Web Menu

Product Search

Language

Share

Zhejiang Jingliang Copper-Tube Products Co., Ltd

Wholesale Copper Capillary for Thermostats

Copper Capillary for Thermostats

-- Steady & Reliable Manufacturer --

The Precision Pulse of Temperature Control

Copper capillary tubes for thermostats are specialized, ultra-fine tubes that serve as the sensing and transmission elements in mechanical temperature control systems. These tubes act as the "nervous system" of a thermostat, connecting the sensing bulb to the bellows or switch mechanism. At Zhejiang Jingliang, our capillary tubing is manufactured to tolerances that are much tighter than standard refrigeration tubing, often requiring precision down to the micron level. We utilize high-purity C12200 copper to ensure that the fluid or gas inside the tube can expand and contract with absolute consistency. The internal diameter (ID) of a thermostat capillary is critical; any variation in the bore can lead to inaccurate temperature readings or slow response times. Our drawing process utilizes specialized diamond dies and high-frequency monitoring to ensure that the internal bore is mirror-smooth and perfectly uniform across lengths of hundreds of meters.

Thermostat capillaries must be incredibly durable yet highly flexible. They are often snaked through narrow passages in appliances and must withstand millions of thermal cycles without work-hardening or developing micro-cracks. We achieve this through a controlled "soft-annealing" process that maximizes the material's fatigue life. Furthermore, internal cleanliness is paramount—even a single microscopic particle could block the capillary and render the thermostat useless. Our thermostat capillaries undergo ultrasonic cleaning and are 100% flow-tested to ensure they meet the specific flow-rate requirements of the sensor manufacturer. Whether for a domestic refrigerator, an industrial oven, or a sensitive laboratory incubator, our copper capillary tubing provides the high-fidelity signal transmission necessary for accurate and reliable temperature regulation.

Capillary Technical Specs & Precision Data

PropertyThermostat Capillary Specification
Outer Diameter (OD)1.2mm to 3.0mm (±0.02mm)
Inner Diameter (ID)0.5mm to 1.5mm (±0.015mm)
Material GradeC12200 (Cu-DHP), C10100 (Oxygen-Free)
TemperSoft Annealed (O60) - High Ductility
ID Surface FinishRa ≤ 0.2 μm (Mirror Smooth)
CleanlinessVacuum Degreased / Solvent Cleaned
Flow Accuracy±2% of specified flow rate
Max LengthContinuous coils up to 2,000 meters
Fatigue ResistanceTested for >1 million flex cycles

Applications in Sensing and Control

These precision tubes are primarily used in the manufacturing of Capillary Thermostats for domestic appliances like refrigerators, freezers, ovens, and water heaters. They are also essential in HVAC Temperature Sensors for air conditioners and commercial boilers. In the automotive sector, they are used in cooling system sensors and oil temperature gauges. Beyond household appliances, our capillaries are used in Industrial Process Controls where mechanical temperature sensing is preferred for its reliability and lack of need for electrical power. They are also found in Medical Incubators and laboratory equipment where precise, analog temperature control is required. In the aviation industry, they serve as part of fire detection systems and hydraulic sensors. Because of their reliability, they are often used as "Fail-Safe" devices that mechanically shut off gas or power if a specific temperature limit is exceeded.

Advantages of Jingliang Precision Capillaries

The primary advantage is "Signal Accuracy." Our mirror-smooth internal bore and consistent ID ensure that the expansion of the sensing medium is perfectly linear, allowing for sub-degree temperature control. "Exceptional Flexibility" is another key benefit; our copper can be bent into tight radii during installation without kinking or narrowing the bore. We offer "Superior Fatigue Life," ensuring that the thermostat remains accurate even after decades of heating and cooling cycles. Our "Ultra-Clean Production" eliminates the risk of blockages, which is the leading cause of thermostat failure. Furthermore, we provide "Custom Calibration" service, where we can adjust the internal diameter to match your specific flow requirements, reducing the need for calibration at the final assembly stage. Finally, the "Chemical Compatibility" of our high-purity copper ensures it will not react with common temperature-sensing fluids like alcohol or hydrocarbons.

Precision Packaging and Global Delivery

Because capillary tubes are delicate and small in diameter, they require specialized packaging to prevent crushing or kinking. We supply them in "Pancake Coils" or on "Plastic Spools" that protect the tubing during handling. Payment is usually T/T or L/C at sight. We use vacuum-sealed plastic bags to prevent any surface oxidation, ensuring the material arrives "Bright and Clean." Our shipping department is experienced in air-freight and sea-freight, ensuring that these high-value components reach global thermostat manufacturers in Europe, North America, and Asia quickly and safely. We provide full dimensional inspection reports and flow-test certificates with every batch, giving you the confidence that every millimeter of the tube meets your technical drawings.

  • Q: How do you ensure the internal diameter is consistent?
  • A: We use high-precision floating-plug drawing and continuous eddy-current monitoring to ensure the ID remains within ±0.015mm throughout the entire coil.
  • Q: What is the benefit of using copper over stainless steel for capillaries?
  • A: Copper has much higher thermal conductivity, leading to faster response times, and it is significantly easier to braze and bend, making it more cost-effective for mass production.
ABOUT US
30+YEARS OF
EXPERIENCE
About Us

A Reliable Partner of the Copper Tube Industry

Zhejiang Jingliang Copper-Tube Products Co., Ltd is China Copper Capillary for Thermostats and Copper Capillary for Thermostats Factory, which established in 1994, has been deeply involved in the copper tube industry for over three decades. The company primarily produce various specifications of products such as copper tubes, brass tubes, copper square tubes, fin copper tubes, copper capillary tubes, condenser copper tubes, copper evaporator tubes, and conductive rods, which are of quality and have earned the trust and acclaim of customers both domestically and internationally.

Wide Applications:

These products are widely used in various fields including air conditioning, refrigeration, heat exchange, sanitary ware, automotive, machinery, electric furnaces, and chemical industries.

Convenient Transportation:

Strategically located in Tangpu Town, renowned as the “home of copper tubes” in East China. Our company enjoys a prime location, adjacent to the Shangsan Expressway and National Highway 104, and is conveniently situated just over 70 kilometers from Hangzhou and Ningbo, ensuring easy accessibility and a business position.

Strong Financial Resources:

With its strong financial resources and advanced copper tube processing technology, our company holds an advantageous position in market share, brand value, technological content, and product quality, becoming a preferred supplier for many listed groups.

Large Scale Production:

The company occupies an area of over 20,000 square meters, with a construction area of 12,800 square meters. In 2022, our annual production exceeded 7,500 tons, with a value output of up to 450 million yuan, demonstrating our strong production capacity and market competitiveness.

Comprehensive Industry Chain:

Jingliang has now developed into a complete industrial chain integrating smelting, extrusion, drawing, precision rolling, and annealing. It has been awarded multiple honors, including "Top Ten Copper Tube Enterprises" and "Leading Taxpayer in the Copper Tube Industry".

Smart Manufacturing:

Jingliang Copper-Tube Products will better integrate the concept of factory construction into its corporate development strategy, insist on refining technology and polishing products more finely, and the future of "intelligent manufacturing".

Genuine Cooperation:

Zhejiang Jingliang Copper-Tube Products Co.,Ltd warmly welcomes friends from all walks of life to visit and offer guidance. We look forward to joining hands with you to create a brilliant future together.

Message Feedback

  • Capillary Copper Tubes
  • Copper Nickel Alloy Tubes
  • Copper Fittings & Connectors
  • AC & Refrigeration Copper Tubing
    • X Facebook
    Products News