Explore our premium grade refrigeration line accessories engineered for high system efficiency and long-term durability
Ningbo Taojun Refrigeration Equipment Co., Ltd. is located in the scenic coastal hub of Xiangshan, Ningbo. Established in 1988, our roots trace back to the esteemed Xiangshan Refrigeration Accessories Factory of Zhejiang University. Over the past three decades, we have progressed from a dedicated research-driven facility to an industry-leading high-tech enterprise specializing in design, production, sales, and localized technical support for critical HVAC and refrigeration system assemblies.
Our primary engineering offerings include premium filter driers, check valves, air conditioning valves, condensers, brass flare nuts, brass and copper tube accessories, and durable air-conditioning cable ties. Certified with ISO9001:2015, EU RoHS, and US UL listings, Ningbo Taojun is the trusted OEM/ODM partner for major domestic and international household appliance corporations including Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui.
A technical reference guide for procurement managers, structural design engineers, and industrial system designers
In industrial refrigeration and high-pressure fluid power, the performance of brass flare nuts depends entirely on the metallurgical formulation of the raw bars. Our manufacturing facility utilizes high-density, lead-regulated, and stress-relieved brass alloys including C36000 (Free-Cutting Brass), HPb59-1, and DZR (Dezincification Resistant) Brass.
Standard low-grade brass fittings often exhibit micro-porosity and trace elemental imbalances that lead to stress corrosion cracking (SCC) under cycling temperatures. Ningbo Taojun guarantees minimal copper content of 57%-61% and strict lead distribution metrics, producing an optimal balance between ductile compliance and mechanical strength.
A gas-tight connection requires consistent thread profiles. Our automated Japanese CNC turning centers machine internal and external threads (including standard UNF, NPT, and BSPP formats) to precise Class 2B/6H fit profiles. This high level of machining precision minimizes thread play, allows even torque distribution, and prevents thread galling during system installation.
Hot Forging & Alloy Tempering
Multi-Spindle CNC Precision Threading
Acid Wash & Surface Passivation
CCD Visual & Thread-Gauge Inspection
Internal stress from drawing or cold-forming brass components is a primary cause of premature field failure. At Taojun, all semi-finished brass nuts undergo a controlled thermal stress-relief annealing process. This redistributes internal crystalline stresses without reducing the hardness of the flare face, ensuring structural integrity even under high-torque assembly conditions.
How our brass fittings and refrigeration systems serve critical industries worldwide
High-vibration residential split units, multi-VRF systems, and commercial rooftop HVAC units require flare nuts that maintain connection integrity during temperature changes. Our stress-relieved brass flare nuts prevent refrigerant leaks (e.g., R410a, R32) over long service lives.
In cold storage rooms and refrigerated transport units, brass components are subject to continuous thermal cycling. Our heavy-walled forged brass nuts resist sub-zero embrittlement and maintain joint integrity, protecting cold chain operations.
Automotive cooling systems expose connections to road shock, engine vibrations, and road grime. Taojun's vibration-resistant brass nuts provide durable connections in vehicle air conditioning lines.
Our location in Ningbo's industrial cluster provides access to an established ecosystem of raw copper refiners, surface finishers, and testing laboratories. This concentrated regional supply chain reduces material transit times, minimizes production bottlenecks, and helps buffer against global shipping volatility.
By coupling this regional supply chain with our in-house MES (Manufacturing Execution System) intelligent workshop management, we track production batches from hot-forging to final packing. For global OEM customers, this means short lead times, transparent scheduling, and reliable product consistency.
1998: Factory Expansion
2008: MES Workshop System
2024: CNC Smart Facility
Ensuring product quality through advanced manufacturing equipment and multi-stage testing systems
Our core production machinery and precision high-speed forging systems are sourced internationally to maintain consistent machining performance.
With an R&D team of 15 engineers, including graduates and researchers from the University of Science and Technology of China, we provide specialized design and engineering support.
We source raw copper alloys, high-uniformity liquid crystal spacers, and high-temperature protective films from specialized suppliers in Japan and Europe.
Finished components undergo thermal shock testing (10°C to 90°C), temperature testing (75°C to -35°C for 500 hours), and high-pressure leak testing to verify seal reliability.
Developing lead-free alloys and smart inspection systems to meet evolving international standards
Global initiatives like EU RoHS, REACH, and California Proposition 65 are driving transitions toward low-lead and lead-free alloys. We are actively developing components using lead-free brass alternatives (such as bismuth-brass and silicon-brass) to ensure compliance with NSF/ANSI 372 drinking water and environmental standards.
These lead-free alloys have different machining characteristics than standard free-machining brass. Our engineering team is optimization-testing CNC speeds, tooling geometry, and coolant formulations to maintain high machining tolerances for eco-friendly alloys.
Modern HVAC and refrigeration systems increasingly utilize eco-friendly refrigerants like R290 (propane) and R744 (CO₂). These natural refrigerants operate at higher pressures, which demands stronger connection components.
In response, Ningbo Taojun's R&D is focused on high-pressure forged brass flare nuts designed to handle operating pressures up to 120 bar. We utilize finite element analysis (FEA) to optimize wall thicknesses and minimize material volume, keeping components lightweight but structurally sound.
Our facility is certified under ISO9001:2015 and IATF 16949, ensuring consistent quality across all production lines.
A global brand is sustained by its underlying corporate culture. At Ningbo Taojun, our operations are built on four key pillars: Honesty, Innovation, Responsibility, and Cooperation.
From custom prototyping to lifetime technical support, we help streamline your engineering and procurement processes
Our sales engineers offer detailed technical support, helping you evaluate material specifications, thread sizing, and product tolerances for your specific applications.
We supply custom sizes, non-standard thread configurations, and specialized brass alloys, accommodating custom orders with low minimum order quantities (MOQs).
All products include a one-year warranty, alongside lifetime technical support and a 24-hour response policy for quality inquiries.
Detailed technical answers regarding brass alloys, machining tolerances, thread styles, and system integrations
Browse our selection of specialized HVAC/R parts and tools, manufactured under strict quality standards
Taojun
