Explore our premium selection of highly manufactured refrigeration components, custom brass fittings, and accessories engineered to support industrial climate control systems.
In the rapidly advancing landscape of international HVACR and industrial fluid systems, components like precision brass nuts, valves, and connectors perform mission-critical roles. Even a minor material flaw can compromise system pressure, leading to volatile refrigerant leaks, environmental hazards, and costly downtime.
Utilizing high-purity brass alloys (such as HPb59-1, CW617N, and lead-free configurations) ensuring structural integrity under pressures exceeding 60 bar.
Employing advanced CNC technology with structural tolerances managed down to ±0.02mm, preventing thread galling and mechanical stress cracks.
Engineered to align directly with international quality regimes including CE, RoHS, ISO 9001:2015, and UL standards for seamless component integration.
Founded in 1988, Ningbo Taojun Refrigeration Equipment Co., Ltd. (operating from the picturesque industrial zone of Xiangshan, Ningbo, China) originated as the Xiangshan Refrigeration Accessories Factory of Zhejiang University. Over more than three decades of continuous R&D and rapid infrastructure expansion, Taojun has matured into a comprehensive, high-tech enterprise. Today, we seamlessly integrate product design, advanced engineering, vertical manufacturing, global distribution, and dedicated after-sales support.
In 2021, Taojun was formally accredited as a National High-Tech Enterprise, highlighting our commitment to industrial innovation. Our state-of-the-art facilities produce our market-renowned brand "Lingshan", alongside our highly regarded "Taojun" product lines. Driven by modern manufacturing technologies, our catalog ranges from molecular sieve copper and aluminum filter driers to complex brass fittings, check valves, and high-performance condensers.
Unlocking the performance ceiling of brass nuts and fittings requires rigorous material selection and process controls. The following roadmap outlines the metallurgy and machining technologies behind our OEM components.
Standard commercial brass can suffer from dezincification in wet, acidic, or dynamic conditions, causing porous component failures. Taojun mitigates this by sourcing certified raw materials:
Our imported German CNC lathes and multi-spindle automatic screw machines allow us to achieve tight mechanical tolerances across every batch:
Our shells feature high-purity copper and brass pipe, chosen for outstanding rust resistance and high burst-pressure performance. Standard shells house a specialized 3A molecular sieve (achieving water absorption ≥ 20%) paired with a robust activated carbon layer to capture mechanical impurities and moisture.
Finished components undergo rigorous 500-hour environmental aging tests, enduring temperatures from -35°C to 75°C, thermal shock cycles from 10°C to 90°C, and damp heat validation. Smart sheet components undergo 24-hour active power testing, while rolls are subjected to 100V high-voltage insulation tests.
To assure leak-free performance, Taojun uses automated mass-spectrometer helium leak detectors. Operating under vacuum, these systems verify seals down to leak rates below 1x10⁻⁸ mbar·l/s, providing exceptional quality control.
From residential air conditioners to heavy-duty industrial cold storage, Taojun brass nuts, filter driers, and copper fittings serve as high-performance connectors across key industries.
Integrating seamlessly into domestic freezers and smart refrigerators, our copper filters and brass flare nuts ensure leak-free refrigerant loops for brands like Haier, Midea, and Whirlpool.
Supporting high-duty VRF systems, chillers, and industrial HVAC plants. Our fittings withstand high operating pressures and system vibrations over extended lifespans.
Offering precision adapters, charging hose valves, and structural brass components that resist road salt, vibrations, and high thermal variations.
Custom-machined brass components and check valves configured to route chemical media, pure water, and gases in industrial plants.
Quality is the foundation of our engineering process. As an ISO 9001-certified partner, Taojun operates a comprehensive quality program that governs raw material sourcing through to final dispatch.
Our integrated MES intelligent workshop management system tracks every component batch, tracing raw brass chemical compositions back to their original mills.
We combine high-precision micrometers, profile projectors, and online CCD visual inspection systems to verify that thread profiles and internal bores match designs.
Parts undergo standard salt spray testing to check coating corrosion resistance, alongside pressure burst tests to determine true structural limits.
Juntao Refrigeration (operating under NINGBO TAOJUN REFRIGERATION EQUIPMENT CO., LTD.) is a globally recognized leader in the design and production of critical refrigeration accessories. Holding official GB/T19001-2016/ISO9001:2015 certification (Registration No.: 41325Q00065R0S), we maintain rigorous quality standards across our filter driers, condensers, access valves, and custom brass nuts.
Verified through CNCA and partner auditing portals, our processes support high-efficiency manufacturing, reliable supply chains, and localized design adjustments for partners worldwide.
Quality Management System Certificate
Detailed Scope of Certification
Accredited Testing & Calibration Records
Compliance Document 1
Compliance Document 2
Product Safety Standard & Laboratory Compliance
As a trusted international supplier, Taojun coordinates global transport links and local engineering assistance to ensure smooth system integration for our partners.
We back our projects with 15+ years of pump and refrigeration experience. Our sales engineers deliver 1-to-1 technical guidance, offering responsive design reviews within 8 hours.
With R&D support from Zhejiang University specialists and University of Science and Technology of China researchers, we adapt designs, customize material specifications, and optimize sizes for unique OEM/ODM assemblies.
We provide a one-year warranty on all products and supply lifetime technical support. Our engineers assist with troubleshooting, equipment optimization, and quality reviews to keep your production runs stable.
Get quick answers to common technical, material, and logistics questions from our global HVACR procurement partners.
For high-humidity or mildly acidic applications, we recommend HPb59-1 or CW617N brass. These alloys provide high mechanical strength and strong resistance to dezincification. In corrosive coastal conditions, we also offer custom DZR (Dezincification Resistant) brass alloys to prevent pitting corrosion.
We maintain strict Class 6H thread tolerances using precision CNC machining. This ensures accurate thread contact, preventing galling and reducing stress points under pressure. Additionally, our mating surfaces are machined to a surface roughness of Ra 0.8 or lower, allowing for a tight metal-to-metal seal under standard torque limits.
Yes. All standard brass nuts, fittings, and accessories comply with EU RoHS environmental directives. For projects requiring compliance with Safe Drinking Water acts or Prop 65, we provide lead-free brass formulations that meet these regulatory standards.
Custom prototypes are usually completed within 7 to 14 days, depending on geometry and material requirements. Full production runs typically take 25 to 35 days from blueprint approval to port delivery. Fast-track options are available for urgent supply line needs.
We perform hydrostatic testing on all our valve assemblies and high-pressure fittings. Design validation includes destructive burst testing, verifying that parts can handle working pressures beyond standard operating conditions (often up to 60-80 bar for R410a/CO₂ applications).
Explore more of our high-quality HVACR components, condensers, charging tools, and brass adapters designed for global commercial refrigeration systems.
Taojun
