Explore our high-performance manufacturing lineup. Precision-sealed valves, custom copper filter driers, and high-strength brass connector fittings built for heavy industrial usage.
In modern fluid transport, thermal management, and HVAC-R (Heating, Ventilation, Air Conditioning, and Refrigeration) configurations, MIP (Male Iron Pipe) hose fittings serve as the foundation of secure, high-pressure interfaces. Despite their historical naming convention referencing "Iron Pipe," contemporary industrial MIP adapters are engineered using high-performance copper alloys and lead-free C37700 brass.
Across America, Europe, and the Middle East, commercial refrigeration units, commercial refrigeration charging lines, and high-pressure chemical transfer systems demand connections that can withstand dynamic stresses. The integration of MIP threads with flared or barbed hose connections allows quick installations that prevent refrigerant leakage, crucial for compliance with global environmental mandates.
As international environmental standards phase out high-GWP (Global Warming Potential) fluorocarbons, fluid systems must operate under higher thermodynamic states. This shift places strict performance demands on structural interfaces: connections must handle intense thermal expansion, pressure cycling, and corrosive environments without degradation.
Established in 1988 as the Xiangshan Refrigeration Accessories Factory of Zhejiang University, Ningbo Taojun Refrigeration Equipment Co., Ltd. has evolved into a global leader in precision copper and brass accessories. Located in the industrial port of Xiangshan, Ningbo, our advanced facility integrates research and development, design, testing, and production.
Recognized as a National High-Tech Enterprise in 2021, Taojun produces critical system components including copper filter driers, check valves, service/access valves, condensers, and custom brass MIP hose adapters.
Through our partnerships with international appliance brands such as Haier, Midea, Whirlpool, Electrolux, and Gree, we have optimized our supply chains to deliver high-volume, zero-defect production runs. Our systems meet ISO 9001:2015, EU RoHS, and UL safety standards.
Why leading global enterprises choose Ningbo Taojun as their long-term manufacturing partner
Our research and development team is staffed by 15 senior design engineers, including doctoral researchers from the University of Science and Technology of China (USTC). This academic foundation enables us to continually design, simulate, and manufacture advanced, high-efficiency connection solutions.
We source our critical automated manufacturing and machining equipment directly from Germany. High-precision CNC Swiss lathes, multi-station automatic forming machines, and computerized laser marking lines ensure consistent tolerances down to ±0.02mm.
Our factory processes are governed by an integrated Manufacturing Execution System (MES) implemented in 2008. From raw material ingestion to final assembly, every stage of production is tracked digitally to ensure 100% material traceability and workflow optimization.
Our quality system is verified by ISO 9001 and IATF 16949 standards. All liquid crystal spacer films are imported from Japan, while our core adhesives are sourced from European specialty manufacturers. Finished components undergo extensive high-low temperature cycles (75°C to -35°C for 500 hours) and thermal shock testing.
To meet zero-leakage standards in high-pressure HVAC-R systems, our brass fittings, check valves, and filter driers undergo automated vacuum helium leak detection, rejecting any unit with a leak rate greater than 1x10⁻⁹ mbar·l/s.
Situated near the deep-water Port of Ningbo-Zhoushan, our facility provides optimized shipping lanes to Europe, the Americas, Southeast Asia, and the Middle East. We support flexible OEM/ODM contract agreements with standard 72-hour fast-track shipments for active product runs.
Empirical technical details confirming our high product quality and reliable performance profiles
| Performance Indicator | Material Spec (Brass Fittings) | Material Spec (Copper Fittings) | Standard Validation Test Protocol | |
|---|---|---|---|---|
| Alloy Designation | HPb59-1, C37700 Lead-Free Brass Option | C12200 Phosphorus-Deoxidized Copper (99.9% Cu) | ASTM B283 / ASTM B88 standard chemical analysis | ISO 9001 Certified Quality Control |
| Maximum Working Pressure | Up to 800 PSI (5.5 MPa) | Up to 700 PSI (4.8 MPa) | Hydraulic burst testing at 3x safety factor | ISO 9001 Certified Quality Control |
| Leakage Limits | < 1x10⁻⁹ mbar·l/s | < 1x10⁻⁹ mbar·l/s | Helium mass spectrometer vacuum chamber test | ISO 9001 Certified Quality Control |
| Temperature Range | -45°C to +150°C | -50°C to +120°C | 500-hour environmental chamber cycle testing | ISO 9001 Certified Quality Control |
| Thread Profiles | NPT, MIP, BSPT, UNF Flare Connections | Solder Joint, Sweat Cup Connections | Go/No-Go thread gauge calibration (tolerance ±0.02mm) | ISO 9001 Certified Quality Control |
| Desiccant Performance | N/A | 3A Molecular Sieve (Water adsorption ≥20%) | Gravimetric analysis for moisture absorption efficiency | ISO 9001 Certified Quality Control |
Our precision fittings and valves operate reliably across diverse commercial, industrial, and residential environments.
Modern variable refrigerant flow (VRF) and inverter mini-split air conditioning systems require leak-free joint stability. Our copper tees, service valves, and brass adapters accommodate high-frequency vibrations and dynamic pressure shifts without structural fatigue, preventing refrigerant loss in multi-zone residential and commercial installations.
In centralized refrigeration display cases, walk-in freezers, and industrial ice makers, keeping systems free of moisture is critical to prevent ice blockages at the expansion valve. Taojun copper filter driers, equipped with high-capacity 3A molecular sieves, continuously absorb trace moisture and acids to protect scroll and reciprocating compressors from failure.
Our heavy-duty charging hoses and brass safety valves are widely used on chemical charging carts and manufacturing lines. Designed to resist chemical breakdown and high temperatures, these assemblies provide safe, secure connections during system evacuations and refrigerant charging.
Positioning our production capabilities to support green energy initiatives and next-generation fluid systems
The global HVAC-R industry is transitioning toward eco-friendly, natural refrigerants like CO₂ (R744), Propane (R290), and Isobutane (R600a). These natural working fluids require higher system design pressures and stricter leak prevention standards. R290 systems, due to their flammability, require spark-free, highly secure physical joints, while CO₂ systems operate at working pressures that exceed 120 bar.
In response to these requirements, Ningbo Taojun is optimizing our manufacturing processes for higher-strength brass alloys and reinforced copper designs. We have developed dual-seal access valves and high-density copper filter driers that provide reliable containment for high-pressure systems.
Additionally, our factory has updated its operations to comply with global environmental standards. Through lead-free brass formulations, recycled raw metal streams, and RoHS/REACH compliance, we ensure that our global buyers receive products that meet regional environmental and safety regulations.
A history of technical growth and manufacturing milestones since 1988
Founded as the Xiangshan Refrigeration Accessories Factory, starting a long-term research partnership with Zhejiang University.
Constructed a dedicated manufacturing facility to expand our production capacity for copper filter driers and refrigeration service valves.
Implemented our MES intelligent workshop management system, introducing digital tracking for material handling and machining processes.
Launched the "Taojun" brand of condensers and shut-off valves, and began supplying major home appliance manufacturers including Haier, Midea, and Gree.
Formally recognized as a National High-Tech Enterprise, expanding our capabilities with 15 senior research engineers and advanced German production equipment.
Expanded our global distribution network, delivering high-pressure brass fittings and valves to OEM customers in over 50 countries.
Our quality management is verified by international standards and third-party certifications
ISO 9001 Certificate
Scope of Registration
Ningbo Taojun Refrigeration operates under registration number 41325Q00065R0S. This registration covers our design and manufacturing processes for copper filter driers, condensers, and access valves. All certifications are verified by the Certification and Accreditation Administration of China (CNCA).
Our internal testing laboratory is equipped to perform critical safety validations, including high-pressure burst testing, helium spectrometry leak detection, and environmental thermal cycling. This testing ensures that our products comply with RoHS, REACH, and UL safety directives, meeting the compliance requirements of global supply chain managers.
Standard support procedures and services for global supply chain partners and OEM engineers
Submit your technical specifications, 2D/3D CAD models, or custom design requirements. Our engineering team will review your application parameters, verify thread dimensions (including NPT, MIP, and SAE flare standards), and provide a detailed manufacturing quote.
Before beginning full production runs, we manufacture prototypes and pre-production samples for client validation. These samples are tested in our environmental testing laboratory to verify their mechanical performance under simulated operating conditions.
Once approved, production is scheduled through our MES system. Raw material batches are matched to production runs, and automated optical inspection and helium mass spectrometry systems check each part to ensure dimensional and seals consistency.
| Procurement Support Service | Detailed Service Capabilities | Response Time & Validation Commitments |
|---|---|---|
| OEM/ODM Customization | Custom sizing, thread styles, materials, and specialized packaging designs. | Initial design review and engineering feedback within 24 hours. |
| Minimum Order Quantity (MOQ) | 500-unit minimum orders for standard products, with flexible terms for custom runs. | Flexible production slots for initial pilot testing and sample approval. |
| Pre-Sales Technical Consultation | Direct collaboration with our R&D engineers to verify material compatibility and design configurations. | Engineering inquiries resolved within 8 hours. |
| Post-Delivery Technical Support | Technical assistance for installations, field troubleshooting, and warranty claims. | One-year warranty with complimentary lifetime technical support. |
Technical guidance and information on MIP hose fittings, copper filters, and refrigeration valves
Explore our additional hardware catalog: condensers, fan motors, welding alloys, and commercial evaporator plates.
Taojun