Modern commercial and industrial refrigeration and HVAC systems operate under increasingly hostile environments. Global temperature swings, dynamic load profiles, and the rapid transition to eco-friendly, low-GWP refrigerants place unprecedented stress on hermetic compressors. In this climate, a compressor is only as safe as its safety system. Active bimetallic thermal protectors and highly effective filter driers are the system's first line of defense against electrical motor burnouts and chemical/moisture contamination.
As a key supplier, Ningbo Taojun Refrigeration Equipment Co., Ltd. builds critical electrical and fluid-line safeguards. By combining strict physical protection mechanisms, such as overload relays and bimetal thermal protectors, with active chemical moisture-adsorption products (like our high-purity copper filter driers), we provide global clients with complete protection. This layout significantly lowers operational downtime and helps HVAC companies meet demanding international energy efficiency goals.
“Operational integrity in HVAC installations depends on mechanical cleanliness and thermal stability. Our system components work together to protect mechanical parts from acidic wear and motor windings from thermal overload.”
Founded in 1988, Ningbo Taojun Refrigeration Equipment Co., Ltd. (formerly the Xiangshan Refrigeration Accessories Factory of Zhejiang University) has spent nearly four decades developing professional-grade refrigeration components. Located in Xiangshan, Ningbo, our facility occupies a key position in China's industrial manufacturing network.
We design, engineer, and manufacture filter driers, check valves, air conditioning valves, copper-to-brass fittings, and custom condensers. Our factory features advanced automated machinery imported from Germany, and we work closely with key technical universities. Today, we are recognized as a National High-Tech Enterprise, holding verified GB/T19001-2016 / ISO9001:2015 certifications alongside EU RoHS, REACH, and US UL marks. Our products protect systems for leading global brands, including Haier, Midea, Gree, Whirlpool, and Electrolux.
Our team combines university research with industrial precision. We run 24-hour aging cycles and 500-hour environmental stresses to verify every safety switch and copper filter drier before shipment.
A detailed look at the design features and materials that ensure our refrigeration and thermal protection components perform reliably over their service life.
We use high-purity, oxygen-free copper (C12200) to manufacture our shells. This provides excellent resistance to oxidation, rust, and high system pressures. Joints are welded using automated argon arc and silver-brazing setups to prevent leaks under cyclical pressure loads.
Our copper filter driers feature a dual-action core. We combine high-capacity 3A molecular sieves with activated alumina to remove both moisture and harmful acids from the circulating refrigerant.
We supply high-reliability overload and bimetallic thermal protectors designed to monitor compressor shell and winding temperatures. These controls disconnect the circuit before motor insulation fails.
How our component portfolio meets performance and regulatory demands across different operating environments.
Residential refrigeration demands silent, energy-efficient, and maintenance-free operation for up to 15 years. Our copper filter driers (ranging from 10g to 25g) use fine mesh filters to capture particulate matter, preventing capillary tube blockages and protecting bimetallic safety systems from frequent thermal cycles.
Ice machines experience continuous, rapid thermal shifts during freeze and harvest stages. Our heavy-duty liquid line driers and brass safety valves resist copper scaling and structural fatigue under high vibration, ensuring consistent ice production and system reliability.
Mobile air conditioning systems must withstand constant mechanical shocks, road vibrations, and wide ambient temperature ranges. Our customized copper accumulators and aluminum receiver tanks feature reinforced brackets and secure fittings to prevent refrigerant leaks.
Operating out of Ningbo's industrial zone, Taojun Refrigeration maintains full vertical control over our production lines. We handle raw material sourcing, precision copper extrusion, automated internal core assembly, and final helium leak testing under a single quality management system. This integration allows us to keep production costs stable and shield international partners from supply chain disruptions.
Our facility runs an advanced MES intelligent workshop system, enabling real-time monitoring of every production run. Key raw materials, including Japanese ITO films and European high-temperature protective adhesives, are sourced through long-term partner contracts. This allows us to offer competitive pricing, a low 500-unit MOQ for custom items, and rapid 72-hour shipping capabilities from the Port of Ningbo.
How we align our engineering with changing environmental rules and future HVAC trends.
Our latest copper accessories and filter driers are designed to handle the higher pressures and specific oil-miscibility needs of natural refrigerants, supporting eco-friendly cooling designs.
We are developing filter driers with built-in electronic sensors that monitor refrigerant moisture levels and system temperatures, helping operators schedule preventive maintenance.
We are updating our alloys to lead-free brass formulations, helping our products comply with upcoming RoHS and REACH revisions and reducing environmental impact.
Ningbo Taojun operates under a comprehensive quality management framework certified to GB/T19001-2016 / ISO9001:2015 (Registration No.: 41325Q00065R0S). This system governs everything from initial design validation to final verification testing.
We follow a strict quality control workflow. This includes a 500-hour environmental stress test at temperatures ranging from -35°C to +75°C, thermal shock testing between 10°C and 90°C, and 24-hour electrical run-in cycles for our control components. Our focus on quality ensures our parts meet the safety and reliability standards required by international markets.
ISO 9001 Certificate
Scope Certification
Expert answers to common questions about system safety, contamination controls, and operational reliability.
Bimetallic thermal protectors mount directly to the compressor housing or within the motor windings. They monitor both current draw and skin temperature. If an electrical overload or cooling failure occurs, the internal bimetal disc heats up and snaps open, breaking the electrical circuit. This stops the motor before the winding insulation degrades, preventing permanent motor failure.
A 3A molecular sieve features a pore structure optimized for moisture capture. The 3-angstrom pore size easily traps small water molecules (approx. 2.8Å) while excluding larger refrigerant molecules, such as HFCs and HFOs. This selective adsorption prevents chemical degradation and avoids heat generation within the filter drier, keeping the system clean and stable.
Every batch of our filter driers, service valves, and copper assemblies undergoes a strict testing regimen. We perform automated high-pressure burst tests up to 4.5 MPa, followed by high-sensitivity helium mass spectrometer leak detection. This guarantees that each component is sealed and ready for long-term service in high-pressure HVAC systems.
Taojun