Explore our industrial-grade refrigeration and cooling line components, designed to meet the rigorous demands of global distributors and OEM systems.
Unlocking value in critical connections: The role of high-integrity brass coupling nuts and copper hardware in modern HVAC/R systems.
Modern commercial refrigeration demands lead-free brass (e.g., C36000, HPb59-1) to withstand aggressive new refrigerants and strictly comply with environmental regulations such as RoHS and REACH. Industry-standard brass coupling nuts ensure zero dezincification under high moisture and chemical exposure.
With thread pitch accuracy up to class 6H/6g, precision-machined brass coupling nuts eliminate gas bypass and system leaks in high-vibration compressor modules. Precision micro-inch thread finishes are critical to maintaining structural torque under extreme temperature oscillations.
Global procurement teams favor manufacturers utilizing Helium mass spectrometry and high-pressure nitrogen testing to verify the structural integrity of fittings. Ensuring that accessories like valves and brass couplings can sustain up to 500 PSI under operational stress is paramount.
Ningbo Taojun Refrigeration Equipment Co., Ltd. is located in Xiangshan, Ningbo, a beautiful tourist city. Founded in 1988, its predecessor was Xiangshan Refrigeration Accessories Factory of Zhejiang University. Over the course of more than 35 years of dedicated manufacturing, the enterprise has evolved into a national high-tech enterprise (certified in 2021) that integrates the design, development, production, sales, and comprehensive after-sales service of key refrigeration accessories.
The company's core portfolio features high-performance filter driers, check valves, air conditioning valves, condensers, brass and copper accessories, and air conditioning cable ties. Known domestically and internationally under our flagship brand "Lingshan", our products have earned a formidable reputation for robust design and structural longevity.
Empowering global enterprises with advanced automation, stringent quality control, and strategic R&D partnerships.
Our core production facility leverages heavy machinery imported directly from Germany, enabling high-rate repeatable accuracy. This investment guarantees micron-level tolerance compliance for all copper filter drier bodies and complex brass coupling nut threads.
We host a state-of-the-art R&D center staffed by 15 senior research engineers, including doctors and professors from the University of Science and Technology of China (USTC). This academic foundation accelerates product testing and process optimization.
Implemented in 2008 and consistently upgraded to align with Factory 4.0, our MES intelligent workshop management system tracks every component batch. From raw copper rod feed in the workshop to final pressure validation, accountability is digital.
We utilize certified premium-grade liquid crystal spacers and ITO film directly imported from Japan, together with European high-grade industrial glues, maintaining structural stability up to 80-90°C.
Finished parts undergo extensive high/low temperature cycles (from -35°C to 75°C for 500 hours), thermal shock trials (10°C to 90°C), and 24-hour electrical/pressure aging sweeps to eliminate initial failure rates.
Ningbo Taojun holds official GB/T19001-2016 / ISO9001:2015 registration (No. 41325Q00065R0S), certified through CNCA and Zhongci International, guaranteeing strict alignment with IATF 16949 standards.
For decades, we have acted as an OEM/ODM supplier for global industry giants including Gree, Midea, Haier, Whirlpool, Electrolux, Huarui, and Xinfei, ensuring secure supply channels.
A breakdown of our manufacturing specifications, showing why our components resist moisture, corrosion, and high pressures.
Ensures maximum corrosion resistance, robust tensile strength, and seamless brazing compatibility with refrigeration system pipelines.
Constructed with 3A Molecular Sieve (moisture capacity ≥ 20%) combined with an activated carbon layer to neutralize acids and screen debris, preventing capillary blockages.
Executed via automated orbital welding stations to guarantee leak-free joints, maintaining hermetic sealing under pressures up to 500 PSI.
Both external access valves and brass coupling nuts undergo auto-gaging processes to ensure smooth installation and resistance to mechanical thread stripping.
Tracing our path from a specialized academic workshop to an automated global HVAC/R hardware supplier.
Our initial production facilities was constructed in Xiangshan, Ningbo, solidifying our engineering partnership with the refrigeration accessories division of Zhejiang University.
Transitioned to data-driven manufacturing by implementing our first MES intelligent workshop management system, ensuring traceability of batch raw materials and manufacturing logs.
Upgraded our automated production lines with CCD visual inspection and robotic machining centers to meet the demand for precision brass couplings and complex refrigeration assemblies.
How our precision components perform across diverse commercial, residential, and industrial systems.
Providing custom copper filter driers (10g, 15g, 20g) and brass fittings to domestic refrigerators and freezers, ensuring long system lifespans for consumer brands like Haier and Midea.
Delivering high-pressure rated access valves, 500 PSI triple-sealed valves, and U-bend fittings designed to withstand the operational cycles of large commercial cooling units and building chillers.
Supporting precision machining tolerances for automotive air conditioners, where vibration resistance and leak-proof thread connections are critical for safety.
Our heavy-duty condensers and desiccant dryers provide critical protection against moisture and acid corrosion in transport refrigeration and food warehousing systems.
Technical guidance from our senior engineering team on product selection, materials, and system reliability.
Brass (specifically premium alloys like C3604 or lead-free HPb59-1) offers excellent corrosion resistance, superior thermal expansion matching with copper tubes, and reliable ductility. Unlike steel, it does not rust or seize, ensuring easy maintenance and a leak-proof metal-to-metal seal under vibration.
Every copper filter drier is thoroughly oven-dried before automated assembly. The ends are hermetically sealed with custom rubber plugs or welded shut to prevent atmospheric air from degrading the 3A molecular sieve's absorption capacity.
Our access and stop valves are subjected to helium leak detection at pressures exceeding 500 PSI. We run periodic high/low temperature cycle tests (75°C to -35°C for 500 hours) to verify seal elasticity and thread stability under thermal stress.
Yes. Supported by our CAD/CAM tool design capabilities and USTC-backed R&D center, we can produce custom dimensions, thread types (NPT, UNF, BSP), and geometry variations to match client specifications with a standard MOQ of 500 units.
Our production facilities operate under ISO 9001 and RoHS frameworks to guarantee compliance for global shipments.
Main Certification Document
Detailed Scope of Certification
ISO9001:2015 Registry
UL Compliance Certificate
Explore our secondary lineup of air conditioning valves, copper filters, vacuum tools, and high-performance components.
Taojun