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Zhejiang Jingliang Copper-Tube Products Co., Ltd

Wholesale Capillary Copper Tubes

Capillary Copper Tubes

-- Steady & Reliable Manufacturer --

Precision Engineering of Capillary Tubing

Capillary copper tubes are highly specialized, small-diameter tubes that function as critical flow control devices in refrigeration and precision instrumentation. Unlike standard transport piping, the capillary tube serves as a fixed-length metering device, creating a pressure drop that allows the refrigerant to expand and cool. The performance of a capillary tube is entirely dependent on the precision of its internal diameter (ID). Even a variance of 0.01mm can significantly alter the flow rate and efficiency of the entire cooling system. As a leading manufacturer, we employ proprietary drawing processes and high-precision diamond dies to maintain extremely tight tolerances. Each batch of capillary tubing undergoes rigorous flow testing to ensure consistency across the entire production run. These tubes are not just "small pipes"; they are calibrated instruments that dictate the operational balance of refrigerators, freezers, and precision thermal sensors.

In addition to refrigeration, our capillary copper tubes are widely used in the medical and aerospace sectors for fluid delivery and pressure sensing. The material used is typically C12200 phosphorus-deoxidized copper, which provides the necessary ductility for bending and the chemical resistance needed for various gases and liquids. The internal surface must be exceptionally clean and smooth to prevent clogging, which is a common failure point in small-orifice systems. We utilize a specialized ultrasonic cleaning process post-drawing to remove any traces of lubricants or metal shavings. Whether supplied in straight lengths for laboratory use or in large coils for appliance manufacturers, our capillary tubing is characterized by its high concentricity and burr-free ends. For engineers looking for reliable flow control without the complexity of electronic expansion valves, our copper capillary solutions provide a cost-effective, durable, and highly predictable performance profile.

Technical Specifications and Tolerances

PropertySpecification Details
Outer Diameter (OD)1.2mm to 5.0mm
Inner Diameter (ID)0.5mm to 3.0mm
ID Tolerance±0.01mm to ±0.03mm (Ultra-precision)
Wall Thickness Tolerance±0.02mm
CleanlinessResidue < 0.020g/m²
Hardness (HV)70 - 120 HV (Depending on temper)
Standard ComplianceASTM B360, EN 12450
Burst PressureCalculated based on OD/Wall (High safety margins)

Applications in Precision Systems

The most ubiquitous application of capillary copper tubes is in domestic refrigeration. In household refrigerators and chest freezers, the capillary tube acts as the expansion device between the condenser and the evaporator. Its simplicity—having no moving parts—makes it incredibly reliable for appliances meant to last decades. Beyond household appliances, these tubes are critical in the HVAC industry for pressure sensing lines in commercial chillers and as connectors for thermostats and pressure switches. In the medical field, they are used for gas sampling and as components in various diagnostic machines where precise fluid volumes are required. In the industrial sector, capillary tubes are used in steam tracing and as part of temperature control systems for chemical processing. Their ability to handle high pressures despite their small size also makes them suitable for certain hydraulic applications and specialized aerospace cooling loops where every gram of weight matters.

Advantages of Precision Capillary Tubing

The primary advantage of our capillary tubing is its extreme dimensional accuracy. By maintaining an ID tolerance as tight as ±0.01mm, we allow manufacturers to skip the expensive process of individual flow-matching, as our "out-of-the-box" consistency is high enough for direct installation. The use of high-purity copper ensures excellent thermal and electrical conductivity, while our bright annealing process results in a scale-free internal and external surface. This cleanliness is vital; even microscopic debris can cause a "choke" in a capillary system. Our tubes are also highly resistant to vibration fatigue, which is essential for tubes connected to compressors. Furthermore, the soft-annealed temper we provide allows for easy coiling and bending into the tight spaces typical of modern appliance chassis without the risk of kinking or stress corrosion cracking. By choosing our capillary tubes, you are investing in a component that reduces system failure rates and improves the overall COP (Coefficient of Performance) of your cooling equipment.

Packaging, Payment, and Global Logistics

Capillary tubes require specialized packaging to protect their precise dimensions. We offer these in three formats: large coils (for automated cutting), smaller pre-cut and straightened lengths, and custom-bent assemblies. For large orders, coils are wrapped in neutral plastic and packed in reinforced cardboard boxes or wooden crates. Payment is typically handled via T/T or L/C. For samples and small-batch specialized capillary orders (e.g., for lab use), we accept PayPal and Western Union to expedite the process. Our factory is located near major international shipping hubs, allowing us to offer competitive sea freight rates and fast air-freight options for urgent repair or prototype needs. We provide full traceability for every batch, including chemical analysis and flow test reports, ensuring that your quality assurance team has all the necessary documentation upon arrival.

  • Q: How do you verify the flow rate of the capillary tubes?
  • A: We use a standardized dry air flow test where we measure the volume of air passing through a specific length of tube at a set pressure. This is the most accurate way to ensure that the internal diameter is consistent and unobstructed.
  • Q: Can you provide capillary tubes with flared ends or pre-installed nuts?
  • A: Yes, we have a secondary processing department that can flare the ends, add filter driers, or install brass fittings according to your blueprints, saving you assembly time.
  • Q: What is the minimum ID you can manufacture?
  • A: Our standard minimum ID is 0.5mm, but we can evaluate custom requests for even smaller diameters for specialized scientific applications.
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 Tubes and Capillary Copper Tubes 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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