Explore our core product lineup engineered for industrial, commercial, and residential HVAC/R applications. Direct factory dispatch with globally verified certifications.
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 30 years of continuous growth, we have evolved into a national high-tech enterprise integrating R&D, design, advanced manufacturing, and global after-sales support.
Our leading portfolio includes: high-pressure access valves, premium filter driers, check valves, air conditioning valves, condensers, brass/copper fittings, and air conditioning installation accessories. We have established strategic, long-term partnerships with domestic and international giants, including Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui.
Equipped with a core R&D center staffed by doctoral researchers and university professors, Taojun is committed to driving zero-leakage, high-performance fluid control technologies for the next generation of refrigeration infrastructure.
Why Tier-1 HVAC/R brands trust Ningbo Taojun for their critical system component requirements.
Founded as a Zhejiang University partnership, our R&D center houses 15 senior engineers, including PhDs and professors, ensuring continuous design innovation and material science leadership.
Our core production equipment is imported from Germany, integrated with proprietary MES systems, CCD visual inspection, and automated leak detection for zero-defect output.
We strictly comply with standard systems. Verified credentials include ISO9001:2015, IATF 16949 for automotive cooling parts, CE, US UL, and full EU RoHS/REACH environmental compliance.
Leveraging technical expertise and global supply capacity to keep systems sealed worldwide.
A technical examination of hermetic seals, refrigerant containment, and durability in high-vibration environments.
Access valves (commonly referred to as Schrader valves in HVAC/R applications) serve as the primary gateway for diagnostic evaluation, system evacuation, and refrigerant charging. Under standard operation, these micro-components are subjected to extreme thermal cycles, high system pressure, and continuous structural vibration from compressors.
Taojun access valves are engineered to bypass standard failure points by utilizing premium brass housings and high-purity copper tube extensions (conforming to ASTM B280). The internal valve cores feature specialized synthetic elastomers (such as Neoprene or HNBR) specifically formulated to resist long-term degradation from synthetic oils (POE, PAG) and modern eco-refrigerants.
| Component Parametrics | Material Specification | Maximum Pressure Rating | Refrigerant Compatibility | Standard Certifications |
|---|---|---|---|---|
| Standard Access Valve | C3604 Brass / ASTM B280 Copper | 800 PSI (55 Bar) | R134a, R410A, R32, R407C | UL, RoHS, ISO9001 |
| Triple-Sealed HVAC Valve | Reinforced HPB59-1 Brass | 1000 PSI (68 Bar) | R410A, R32, CO2 (Sub-critical) | UL, CE, REACH |
| Copper Capillary Assemblies | TP2 Deoxidized Copper | Up to 1200 PSI | All Common Halocarbon Formulations | ISO9001, RoHS |
| Copper Filter Driers | TP2 Copper, 3A Molecular Sieve | 650 PSI | R134a, R600a, R290, R404A | UL, CE |
Adapting HVAC/R service ports for future eco-friendly refrigerants and smart diagnostic ecosystems.
As the HVAC/R industry transitions toward ultra-low GWP refrigerants such as R290 (Propane) and R744 (CO2), system operational pressures and flammability parameters increase. Taojun is actively engineering reinforced brass access ports capable of withstanding pressures exceeding 120 Bar, maintaining hermetic sealing integrity under rapid temperature swings.
Our future engineering roadmap includes the conceptualization of access points with embedded sensors. These smart access valves will enable wireless telemetry of system pressure and temperature values, eliminating the need for technicians to hook up manifold gauges and risk venting refrigerant charge into the atmosphere.
Improving joint reliability at the factory level. By utilizing advanced metallurgy and pre-placed alloy rings, our latest access valve assemblies allow automated induction brazing processes to yield completely consistent, flux-free, bubble-tight copper joints.
Operating a production center in Ningbo, Zhejiang, Taojun has integrated digital manufacturing protocols to safeguard production capacity and product consistency for global clients.
Through our proprietary MES (Manufacturing Execution System) workshop management program, every batch of copper raw material is tracked from arrival, chemical assay confirmation, CNC machining, through to pressure decay testing and helium leak detection. This digital integration guarantees that lead times are compressed, and customized OEM/ODM components can be dispatched within strict scheduling agreements.
Our strategic proximity to the Port of Ningbo, the world's busiest container port, ensures seamless shipping logistics, lowering transport overheads and securing steady supply pipelines for international appliance manufacturers.
Streamlined logistics, raw material traceability, and multi-market certifications to facilitate painless integration.
Tier-1 procurement demands technical excellence, scalable volume pricing, and flawless regulatory compliance. We provide complete material certification packages (EN 10204 3.1) and implement rigorous quality tools including FMEA (Failure Mode and Effects Analysis) and SPC (Statistical Process Control) to match standard automotive and industrial requirements.
Additionally, we supply custom-engineered solutions for varying environmental conditions. For instance, our access valves intended for coastal locations utilize marine-grade DZR (Dezincification Resistant) brass alloys to prevent stress corrosion cracking in saline environments.
ISO 9001:2015 Main Certificate
Certified Production Scope
National High-Tech Enterprise Certificate
Operational principles designed to optimize performance, minimize defect rates, and secure reliable project delivery.
Leveraging 35+ years of R&D expertise alongside ongoing research partnerships with Zhejiang University.
Implementing ISO 9001 and IATF 16949 parameters with a 5D quality verification system targeting a 0.05% defect rate.
Serving clients in over 50 countries, including partnerships with Haier, Midea, Whirlpool, and Electrolux.
Flexible sizing, material optimization, custom packaging, and flexible MOQs from 500 units.
Compliance with RoHS, REACH, and WEEE directives, featuring green processes and 100% recyclable packing materials.
Equipped with computerized testing labs, helium leak spectrometers, and advanced CCD dimensional inspection cameras.
From micro-electronics cooling to massive industrial refrigeration units, Taojun parts deliver absolute reliability.
In-depth insights regarding material selection, installation parameters, and system integration.
Explore our extended catalog of accessories, adapters, and refrigeration parts designed for durability and ease of installation.
Taojun