The global refrigeration and air conditioning (HVAC/R) industry is undergoing a structural paradigm shift driven by stringent carbon neutrality targets, the phasedown of high-GWP (Global Warming Potential) hydrofluorocarbons (HFCs), and the transition toward natural and low-GWP alternatives such as R32, R290, and CO2 (R744). In this highly regulated landscape, the mechanical integrity of system access points—specifically can tap valves, split service valves, and process charging ports—has emerged as a mission-critical factor in preventing micro-leakage, ensuring environmental compliance, and maintaining optimal system efficiency.
Industrial and commercial refrigerating systems operate under volatile pressure-temperature cycles. Even negligible refrigerant leaks compromise the Coefficient of Performance (COP), escalate energy consumption, and risk non-compliance with regional directives such as Europe’s F-Gas Regulation and EPA Section 608 in the United States. High-quality can tap valves serve as the direct gateway interface for charging, evacuation, and maintenance operations. As a global leading supplier and manufacturer, Ningbo Taojun Refrigeration Equipment Co., Ltd. addresses this industry demand by engineering heavy-duty, zero-emission flow control interfaces that safeguard hermetic system circuits across their entire lifecycles.
Micro-leakages at charging connections are responsible for up to 15% of annual refrigerant losses in automotive and domestic equipment. Taojun's specialized split service valves and can tap components employ premium alloyed brass, customized nitrile/PTFE elastomer seals, and precision-machined threads to ensure gastight seating under high working pressures up to 60 bar.
Founded in 1988, Ningbo Taojun Refrigeration Equipment Co., Ltd. (formerly the Xiangshan Refrigeration Accessories Factory of Zhejiang University) has spent more than three decades establishing itself as a pinnacle of engineering excellence in refrigeration accessories. Located in the coastal industrial hub of Xiangshan, Ningbo, our facility occupies a strategic geographic corridor, enabling streamlined shipping access to major international trade routes via Ningbo-Zhoushan Port.
Our core expertise spans the research, development, and manufacturing of critical components, including copper filter driers, check valves, air conditioning split service stop valves, condensers, brass/copper fittings, and HVAC accessory lines. Designated as a National High-Tech Enterprise in 2021, Taojun has forged long-term manufacturing partnerships with prominent global brands, including Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui. Our domestic and international sales networks cover major global markets across Europe, the Americas, Southeast Asia, the Middle East, and Africa.
We utilize high-purity brass (HPb59-1 or Lead-Free C36000 compliant) and seamless copper extrusions (C12200, ≥99.9% Cu) to produce stop valves and split service ports. This provides superior resistance to stress corrosion cracking, high thermal expansion capability, and compatibility with standard brazing techniques used during outdoor AC installation.
Integrating moisture absorption directly into system lines, our copper filter driers utilize a premium 3A molecular sieve. This sieve has a pore diameter of 3 Angstroms, selectively adsorbing water molecules (approx 2.8 Å) while completely excluding refrigerant molecules like R134a or R600a, maintaining system purity without chemical degradation.
Every split service stop valve and service port is engineered with double O-rings (HNBR or FKM) and metal-to-metal back seating options. Hand-adjusted thread tolerances are machined within ±0.02mm, avoiding thread-gall and guaranteeing complete closure under high pressure and vacuum stages.
| Valve Component | Material Spec | Max Operating Pressure | Refrigerant Compatibility | Quality Test Metric |
|---|---|---|---|---|
| Can Tap Valves | Forged Brass HPb59-1 / Hardened Steel Pin | ≥ 40 Bar | R134a, R1234yf, R22, R410A | 100% Helium Leak Tested (< 1x10&sup7; mbar.l/s) |
| Split Service Valves | Extruded Brass / High Purity Copper L-Bend | ≥ 60 Bar | R32, R410A, R290, R407C | Burst Test > 180 Bar / Salt Spray 72h |
| Copper Filter Driers | C12200 TP2 Copper Shell / 3A Sieve | ≥ 45 Bar | Universal HFC, HCFC, HC systems | Vacuum Drying / Argon-Arc Welded Seams |
| Brass Access Fittings | Free-Cutting Brass C3602 / Schrader Core | ≥ 55 Bar | Universal Compatibility | Mechanical torque cycle testing (1,000 cycles) |
At Taojun, we recognize that technological superiority is the foundation of product reliability. Our state-of-the-art research and development center operates in cooperation with Zhejiang University, bringing academic knowledge to commercial refrigeration challenges. Our engineering division is staffed by 15 senior design and application engineers, including doctorate and professorial level experts from the prestigious University of Science and Technology of China (USTC).
This deep pool of expertise allows us to offer custom OEM and ODM services. We produce components tailored to exact client requirements, accommodating non-standard port diameters, specific pressure ratings, and custom refrigerant charging paths. We translate client schematics into production-ready physical components with rapid prototyping capabilities.
Our production floor features specialized manufacturing equipment imported directly from Germany, ensuring precise metal forging, thread cutting, and automated assembly operations. We integrate an advanced MES (Manufacturing Execution System) to track batch processing in real time. Quality validation is supported by automated optical inspection (CCD visual inspection) and leak-detection systems.
To ensure durability in harsh conditions, our components undergo a rigorous testing program:
Taojun can tap valves, access fittings, and filter driers are implemented across various commercial, residential, and industrial cooling configurations worldwide.
In logistics systems and commercial supermarket displays, maintaining consistent sub-zero temperatures is essential. Our heavy-duty copper filter driers and service access ports are installed to prevent acid buildup and blockages, protecting high-capacity hermetic scroll compressors from damage.
Mobile A/C systems experience constant vibration and thermal cycling. Taojun can tap valves provide safe, leak-free connection points for charging and servicing automotive systems with R134a and R1234yf refrigerants, preventing accidental discharge into the atmosphere.
For residential heating and cooling, split service valves control refrigerant flow between indoor evaporators and outdoor condenser units. Our brass split valves enable clean installation and vacuum testing, contributing to seasonal energy efficiency ratings (SEER).
Operating in Ningbo, Zhejiang province—the heart of China's refrigeration component manufacturing cluster—Taojun leverages an integrated local supply chain. This concentration of raw material processors, specialized tooling shops, and surface treatment facilities allows us to source high-grade brass and copper efficiently, insulating our operations from sudden market fluctuations.
Our close proximity to the Ningbo-Zhoushan Port—one of the world's busiest container terminals—translates directly to logistics advantages for our clients. We offer shorter transport routes, lower inland freight costs, and flexible shipping schedules. Backed by automated inventory control and optimized production lines, we support a standard MOQ of 500 units, enabling distributors and OEMs to manage lean inventory levels while maintaining supply security.
Our MES software tracks every stage of production, from raw brass billet allocation to final helium leak validation, enabling traceability for industrial audits.
We maintain reserves of high-purity copper and brass tube stock, buffering our clients from pricing volatility and ensuring consistent delivery times during peak seasons.
Every shipment is packed in hermetically sealed plastic barriers with desiccant packs, wrapped in heavy-duty multi-layer corrugate, and palletized to prevent moisture ingress or thread damage during transit.
Established in cooperation with Zhejiang University, initiating technical research into filtration, desiccant properties, and copper line configurations.
Implementation of shopfloor MES software, upgrading quality tracking systems to meet ISO9001 and international export standards.
Consolidated our product lines under the "Taojun" brand. We established supplier partnerships with Haier, Midea, Gree, Whirlpool, and Electrolux, and began exporting to Europe and the Americas.
Officially recognized by the government for our technical innovation and R&D achievements. We introduced automated assembly systems, integrated helium-leak test beds, and expanded our design capabilities.
Our manufacturing operations follow an audited Quality Management System, ensuring compliance with global regulatory and safety standards.
Ningbo Taojun Refrigeration operates in accordance with standard GB/T19001-2016 / ISO9001:2015 (Registration No.: 41325Q00065R0S). This certification covers our design, development, and manufacturing of filter driers, condensers, and access valves. It is registered and verifiable through China's CNCA database (www.cnca.gov.cn).
We align our processes with the automotive-grade IATF 16949 framework, maintaining a 5D quality improvement system. Our products comply with the EU RoHS environmental directive and carry US UL safety certifications. These standards verify our capabilities as an OEM/ODM partner for high-precision refrigeration accessories.
We support our partners with comprehensive services, from pre-purchase planning to technical after-sales support:
Our technical sales engineers review custom specifications and design parameters. Dedicated customer support is available 24/7, with a standard response time of under 8 hours.
We provide detailed technical documentation, installation instructions, and troubleshooting guides. All physical components are backed by a one-year warranty, along with lifetime engineering support.
Taojun
