In the global refrigeration and air conditioning market, the demand for precision flow control components and reliable charge tools has reached unprecedented heights. As the world transitions toward low global warming potential (GWP) refrigerants such as R32, R1234yf, R290, and R600a, the structural integrity of can tap valves and service valves has become a critical bottleneck for safety and efficiency. Can tap valves serve as the foundational interface between small-volume refrigerant canisters and main refrigeration loops, ensuring zero-emission charging operations and mitigating the risks of chemical leaks during field servicing.
Ningbo Taojun Refrigeration Equipment Co., Ltd. has stood at the forefront of this manufacturing transition since its inception in 1988. Leveraging over 35 years of metallurgical research, advanced tooling systems, and continuous product iterations, our company has evolved from a local refrigeration accessories factory into a highly integrated, globally trusted high-tech enterprise. Our core design ethos revolves around mitigating thermodynamic loss and eliminating micro-leakages, ensuring that critical components like stop valves, filters, and safety valves function seamlessly under extreme industrial stress.
Modern HVAC/R infrastructures require clean, moisture-free charging pathways. Moisture contamination in refrigeration lines leads to acid formation, which degrades compressor motor insulation and leads to premature hardware failure. By incorporating can tap valves with integrated safety seals alongside high-absorption copper filter driers, technicians can execute clean gas charges while preventing ambient air intrusion. Taojun's solutions provide standard compatibility with both puncture-style and self-sealing refrigerant cans, conforming strictly to the latest EPA and CARB regulations in the United States, as well as F-Gas standards in Europe.
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. The company's leading products include: filter driers, check valves, air conditioning valves, condensers, brass and copper accessories, air conditioning cable ties and other refrigeration accessories series products. After 30 years of hard work and rapid development, it has now become a comprehensive enterprise integrating the design and development, production and sales, and after-sales service of refrigeration accessories. In 2021, it became a national high-tech enterprise. Our company is committed to technological and process innovation, equipment improvement, and the introduction of advanced management concepts to produce first-class products. Customer satisfaction is our unwavering pursuit. With reasonable design, reliable quality, and perfect after-sales service, the "Lingshan" filter has become a well-known brand in the domestic refrigeration industry. The company has successively passed ISO9001:2008 quality management system certification, EU ROHS environmental protection directive certification, and US UL certification. The company always takes customer needs as the basis and continuously innovates management concepts to ensure efficient and stable development.
In 2012, Ningbo Taojun Refrigeration Equipment Co., Ltd. was established, creating the brand "Taojun" condensers, "Taojun" stop valves and other series of products. Over the years, it has established partnerships with well-known domestic and foreign home appliance enterprises such as Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui. The product sales network covers major and medium-sized cities in China and is exported to Europe, America, South America, Southeast Asia, the Middle East, Africa and other overseas markets. The company's goal is to support and cooperate with every sincere customer to achieve a win-win situation.
Taojun is specialized in refrigeration parts for over 38 years. Our core range focuses heavily on filter driers, access valves, condensers, and premium structural copper accessories. Feature: TAOJUN copper filter driers are designed to absorb moisture and acid, and to filter out impurities. Normally installed as a component and replaced as a repair part for both domestic and commercial refrigerators, freezers, and associated HVAC circuits.
✓ Shell: High-purity copper pipe (rust-resistant, high-pressure resistant, optimized wall thickness for leak-free flaring).
✓ Inner Core: 3A molecular sieve (water absorption ≥20%) + activated carbon layer to target synthetic oil acid residues.
✓ Sealing Process: Advanced argon arc welding and automatic brazing to guarantee hermetic seals and zero pressure drop.
✓ Prolong the Life of the Equipment: Substantially reduces moisture levels, preventing chemical degradation and compressor winding corrosion.
✓ Fast Cooling: Optimizes internal flow geometry, reducing system resistance and accelerating liquid refrigerant cycle velocities.
✓ High Adaptability: Perfect for residential refrigerators, commercial cold stores, and high-vibration automotive A/C circuits.
✓ Refrigerator and freezer repair, field servicing, and custom system assemblies.
✓ Multi-split and residential air conditioning charging, vacuuming, and pressure testing.
✓ Industrial refrigeration rack maintenance, liquid line protection, and mechanical updates.
Our core manufacturing equipment is imported directly from Germany. Automated cutting, punching, flaring, and welding processes ensure dimensional tolerances remain within a strict ±0.02mm limit across all production batches.
We maintain an active, highly specialized R&D center staffed by 15 seasoned engineers, including doctors and professors from the University of Science and Technology of China (USTC). This academic foundation guides our thermodynamic performance mapping and alloy optimization research.
Customized sizes, connections (NPT, SAE, solder, O-ring), and structural body profiles are fully supported. We collaborate directly with appliance manufacturers to develop custom-branded valves and drier systems matched to specific chemical and pressure curves.
All core raw materials undergo rigorous input analysis. Our ITO films (featuring no shrinkage and zero color deviation) and liquid crystal spacers (excellent uniformity) are sourced from Japan; specialized industrial adhesives are imported directly from Europe; our high-performance liquid crystal systems cover a operating window up to 70°C and protective films are heat-resistant up to 80-90°C.
Every batch is subjected to environmental stress tests: high & low temperature baking tests at 75°C and -35°C for 500 consecutive hours; thermal shock tests from 10°C directly to 90°C for 30 cycles; damp heat testing for 500 hours; continuous moisture extraction via industrial convection ovens; and sheet-form films are subjected to 24-hour aging runs. Finished rolls are tested with 100V high voltage to guarantee zero dielectric breakdown.
With an established supply chain and automated high-speed machinery, we support small-batch customization from a minimum order quantity (MOQ) of 500 units up to full-scale multi-million piece contract manufacturing with rapid global shipping options.
In modern industrial refrigeration design, pressure ratings and chemical compatibility dictate safety outcomes. A can tap valve is subjected to cyclic pressure loads, thermal expansions, and mechanical stresses when attached to pressurized liquid lines. If a valve stem is manufactured from poor-grade brass alloy, it can undergo stress corrosion cracking (SCC), resulting in refrigerant escape. Taojun valves are constructed using lead-free brass (C3604/C3771 series) and high-density copper (C12200), ensuring excellent tensile strength and corrosion resistance under highly demanding operational profiles.
Our integrated production loop relies on strict conformance to international standards. The validation of our ISO 9001:2015 registration is a testament to our systematic workflow controls. During manufacturing, every process is traceable via a unique barcode system. CNC machining centers cut and thread brass housings to a precision class of 6H, ensuring that threads interface tightly with charging hoses and canisters to eliminate thread galling and mechanical gas leaks.
The global transition to eco-friendly refrigerants has introduced specific engineering challenges. Refrigerants like R290 (Propane) and R600a (Isobutane) are highly flammable (A3 safety classification). This requires charging components to be completely non-sparking, gas-tight, and designed to prevent electrostatic charge accumulation. Taojun can tap valves utilize double Viton (FKM) O-ring seals, providing a leak-tight seal even under temperature extremes ranging from -40°C to +120°C, ensuring compliance with UL and ATEX anti-explosion standards.
A world brand is supported by a corporate culture. We fully understand that our corporate culture can only be formed through Impact, Infiltration, and Integration. The development of our group has been supported by our core values over the past years: Honesty, Innovation, Responsibility, Cooperation.
Honesty: Our group always adheres to the principle of being people-oriented, maintaining integrity management, prioritizing quality, and securing a premium reputation. Honesty has become the source of our group's competitive edge.
Innovation: Innovation is the essence of our group culture. Innovation leads to development, which leads to increased strength. Our people make innovations in concepts, mechanics, technology, and management, keeping our enterprise prepared for emerging opportunities.
Responsibility: Responsibility enables perseverance. Our group has a strong sense of responsibility and mission for our clients and society. This driving force is felt in every valve we produce.
Cooperation: Cooperation is the source of development. Working together to create a win-win situation is a crucial goal for us, enabling resource integration and mutual complementarity.
- Inquiry and consulting support drawing from 15+ years of pump and refrigeration technical experience.
- One-to-one sales engineer technical service to align specific flow control requirements.
- Active hot-line of service available 24/7, with guaranteed responses within 8 hours.
- Comprehensive technical training, hardware diagnostics, and performance evaluation.
- Professional installation guide, debugging support, and on-site troubleshooting guidance.
- Lifecycle maintenance, upgrades, and continuous product improvement protocols.
- Complete 1-year product warranty with free, lifelong engineering consultation support.
For Precision Refrigeration Components (Filter Driers, Condensers, Access Valves). Juntao Refrigeration (NINGBO TAOJUN REFRIGERATION EQUIPMENT CO., LTD.) stands as a globally recognized leader in the design and production of critical refrigeration components. With our official GB/T19001-2016/ISO9001:2015 certification (Registration No.: 41325Q00065R0S), we demonstrate uncompromising commitment to quality in manufacturing filter driers, condensers, and access valves.
Main Certification Document
Detailed Scope of Certification
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As the international community pushes for net-zero carbon emissions, HVAC/R engineering must adapt to complex operating parameters. Standard mechanical valves are increasingly paired with sensory feedback devices to construct active charging systems. The pressure fluctuations inherent in high-stress heat pumps demand service fittings that maintain an absolute tight seal even during severe compressor vibrations. Taojun's R&D focus actively addresses this trend, designing valves capable of supporting the high pressures of carbon dioxide (R744) systems and the delicate flow curves of variable refrigerant volume (VRV) systems.
Our collaboration with the University of Science and Technology of China focuses on testing how micro-machined internal geometries minimize pressure drop during refrigerant recovery. Minimizing flow turbulence not only reduces fluid dynamics noise but also prevents flash gas formation before the expansion device, preserving system-wide energy efficiency.
Our integrated MES system tracks raw material sourcing, automated machining, dual-stage leak checks, and desiccant baking processes. By ensuring that every copper filter drier leaves our plant with a dew point below -40°C, we protect HVAC compressors from acid buildup, capillary blockage, and oil breakdown. The outcome is a highly robust, clean refrigeration component capable of extending system service lifespans by up to 25%.
35+ years of R&D expertise with Zhejiang University collaboration, leading innovation in metal alloy strength and mechanical flow controls.
ISO 9001, IATF 16949 certified; 5D quality system limiting defect rates to an exceptional 0.05% margin.
Established sales network across 50+ countries; strategic partnerships with Haier, Midea, Whirlpool, Electrolux, and Gree.
Comprehensive OEM/ODM support, matching custom geometries and labels with a low 500-unit MOQ and rapid production cycles.
RoHS, REACH, and WEEE certified manufacturing lines ensuring 100% recyclable components and green packaging.
Automated MES execution, CCD high-speed visual inspection, and ultra-sensitive helium mass spectrometer leak testing.
98.6% customer satisfaction rate (2023 index) with a standard 24-hour response loop for all technical complaints.
±0.02mm tolerances on specialized copper extrusions and foil; rigorous 10-year accelerated lifetime fatigue testing.
Focused development of smart flow controls and eco-friendly valves to support global HVAC/R green initiatives.
Puncture-style can tap valves feature a sharp hardened steel needle that pierces the metal seal on traditional single-use refrigerant cans, allowing the gas to flow. Once pierced, the valve must remain attached until the can is completely empty to prevent leakage. Self-sealing can tap valves are designed to press down on a spring-loaded internal valve in modern, reusable cans. They allow the user to connect and disconnect the valve at any time without releasing remaining refrigerant, aligning with environmental regulations such as the US EPA guidelines designed to prevent fluorocarbon emissions.
We implement a dual-stage quality protocol. First, all structural bodies are forged and machined from high-density brass and C12200 copper, avoiding micro-porosity defects. Second, the internal seal design uses double-layered FKM (Viton) O-rings, which maintain high elasticity and seal integrity under higher pressures (R32 systems operate at pressures up to 4.3 MPa, which is roughly 1.6 times higher than R22 systems). Every valve undergoes automated high-vacuum helium mass spectrometer leak detection before packaging.
Purchasing managers must match the copper filter drier size (typically ranging from 10g to 50g for domestic applications) to the compressor system's total cooling capacity. Key parameters include the inlet and outlet connection sizes (e.g., 1/4" or 3/8" solder or flare), molecular sieve composition (3A molecular sieves are standard for HFC/HCFC systems, while 4A molecular sieves are utilized for specific industrial fluids), and moisture absorption capacity. Incorporating activated carbon is recommended for systems using POE or PVE oils to capture acidic impurities.
Yes, all Taojun copper fittings, brass service valves, and filter driers are fully certified under the EU RoHS Directive and REACH regulations. Our production processes exclude hazardous substances such as lead, mercury, hexavalent chromium, and specific phthalates, making our components safe for global distribution and integration into appliances intended for markets with strict environmental standards.
As a leading high-tech manufacturer, we support comprehensive OEM/ODM projects. Our R&D center, staffed by USTC graduates and 15 senior engineers, works with technical drawings (CAD, STP, IGS files) to develop prototype molds. We produce custom thread sizes, localized connection lengths, custom materials (such as nickel-plated brass or specialized copper alloys), and provide laser-marked branding on the valve body.
Moisture inside a refrigeration loop can freeze at the expansion valve, blocking the refrigerant path and causing system failure. Moisture also reacts with refrigerants and compressor oils to form highly corrosive acids, which degrade copper pipes and damage motor windings. Taojun filter driers use high-performance desiccants to actively capture moisture and neutralize acids, keeping the system clean and protecting vital compressor components.
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