | Wrought Copper Pressure Fittings | Full dimensional, tolerance, and minimum burst pressure compliance. |
| EN 1254-1 | European Union (CEN) | Copper Fittings with capillary soldering ends | Clear plug gage certification on both male and female socket ends. |
| ASTM B75 / B280 | International / ASTM | Seamless Copper Tube for HVAC&R | Strict C12200 chemical composition; carbon content < 0.038 g/m² inside. |
| JIS H3300 | Japan (JISC) | Copper and Copper Alloy Tubes | Yield strength, elongation, and grain size verification testing. |
| ISO 9001:2015 | Global Verification | Quality Management Systems | Certified by GB/T19001-2016 (Zhongci International, Reg No. 41325Q00065R0S). |
From household refrigerator lines to industrial HVAC loops and chilled water distribution piping, we provide solutions that maintain systemic pressure integrity.
Variable Refrigerant Flow (VRF) systems operate under high pressures with variable temperatures. Our copper elbows stand up to thermal expansion and vibration without leak risks, keeping long-term maintenance costs low.
Working alongside home appliance manufacturers like Midea, Haier, and Whirlpool, we provide customized, precision-formed U-bends and elbows that match exact compressor geometries, making assembly line processes simpler.
For factory cooling water loops, hydraulic systems, and pneumatic piping, our C12200 elbows offer excellent flow rates, reducing pressure drop and energy consumption in circulation pumps.
Our commitment to production quality and engineering R&D is backed by machinery directly imported from Germany and partnerships with top technical universities.
We use automated cold-mandrel bending machinery to shape each curve precisely, keeping structural variations to a minimum.
Our R&D team features 15 engineers, including doctors and professors from the University of Science and Technology of China, focusing on metallurgy and fluid dynamics.
We test our assembled products for leaks using high-sensitivity helium mass spectrometer setups, confirming seal reliability at high pressures.
All copper stock is tested for chemical purity before production. Our specialized film and liquid crystal spacers are sourced directly from trusted partners in Japan and Europe to guarantee durability.
We perform rigorous physical and chemical tests on our components to ensure they meet tough commercial standards and operate reliably over a long service life.
Our parts undergo 500-hour environmental aging tests from 75°C to -35°C to confirm material integrity under extreme weather conditions.
We cycle components between 10°C and 90°C for 30-minute intervals to check resistance to rapid expansion and contraction.
All active electronic or hybrid parts undergo 24-hour electrical aging tests. Standard fittings are pressure-tested to verify safety margins.
Certified Excellence Documents (ISO 9001 Verified)
Main Certification Document
Detailed Scope of Certification
From a university engineering workshop to a modern high-tech enterprise.
Founded as the Xiangshan Refrigeration Accessories Factory of Zhejiang University, blending academic research with early manufacturing.
Built a new production plant to scale up manufacturing capacity for domestic refrigerator brands.
Introduced MES tracking to monitor raw materials and processes in real time.
Established Ningbo Taojun Refrigeration Equipment Co., Ltd. and introduced the "Taojun" brand for condensers and valves.
Recognized as a National High-Tech Enterprise for technology patents and manufacturing innovation.
Upgraded to automated bending, visual inspection, and robotic welding lines.
Guided by four corporate principles: Honesty, Innovation, Responsibility, and Cooperation.
We prioritize integrity, quality, and a solid reputation in all our business relationships.
Innovation drives our business strategy, operational processes, and product engineering.
We commit to product reliability, customer support, and environmental sustainability.
We work closely with global partners to integrate supply chain resources and build long-term relationships.
We provide comprehensive technical support and export services to ensure reliable delivery and integration into your manufacturing lines.
Our sales engineers offer direct technical support, custom drawing design, and product material matching within 8 hours of inquiry.
We offer online installation support, system troubleshooting, and a one-year warranty on all standard components.
Our products are fully compliant with RoHS, REACH, and WEEE directives, and we use recyclable packaging to support environmental initiatives.
Get answers to common technical, manufacturing, and shipping questions about our copper elbows and fittings.
Explore our additional line of copper elbows, service valves, and specialized refrigeration components.
View the machinery and facility layout where our refrigeration components are manufactured.
Taojun