Explore our core selection of certified, industry-standard copper, brass, and refrigeration system accessories.
A comprehensive technical analysis of metallurgy, structural design, and precision manufacturing in high-pressure environments.
In modern industrial refrigeration, HVAC/R control units, and fluid management systems, the integrity of threaded connections dictates the safety and efficiency of the overall network. A brass tank nipple functions as a critical conduit adapter connecting heavy-duty storage tanks, accumulators, and pressure vessels to complex external piping networks. High-vibration environments, coupled with aggressive refrigerants and fluid pressure spikes, demand unparalleled mechanical properties from these connectors. That is why wholesale procurement managers rely on custom-engineered, dezincification-resistant (DZR) brass alloys designed to survive corrosive cycles and thermal stresses.
We source heavy-duty C36000 and lead-free C87850 brass. This chemical makeup offers optimized tensile strength, excellent resistance to stress corrosion cracking, and superior machinability on multi-axis CNC machines.
In aqueous or humid installations, traditional brass can suffer from zinc leaching. Our proprietary heat-treatment process forms a protective phase configuration that locks in alloy stability under aggressive environmental moisture.
Engineered to precise ASME B1.20.1 (NPT) and ISO 228-1 (G) parameters, ensuring gas-tight sealing and simplified torque calculations during onsite assembly for plumbing and refrigeration professionals.
Ningbo Taojun Refrigeration Equipment Co., Ltd. - Bridging Precision Engineering and Global HVAC/R Success Since 1988.
Founded in 1988 as the Xiangshan Refrigeration Accessories Factory of Zhejiang University, Ningbo Taojun Refrigeration Equipment Co., Ltd. has evolved over three decades into a nationally recognized high-tech manufacturing leader. Centered in the scenic industrial hub of Xiangshan, Ningbo, our facility houses some of the most advanced technology in refrigeration component development.
Our core focus is the specialized production of high-grade copper and brass refrigeration components, including filter driers, check valves, air conditioning valves, wire-tube condensers, capillary tubes, and custom brass tank nipples. Over decades of refinement, the company established its signature domestic brand, "Lingshan", while earning internationally recognized credentials including ISO 9001:2015, EU RoHS, and US UL certifications.
Specialized Engineering for Refrigeration, HVAC, & Fluid Piping Components
Taojun specializes in refrigeration components and fluid connection engineering. For over 38 years, our manufacturing facilities have engineered specialized parts built to solve thermodynamic containment challenges. Our copper filter driers are designed to absorb systemic moisture and acid while filtering out fine particulate impurities. Installed standard in domestic and commercial refrigeration, freezers, heat pump networks, and heavy-duty storage tanks, our brass and copper parts secure long-term compressor safety.
Engineered with 3A molecular sieves + activated carbon to secure high water absorption capacities (≥20%), preventing ice blockages and capillary line corrosion.
We leverage automated argon arc welding and helium leak mass spectrometer tests to guarantee zero leak pathways in every high-pressure brass and copper connection.
Custom lengths, precise wall thickness profiles, and specific alloys are manufactured per system requirements, supporting high flexibility for custom production batches.
A Strong Legacy of R&D, Hi-Tech Manufacturing, and Zero-Defect Quality Control
Our core production machinery is imported directly from Germany to ensure sub-micron level machining tolerances for threads and joint geometries.
Our R&D center is staffed by 15 advanced engineering professionals, including doctors and researchers from the University of Science and Technology of China.
Flexible manufacturing design enables the adjustment of sizing, metallurgical profiles, and threads, converting concepts to industrial-grade products seamlessly.
We source Japanese ITO film and high-purity copper and brass billet. All sealants are imported from Europe to ensure consistent chemical resistance under thermal shocks.
Every batch undergoes thermal shock testing (10°C to 90°C), temperature aging tests (-35°C to 75°C for 500 hours), and high-voltage 100V breakdown checks to guarantee 100% reliability.
Unlocking logistics efficiency, raw material integration, and high manufacturing capacities.
For global industrial distributors and OEM HVAC brands, sourcing heavy-duty components from China offers significant strategic advantages. Located in Ningbo, Zhejiang, our factory benefits from one of the world's most integrated industrial manufacturing ecosystems. Ningbo's deep-water port facilities allow us to streamline transit times to North America, Europe, and Southeast Asia. The local abundance of high-purity copper and brass refineries, combined with precision CNC tooling ecosystems, ensures that raw material price fluctuations are kept to a minimum.
Global procurement teams prioritize security of supply, scale capacity, and consistent quality. By using advanced MES (Manufacturing Execution System) monitoring, our production lines easily scale from small custom OEM runs to high-volume standard component production. This ensures stable unit costs, low delivery times, and the engineering support needed to maintain global HVAC/R pipelines.
Where Precision Brass Tank Nipples & Copper Accessories Excel
Our brass fittings, copper filter driers, and custom adapters are engineered for high performance in challenging environments. The mechanical resilience of brass is critical in preventing stress cracking, high vibration issues, and corrosion. Below are key systems where our parts are installed:
Installed standard in household refrigerators and deep freezers to maintain long-term desiccant filtration and keep moisture away from the compressor loop.
Used in heavy-duty commercial cold storage evaporators and condenser units to withstand thermal shock cycles and continuous vibrations.
Specially engineered low-tolerance connectors built to resist automotive engine heat, mechanical stress, and aggressive refrigerants like R134a.
Integrated into industrial chemical fluid loops, water treatment facilities, and liquid storage tanks where secure, leak-proof connections are required.
Decades of engineering evolution, structural expansion, and core institutional values.
Established as Xiangshan Refrigeration Accessories Factory of Zhejiang University, setting down robust academic and engineering foundations.
Relocated to custom facility buildings to expand heavy manufacturing capabilities for copper refrigeration adapters and valves.
Introduced MES intelligent workshop management systems, standardizing tolerances and integrating traceability throughout the supply chain.
Registered the specialized "Taojun" brand of high-performance condensers and valves, initiating direct export operations to over 50 countries.
Acquired National High-Tech Enterprise status and integrated direct collaboration with China's top material science institutes to develop advanced DZR brass alloys.
Honesty: Integrity-focused client management, product transparency, and a quality-first manufacturing mindset form the core of our business relationship strategy.
Innovation: Continuously refining concept design, material metallurgy, manufacturing automation, and service systems to deliver advanced products for global markets.
Responsibility: Strict compliance with local regulations, low carbon waste, zero environmental compromise, and full engineering support across product lifespans.
Cooperation: Building close OEM and distribution partnerships to share market insights and achieve mutual long-term success.
Verified Quality Management Systems Operating to Strict International Standards
To operate seamlessly in global markets, HVAC/R products must comply with strict localized certifications. Juntao Refrigeration (Ningbo Taojun Refrigeration Equipment Co., Ltd.) maintains certified production lines that comply with international safety, environmental, and material standards. Under registration number GB/T19001-2016/ISO9001:2015, our quality management system covers all stages from design to production and testing of filter driers, condensers, and access valves.
Our components comply with European and North American standards to simplify import processes. Our production facility provides direct trace reporting for:
Main Certificate
Certification Scope
Comprehensive technical answers to help purchasing managers and HVAC engineers optimize their sourcing.
We manufacture our tank nipples primarily from C36000 Free-Cutting Brass, which offers excellent machinability and durability, and lead-free C87850 brass for applications that require compliance with NSF/ANSI 372 standards for drinking water and localized environmental regulations.
Yes, our multi-axis German CNC machines can produce custom thread forms. We can manufacture components to ASME B1.20.1 NPT, ISO 228-1 G (BSPP), BS 21 BSPT, and specific metric thread configurations based on your technical drawing requirements.
Every batch of our brass and copper components undergoes helium mass spectrometer leak detection and thermal pressure cycling tests. Our production processes limit systemic defect rates to under 0.05%, ensuring reliable sealing under high-pressure conditions.
For standard copper filter driers and brass adapters, the minimum order quantity (MOQ) is 500 units. For custom machined OEM/ODM tank nipples, MOQ is determined by the size and material specifications. Standard production lead times average 2 to 4 weeks depending on the order size.
Yes, Ningbo Taojun has held official EU RoHS environmental compliance certification for years. We provide complete material declaration sheets detailing composition levels to verify safety and regulatory compliance.
Premium OEM/ODM products manufactured for global supply chains.
Detailed view of our core refrigeration parts and fittings lines.
Taojun