Explore our certified direct-from-factory refrigeration accessories, access valves, and specialty fittings engineered for global distribution.
Technical whitepaper analyzing the performance parameters and durability considerations for next-generation charging infrastructure.
In contemporary HVAC/R systems, modern refrigerants like R410A, R32, and R290 require unprecedented levels of environmental integrity. As pressures elevate and molecular profiles shrink, traditional elastomeric charging hoses fail to mitigate permeation rates. The modern commercial standard demands high-pressure charging hoses capable of resisting chemical extraction while sustaining structural integrity across a broad spectrum of thermal fluctuations (-30°C to +110°C).
To prevent system contamination and ensure the accuracy of system pressure measurements, charging configurations must maintain gas tightness under high-vacuum servicing phases. Our wholesale distribution channels are dedicated to providing global engineers and field installers with hoses engineered with advanced nylon-barrier technology, safeguarding both environmental compliance and mechanical precision.
Standard rubber hoses lose up to 15.5g of refrigerant per square meter per year under normal HVAC operational loads. Our specialized 4-layered barrier lining drops this permeation level to less than 1.2g/m²/year, effectively protecting diagnostic tools against gas loss and system moisture intake.
| Parameters | Standard Rubber Hose | Nylon Barrier Hose (TAOJUN) |
|---|---|---|
| Working Pressure | 600 PSI | 800 PSI (Max 900) |
| Burst Pressure | 3000 PSI | 4000 PSI |
| Permeation Rate | < 20 g/m²/year | < 1.5 g/m²/year |
| Refrigerant Support | R12, R22, R134a | R134a, R32, R410a, R290, R1234yf |
A granular look at the chemistry and physical structural composition that defines industry-leading AC charging hose performance.
The integrity of a professional HVAC charging hose lies in its cross-sectional layering. Our factory integrates a 4-layered vulcanized co-extrusion technology designed for modern eco-friendly refrigerants:
As the international HVAC industry transitions towards low GWP (Global Warming Potential) options such as R290 (propane) and R744 (carbon dioxide), high pressure and flammability parameters present new hazards. Our engineering roadmap includes the adoption of high-conductivity outer jackets to discharge static buildup, alongside leak-proof brass fittings to keep operations safe.
How our refrigeration accessories perform under the unique environmental pressures of varying global sectors.
Designed to match the high vibrations and confined pathways of modern vehicle engine bays. Ideal for mechanics recharging passenger vehicles with R134a or R1234yf. Quick-connect couplers coupled with flexible hoses ensure low fluid drops during charging cycles.
Operating in sub-zero deep freeze storage facilities requires accessories that remain flexible below -30°C. Our charging lines avoid structural cracking under sudden thermal shifts during standard cold-room maintenance.
High-efficiency variable refrigerant flow systems use advanced electronics and run at higher pressures. Our premium hoses feature robust brass fittings and standard 1/4" to 5/16" SAE adapters, eliminating moisture contamination during vacuum extraction.
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.
Taojun is specialized in refrigeration parts for 38 years. Our core catalog focuses on copper filter driers, access valves, and condensers.
Feature: TAOJUN copper filter driers are designed to absorb moisture and acid, and to filter out system impurities. Normally installed as an original component and replaced as a critical repair part for both domestic and commercial refrigerators, freezers, and industrial HVAC configurations.
Our core manufacturing machinery and high-precision testing configurations are imported directly from Germany to ensure micro-tolerance alignment.
We host 15 experienced research engineers at our local R&D center, including PhDs and specialists working in active cooperation with the University of Science and Technology of China.
Customized lengths, multi-layered chemical linings, custom wall thicknesses, and special coupling sizes are available according to client blueprint drafts.
Our raw materials are strictly screened: ITO film (no shrinkage, zero color difference) and liquid crystal spacers are sourced directly from leading partners in Japan; our temperature tolerance ranges from 70°C to 90°C.
High & low temperature testing is executed at extreme parameters (75°C to -35°C for 500 hours). Thermal shock ranges between 10°C and 90°C. Smart sheet films undergo a full 24-hour aging process, with roll film tests at 100V to ensure absolute zero breakdown.
Verification of our operational compliance according to international standard frameworks.
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.
This certification is verifiable via China’s CNCA (www.cnca.gov.cn) and our partner Zhongci International (www.zcgirz.com). It validates our advanced OEM and ODM capabilities for clients worldwide.
Main Certification Document
Detailed Scope of Certification
Located in the manufacturing powerhouse of Ningbo, Zhejiang province, Taojun leverages a highly integrated logistics framework. Being situated near the Port of Ningbo-Zhoushan—the world’s busiest port by cargo tonnage—allows for rapid international container dispatching.
By maintaining strategic local storage buffers of high-purity copper cathodes and raw elastomeric compounds, we neutralize material price volatility and ensure delivery lead times remain stable. Through our integrated MES (Manufacturing Execution System), production runs are constantly monitored, minimizing downtime and guaranteeing that container-load shipments leave our warehouse on schedule.
Direct answers regarding pressure thresholds, connection protocols, customization parameters, and supply chain logistics.
Our premium AC charging hoses are built to a strict 4:1 safety factor. Standard hoses configured with a working pressure rating of 800 PSI feature a certified burst threshold of 4000 PSI, preventing catastrophic ruptures during high-pressure system purges.
Yes. The inner lining is constructed from extruded polyamide (Nylon-11), which offers chemical compatibility with flammable hydrocarbons. It features a dense molecular layout that prevents refrigerant gas migration through the hose walls.
Absolutely. We provide complete OEM/ODM customization services. We can configure specific fitting shapes (straight, 45-degree, or 90-degree elbows), connection thread pitches (1/4" SAE, 5/16" SAE, or 1/2" ACME), color codings (Red, Yellow, Blue, Black), and print custom company branding directly onto the outer jacket.
Every production batch undergoes automated inline testing. We utilize high-sensitivity helium mass spectrometer leak detection and visual CCD inspections to test joints under pressure, maintaining a defect rate of under 0.05% for global shipments.
Our standard MOQ for wholesale customized hose configurations is 500 units. For stock sizes, the MOQ is highly flexible. Depending on the custom requirements, typical lead times for container orders range from 15 to 30 days, supported by Ningbo Port logistics.
Complete your HVAC servicing package with our highly compatible control valves, fittings, and refrigeration manifold accessories.
Taojun
