As building automation and smart grids dictate new standards of power optimization, the synergy between electromechanical signal relays, high-amperage AC contactors, and high-performance refrigerant filtration loop systems becomes paramount.
Ningbo Taojun Refrigeration Equipment Co., Ltd. is located in Xiangshan, Ningbo, a beautiful tourist city. Founded in 1988, its predecessor was the Xiangshan Refrigeration Accessories Factory of Zhejiang University. Over 30 years of hard work and rapid development, it has evolved into a comprehensive enterprise integrating the design, development, manufacturing, and distribution of premium refrigeration accessories and HVAC electrical components.
In 2021, Taojun was recognized as a National High-Tech Enterprise. We are dedicated to technological and process innovation, equipment upgrades, and modern management concepts. Our leading products include copper filter driers, check valves, air conditioning valves, condensers, brass and copper accessories, and specialized electrical control switches. The "Lingshan" brand filter has become a household name in China's domestic HVAC/R market.
Establishment and scaling of our initial factory layout in Ningbo.
Implementation of MES intelligent workshop management systems.
Global market integration and advanced smart automation assembly line upgrades.
Ongoing design validation utilizing university research labs.
Deploying highly automated manufacturing technology to design components that exceed global efficiency thresholds.
Designed to actively absorb system moisture and industrial acids while filtering microscopic debris. Featuring premium 3A molecular sieves with a water absorption rate ≥ 20% and an integrated activated carbon core. Hermetically sealed using advanced argon arc welding processes to guarantee zero refrigerant bypass.
Precision brass stop service valves in L-bend designs (from 1/4 to 5/8 inch). Features high mechanical stability, anti-leak properties, and resilience against continuous high pressures (R410A, R32 compatible), ensuring optimal fluid restriction dynamics.
Engineered to handle high current switching cycles without contact oxidation. Designed to trigger reliably with control signals sent from signal relays, these devices isolate weak currents from aggressive terminal lines, preventing system surges.
China's manufacturing sector offers an unparalleled ecosystem for precision mechanical and electronic components. Ningbo Taojun Refrigeration leverages this dense supply chain matrix to source high-grade raw copper and brass alloys directly, ensuring rapid lead times and cost efficiency. By employing imported German manufacturing machines and Japanese ITO films, we provide premium components at scale. Our domestic supply chain network guarantees that raw materials are tested for purity before they hit the extrusion and stamping lines.
No two cooling circuits are identical. We provide custom length copper tubes, specific sieve volume driers (10g, 15g, 20g, and larger commercial sizes), and bespoke bracket configurations for air conditioning access valves. Working alongside engineering teams, we translate custom parameters into robust, market-ready parts using detailed CAD/CAM simulations.
Verifiable certifications and compliance frameworks that safeguard international imports.
Quality Management Systems
Filter Driers & HVAC/R Valves Manufacture
Approved US & Canadian Electrical Standards
Hazard-free Material Utilization Compliance
Our quality management system is officially registered under certificate number 41325Q00065R0S, issued by Zhongci International and verifiable on China’s CNCA system (www.cnca.gov.cn). We manage a strict vertical operation, ensuring that all safety valves, condensers, and micro-electromechanical relay integrations meet the RoHS environmental guidelines, CE certifications, and REACH frameworks. Partnering with world-class home appliance brands such as Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui, our products undergo verification in diverse operating environments, from high-humidity coastal zones to dry industrial facilities.
The modern refrigeration sector is undergoing a rapid transition toward low-GWP (Global Warming Potential) natural refrigerants such as R290 (propane) and CO2. These substances demand much higher working pressure parameters and tighter molecular moisture control. Consequently, next-generation copper filter driers must utilize specific binders that resist breakdown when exposed to synthetic polyolester (POE) and polyalkylene glycol (PAG) lubricants.
Concurrently, the micro-switch market is shifting toward solid-state and energy-efficient magnetic latching signal relays. These switches interface seamlessly with smart IoT thermostats, minimizing power loss during switching cycles.
Taojun