Explore our core product line featuring high-durability capacitors, HVAC copper assemblies, control units, and refrigeration system components.
The global transition toward high-efficiency HVAC systems and variable-frequency motors has placed unprecedented performance requirements on passive components. Round capacitors, specifically metallized polypropylene film models (run capacitors) and aluminum electrolytic starter models, represent the pulse of modern commercial and domestic electrical architecture. Operating as energy storage buffers and phase-shifting units, they are indispensable for compressor start-ups and motor operation across domestic, automotive, and industrial refrigeration.
Currently, the international market is defined by a shift from simple mechanical configurations to highly responsive, electronically stabilized grids. This transformation requires round capacitors that can withstand volatile thermal loads, frequent line-voltage transients, and high-frequency harmonics without experiencing dielectric breakdown. Consequently, leading global procurement managers focus on sourcing suppliers capable of delivering structural integrity, self-healing technologies, and strict adherence to international safety certifications such as UL 810, CE, and RoHS.
Ningbo Taojun Refrigeration Equipment Co., Ltd. (formally known as the Xiangshan Refrigeration Accessories Factory of Zhejiang University) is nestled in the manufacturing and tourist hub of Xiangshan, Ningbo, China. Over a span of more than three decades, Taojun has transformed from a specialized university-backed research factory into a global enterprise integrating research and development, design, manufacturing, quality control, and after-sales support.
Recognized officially as a National High-Tech Enterprise in 2021, the company manages a diverse catalog of high-precision refrigeration accessories. Beyond our leading-edge filter driers (commercially recognized under our domestic signature "Lingshan" brand), we manufacture stop valves, condensers, and brass fittings. To ensure our clients maintain a competitive edge, we have modernized our operations by integrating advanced MES workshop systems, helium leak detectors, and automated assembly equipment imported directly from Germany.
Our industrial dominance is backed by systematic investments in high-tier engineering equipment, rigorous scientific processes, and quality control.
Core manufacturing lines and automated detection apparatuses are imported directly from Germany, assuring repeatable precision and high throughput rates.
Our engineering team includes 15 expert engineers, working in collaboration with prominent academic minds and institutions, to design next-gen thermal and electrical systems.
Products undergo rigorous testing: thermal shocks ranging from 10°C to 90°C, and damp heat validation for 500 hours, maintaining a defect rate of under 0.05%.
A deep breakdown of the design architecture underlying our high-durability capacitors and moisture absorption technologies.
Every premium round capacitor and copper filter drier utilizes raw components designed for extended lifespans. We import our high-reliability Japanese ITO film and stability-inducing liquid crystal spacers to ensure minimal thermal shrinkage and excellent performance under constant voltage strain. Our copper shells are constructed of high-purity, rust-resistant, and high-pressure-tolerant copper piping, welded using argon arc welding to ensure complete airtightness.
For combined filter drier/accumulator components, we deploy a highly porous 3A molecular sieve core engineered with activated carbon layers. This achieves a water absorption rating of ≥20%, successfully extracting trace moisture and acids from the refrigerant cycle, preventing compressor corrosion and optimizing energy cycles.
| Parameters | Standard Specification Range | Testing Standards |
|---|---|---|
| Lifespan Rating | Up to 10,000 operational hours | UL 810 / Life Test |
| Operating Temperature | -40°C to +85°C | IEC 60252-1 |
| Capacitance Tolerance | ±5% (standard), ±3% (on request) | Dual-frequency bridge |
| Leakage Testing | Helium leak detection <1x10⁻⁶ mbar·l/s | High-vacuum mass spectrometer |
Visual tour of Ningbo Taojun's advanced manufacturing capabilities, standard ISO-certified workshops, and validation laboratories.
Over 35 years of engineering breakthroughs, establishing global standards in refrigeration component manufacturing.
Founded as Xiangshan Refrigeration Accessories Factory, partnered with Zhejiang University to support domestic technological development.
Constructed a new, modernized factory building in Ningbo, adding high-capacity stamping and copper pipe extrusion machinery.
Implemented the MES intelligent workshop management system, transitioning to digitized supply chain tracking and automated assembly lines.
Established Ningbo Taojun Refrigeration Equipment Co., Ltd. Launch of custom stop valves, condenser units, and capacitors for global HVAC OEMs.
Acquired the official National High-Tech Enterprise certification, recognizing our achievements in materials science and environmental design.
Expanded production capacity to service international industrial clients across North America, Europe, South America, and Asia.
Our round capacitors, filter driers, and brass control valves perform in critical industrial environments.
Heavy-duty capacitors provide high starting torque for heavy compressors in superstores and distribution warehouses. Our molecular sieve filters isolate acid and moisture, helping prevent unplanned compressor maintenance.
Supplying split service valves and insulated copper piping designed to withstand the vibration, mechanical friction, and thermal shock common in passenger and transport vehicles.
Universal filter cartridges absorb impurities in high-humidity food service and medical processing environments, keeping refrigerants pure and clean.
Ningbo Taojun ensures high reliability in production. We hold official GB/T19001-2016 / ISO9001:2015 quality management systems certification (Registration No.: 41325Q00065R0S). This verification covers our design and manufacturing operations for filter driers, condensers, and access valves.
Our quality system is verified by China's CNCA (www.cnca.gov.cn). We also maintain EU RoHS, REACH, and UL listings to support seamless integration into European and North American projects.
ISO9001 System Certificate
Detailed Scope Verification
Our industrial parts conform to the strict mechanical, environmental, and electric codes demanded by international auditors.
Critical engineering answers helping global procurement specialists source high-quality components.
Premium round capacitors utilize high-grade metallized polypropylene film coupled with vegetable-based dielectric oils. This enables a robust self-healing feature: if dielectric breakdown occurs under voltage spikes, the metallized layer vaporizes and isolates the fault, allowing the capacitor to continue safe operation. They typically carry UL 810 safety ratings and integrated pressure-sensitive disconnectors to safely isolate the capacitor at the end of its life.
We deploy a comprehensive quality system across our production lines. Our MES system monitors production variables in real-time. Components undergo automatic helium leak testing, high/low temperature testing ranging from 75°C to -35°C, and dedicated 24-hour electrical stress burn-ins to eliminate early failures. Our standard defect rate remains below 0.05%.
Copper components offer high thermal conductivity and corrosion resistance. They are easy to braze in the field, making them standard for residential HVAC lines. Aluminum components, such as receiver tanks, provide lightweight alternatives that reduce total unit mass and lower shipping costs for automotive AC systems. We provide OEM solutions in both high-purity copper and specialized structural aluminum.
Yes. Supported by our roots with the Xiangshan Refrigeration Accessories Factory of Zhejiang University, our engineering division offers design services. We provide custom sizing, modified connection terminals, varied mounting brackets, and customized microfarad (µF) or voltage (VAC) parameters to align with your equipment specifications.
Discover our wider production capabilities including motor capacitors, charging valves, molecular sieves, and brazing tools.
Taojun