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Zhejiang Jingliang Copper-Tube Products Co., Ltd

Wholesale Capillary Copper Tube

Capillary Copper Tube

-- Steady & Reliable Manufacturer --

Precision Control for Refrigeration and Instrumentation

Capillary copper tubing is the "precision instrument" of the piping world. Unlike standard plumbing pipes, capillary tubes are defined by their incredibly small internal diameters (ID) and precise wall thicknesses. At Zhejiang Jingliang, we view capillary production as a high-stakes engineering task. These tubes act as a fixed metering device in refrigeration and air conditioning systems, creating a pressure drop that facilitates the cooling process. Because the flow rate is determined entirely by the tube's length and internal friction, the "Internal Surface Quality" must be near-perfect. Any microscopic burr, oil residue, or deviation in diameter could lead to system inefficiency or complete blockage. Our capillary tubes undergo a series of specialized cold-drawing stages to achieve tolerances as tight as ±0.01mm. This level of precision is why our tubes are trusted by leading global manufacturers of domestic refrigerators, water coolers, and precision laboratory equipment.

The manufacturing process begins with high-purity C12200 phosphorus-deoxidized copper. To ensure the tube remains free of contaminants, we utilize a proprietary "Ultrasonic Cleaning" system that flushes the interior with solvent during the final drawing stage. Afterward, the tubes are nitrogen-purged and capped to maintain an oxygen-free interior during shipping. While most commonly used in refrigeration, capillary tubing also serves as the backbone for pressure gauges, temperature sensors, and hydraulic control systems in the aerospace industry. The ductility of our copper allows these tiny tubes to be coiled into extremely tight diameters without kinking, which is essential for compact appliance designs. At Jingliang, we don't just sell metal; we sell a calibrated component that ensures the thermal stability of your entire system.

Micro-Scale Dimensional & Material Data

PropertyCapillary Specification
Outer Diameter (OD) Range1.2mm - 5.0mm
Inner Diameter (ID) Range0.5mm - 3.0mm
ID Tolerance± 0.01mm to ± 0.025mm
Copper GradeC12200 / C10200 (Oxygen-Free)
Standard TemperY2 (Hard) or M (Soft)
Cleanliness StandardASTM B280 / EN 12735-1
Internal Residue≤ 0.020 g/m²
Tensile Strength245 - 345 MPa
Burst Pressure (Est.)Up to 15,000 PSI (Size dependent)
Surface Roughness (Ra)≤ 0.5 μm

Metering and Sensing in High-Precision Environments

The primary application for capillary copper tubing is as an "Expansion Device" in domestic refrigerators, freezers, and small-capacity air conditioning units. It serves as the bridge between the high-pressure condenser and the low-pressure evaporator. In the field of "Instrumentation," these tubes are used to connect pressure transmitters to process lines, dampening pressure surges to protect sensitive sensors. They are essential in "Thermometry," where they act as the remote sensing bulb lead for mechanical thermostats. In the automotive sector, capillary tubes are used for oil pressure lines and fuel injection components. Medical laboratories utilize them for fluid transfer in "Chromatography" and other analytical equipment where a constant, low-flow rate is required. They are also found in "Electronic Cooling" systems, where they circulate coolant in micro-channels for high-performance servers.

Precision, Reliability, and System Simplification

The greatest advantage of our capillary tubing is "Unmatched Dimensional Consistency." Because the cooling capacity of a refrigerator depends on the friction within the tube, our strict ID tolerances allow manufacturers to standardize their system charges without constant recalibration. "Internal Cleanliness" is another critical benefit; by removing all traces of drawing oils, we prevent the "waxing" effect that can clog small-bore systems. The "High Pressure Resistance" of these small-diameter tubes is extraordinary, often exceeding 10,000 PSI, which provides a massive safety margin in modern CO2 or high-pressure refrigerant systems. "Corrosion Resistance" ensures that the metering characteristics do not change over a 20-year lifespan. Furthermore, the "Ease of Forming" allows for complex, compact winding, which "Saves Space" in modern appliance design. Finally, because a capillary tube has no moving parts, it offers a "Maintenance-Free" alternative to electronic expansion valves in budget-friendly cooling units.

Packaging for Fragile Dimensions

Capillary tubes are easily crushed or bent, so we package them in reinforced "pancake coils" or "level-wound coils" on sturdy plastic reels. For straight lengths, they are shipped in rigid PVC or wooden tubes to prevent bending. Every reel is sealed in a vacuum-packed moisture barrier bag. Payment is accepted via T/T, with 30% upfront and 70% before shipment. We provide specialized "Flow Rate Testing" reports upon request to verify the hydraulic performance of the batch. Shipping is handled through Ningbo or Shanghai. For high-volume appliance manufacturers, we offer "Just-in-Time" delivery schedules to reduce your on-site inventory costs.

  • Q: Can you provide specific lengths with pre-flared ends?
  • A: Yes, we offer custom cutting and end-forming services, including flaring and swaging, to meet your assembly line requirements.
  • Q: How do I prevent blockages during brazing?
  • A: Always use a nitrogen purge during brazing and ensure you use a minimal amount of flux to prevent it from being sucked into the narrow ID.
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 Capillary Copper Tube and Capillary Copper Tube 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.

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