أنابيب ومواسير ولفائف ووصلات نحاسية
استعرض
Copper Capillary Tubes for Refrigeration & HVAC Applications
Product Overview
Copper Capillary Tubing supplied by R V Metal Corporation is manufactured from high-purity, oxygen-free Copper DHP to deliver precise flow control in critical refrigeration, HVAC, and instrumentation applications. Each tube is produced with extremely tight dimensional tolerances, smooth internal bore finish, and consistent wall accuracy, ensuring stable pressure management and reliable performance in expansion, metering, and control circuits. These capillary tubes are widely used with refrigerants such as R22, R134a, R404A, R410A, and R32, and are available in a wide range of internal diameters, outer diameters, and coil forms to meet OEM and service-industry requirements. Designed for superior corrosion resistance, ease of fabrication, and long operational life, they provide dependable performance in air-conditioners, commercial cooling equipment, heat pumps, and precision control systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Material Grade | Copper DHP (Deoxidized High Phosphorus) – Cu-DHP / CW024A |
| Copper Purity | ≥ 99.90% Cu |
| Phosphorus Content | 0.013% – 0.050% |
| Outer Diameter (OD) | 0.8 mm – 6.35 mm (custom sizes available) |
| Inner Diameter (ID) | 0.31 mm – 5.00 mm (depending on OD & wall) |
| Wall Thickness | 0.20 mm – 1.00 mm |
| Standard Coil Length | 15 m, 30 m, 50 m, 100 m (continuous coils) |
| Tolerance (OD / ID) | ±0.02 mm to ±0.05 mm (as per application requirements) |
| Surface Finish | Bright, smooth, oxide-free internal bore |
| Hardness / Temper | Soft (Annealed) – O60 |
| Operating Temperature | -40°C to +150°C |
| Compatible Refrigerants | R22, R134a, R404A, R410A, R32, R290, R600a |
| Manufacturing Standards | ASTM B280, ASTM B360, EN 12450 |
| Applications | Flow control, metering devices, expansion systems, precision refrigeration circuits |
Chemical Composition
| Element | Symbol | Specification (Cu-DHP / CW024A) |
|---|---|---|
| Copper | Cu | ≥ 99.90% |
| Phosphorus | P | 0.013% – 0.050% |
| Oxygen | O | ≤ 0.02% |
| Lead | Pb | ≤ 0.005% |
| Iron | Fe | ≤ 0.005% |
| Zinc | Zn | ≤ 0.005% |
| Total Impurities | — | ≤ 0.15% |
| Grade Standard | — | Cu-DHP (CW024A) / ASTM B360 / EN 12450 |
UNS Codes & Grades
| Grade | UNS Number | European Designation | ISO / International Grade | Typical Application Use |
|---|---|---|---|---|
| Copper DHP | C12200 | CW024A | Cu-DHP | Capillary tubes for refrigeration, HVAC, expansion devices |
| Copper DLP | C12000 | CW023A | Cu-DLP | Low-oxygen copper for precision tubes & instrumentation |
| Copper ETP | C11000 | CW004A | Cu-ETP | Electrical & electronic grade copper (used only on request) |
Mechanical, Physical & Fabrication Properties
| Property Category | Parameter | Copper DHP (C12200) | Copper DLP (C12000) | Copper ETP (C11000) |
|---|---|---|---|---|
| Mechanical Properties | Tensile Strength | 205–250 MPa | 210–260 MPa | 210–250 MPa |
| Yield Strength | 60–100 MPa | 65–110 MPa | 60–110 MPa | |
| Elongation | 30–45% | 28–40% | 35–45% | |
| Physical Properties | Thermal Conductivity | 340 W/m·K | 330 W/m·K | 390 W/m·K |
| Electrical Conductivity (% IACS) | 80–85% | 88–92% | 100% | |
| Density | 8.94 g/cm³ | 8.94 g/cm³ | 8.94 g/cm³ | |
| Melting Point | 1083°C | 1083°C | 1083°C | |
| Fabrication Properties | Brazing | Excellent | Excellent | Good |
| Welding | Good | Good | Poor (oxygen sensitive) | |
| Formability | Excellent (ideal for small-diameter capillary tubing) | Very Good | Good | |
| Corrosion Resistance | Excellent (internal refrigeration oils + refrigerants) | Excellent | Good |
Common Names & International Identifiers
| Grade | Common Names | International Identifiers | Typical Usage in Capillary Tubes |
|---|---|---|---|
| Copper DHP (C12200) |
- Deoxidized High Phosphorus Copper - Medical & Refrigeration Grade Copper - DHP Copper |
UNS: C12200 ISO: Cu-DHP EN: CW024A JIS: C1220T BS: Cu-DHP |
Ideal for refrigeration flow control, HVAC, capillary constriction tubing, precision metering tubes. |
| Copper DLP (C12000) |
- Deoxidized Low Phosphorus Copper - DLP Copper - Low-P Copper |
UNS: C12000 ISO: Cu-DLP EN: CW023A JIS: C1201 BS: Cu-DLP |
Used for capillary tubing requiring higher ductility and bending performance. |
| Copper ETP (C11000) |
- Electrolytic Tough Pitch Copper - ETP Copper - High Conductivity Copper |
UNS: C11000 ISO: Cu-ETP EN: CW004A JIS: C1100 ASTM: ETP Grade |
Used in electrical capillary tubes, precision microtubes, and high conductivity applications. |
Standards & International Equivalents
| Standard | Specification Details | Relevant Grades (DHP / DLP / ETP) | Application Notes |
|---|---|---|---|
| ASTM B68 | Seamless Copper Capillary Tube for Air Conditioning & Refrigeration | C12200 (DHP), C12000 (DLP) | Primary international standard for precision capillary tubes used in HVAC & refrigeration throttling systems. |
| ASTM B75 | General Seamless Copper Tubes | C11000 (ETP), C12200 (DHP) | Used where high conductivity or corrosion resistance is required. |
| EN 12449 | Copper and Copper Alloy Seamless Round Tubes for General Purposes | CW024A (DHP), CW023A (DLP), CW004A (ETP) | European standard for precision tubes including thin-wall capillary formats. |
| EN 12735-1 | Copper and Copper Alloys — Seamless Tubes for Air Conditioning & Refrigeration | CW024A (DHP) | Most widely used EU standard for ACR capillary tubes. |
| JIS H3300 | Seamless Copper Tubes | C1220T (DHP), C1100 (ETP) | Japanese industrial standard commonly used for capillary tubing production. |
| ISO 1635 | Wrought Copper and Copper Alloys — Seamless Pipes & Tubes | Cu-DHP, Cu-DLP, Cu-ETP | International equivalent for chemistry + mechanical properties. |
| BS EN 1057 | Seamless Copper Tubes for Water & Gas | CW024A (DHP) | Capillary tubes used in plumbing instrumentation and safety devices. |
| DIN 1786 | Seamless Copper Tubes — Technical Requirements | Cu-DHP / Cu-DLP | German standard relevant for precision small-diameter tubing. |
Applications
| Application Category | Industry | Descriptions & Use Cases |
|---|---|---|
| Refrigerant Flow Control | HVAC & Refrigeration | Used in capillary expansion devices to meter refrigerant flow in refrigerators, deep freezers, AC units, water coolers, showcase chillers, and heat pumps. |
| Precision Metering Tubes | Instrumentation & Controls | Applied in pressure control systems, sensing lines, flow meters, and safety control devices requiring extremely small internal diameters with tight tolerances. |
| Medical Equipment | Healthcare & Diagnostics | Used in medical gas control systems, anesthesia machines, ventilators, and precision flow regulation devices. |
| Automotive Systems | Automotive & Mobility | Capillary tubes are used in fuel metering lines, lubrication systems, sensor lines, and thermal management modules. |
| Gas Flow Regulation | Gas Industry | Utilized for LPG/propane appliances, burner assemblies, pilot lines, and gas pressure regulation devices. |
| Electronics & Electrical | Consumer Electronics | Used in temperature control circuits, thermostats, and safety cutoff switches. |
| Laboratory & Scientific Equipment | Research & Testing | Suitable for chromatographs, vacuum instruments, micro-flow systems, and analytical devices requiring stable flow control. |
| Solar Thermal Systems | Renewable Energy | Employed in micro-channel flow arrangements in solar heating and thermal collection units. |
Standard Copper Tube Dimensional Chart
| Outside Diameter (mm) | Wall Thickness (mm) | Inside Diameter (mm) | Standard Length (m) | Theoretical Weight (kg/m) | Remarks |
|---|---|---|---|---|---|
| 2.00 | 0.30 | 1.40 | 15 – 30 | 0.041 | Ultra-fine metering tubes |
| 2.50 | 0.40 | 1.70 | 15 – 30 | 0.067 | Refrigeration controls |
| 3.00 | 0.45 | 2.10 | 15 – 30 | 0.090 | Capillary expansion devices |
| 3.18 (1/8") | 0.50 | 2.18 | 15 – 30 | 0.105 | Common HVAC capillary size |
| 4.00 | 0.50 | 3.00 | 15 – 30 | 0.140 | Instrumentation tubes |
| 4.76 (3/16") | 0.50 | 3.76 | 15 – 30 | 0.168 | Gas & pressure control lines |
| 6.00 | 0.60 | 4.80 | 15 – 30 | 0.259 | Automotive & precision flow systems |
| 6.35 (1/4") | 0.70 | 4.95 | 15 – 30 | 0.310 | Common refrigeration capillary coil |
| 7.00 | 0.80 | 5.40 | 15 – 30 | 0.375 | Heavy-duty metering tubes |
| 8.00 | 1.00 | 6.00 | 15 – 30 | 0.510 | High-pressure capillary & control lines |
• All weights are theoretical and based on copper density 8.94 g/cm³. • Actual tube weight may vary ±5% depending on temper and drawing method. • ID tolerance is critical in capillary tubing and can be customized as per customer requirements. • Straight lengths, coils, and level-wound forms available on request.
| Refrigerant | System Capacity (Ton) | Recommended Capillary ID (mm) | Recommended OD (mm) | Typical Capillary Length (m) | Remarks |
|---|---|---|---|---|---|
| R-410A | 0.75 – 1.0 | 1.10 – 1.30 | 2.10 – 2.50 | 1.2 – 1.8 | High-pressure refrigerant; shorter tube length |
| R-410A | 1.5 – 2.0 | 1.30 – 1.60 | 2.50 – 3.00 | 1.5 – 2.3 | Common VRF indoor module size |
| R-410A | 2.5 – 3.0 | 1.60 – 1.80 | 3.00 – 3.50 | 1.8 – 2.5 | Used in larger multi-port VRV circuits |
| R-32 | 1.0 – 1.5 | 1.20 – 1.40 | 2.10 – 2.50 | 1.0 – 1.8 | Better efficiency → smaller orifice needed |
| R-32 | 1.5 – 2.0 | 1.40 – 1.60 | 2.50 – 3.00 | 1.3 – 2.0 | High mass-flow refrigerant |
| R-22 | 1.0 – 1.5 | 1.50 – 1.70 | 2.80 – 3.20 | 1.8 – 2.8 | Legacy systems only |
| R-22 | 1.5 – 2.0 | 1.70 – 2.00 | 3.00 – 3.50 | 2.0 – 3.0 | Slower refrigerant velocity |
| Cooling Capacity (Ton) | Typical ID (mm) | OD (mm) | Recommended Length (m) | Expected Flow Rate | Applications |
|---|---|---|---|---|---|
| 0.5 Ton | 0.80 – 1.00 | 2.00 – 2.50 | 1.8 – 2.5 | Low refrigerant flow | Table-top AC, small HVAC modules |
| 0.75 Ton | 1.00 – 1.20 | 2.10 – 2.50 | 1.5 – 2.3 | Moderate flow | Small wall AC, VRF indoor units |
| 1.0 Ton | 1.20 – 1.40 | 2.50 – 3.00 | 1.3 – 2.0 | Stable flow rate | Standard AC, Split AC |
| 1.5 Ton | 1.40 – 1.60 | 3.00 – 3.50 | 1.2 – 1.8 | High mass-flow | Mid-size rooms, VRF branch units |
| 2.0 Ton | 1.60 – 1.80 | 3.50 – 4.00 | 1.0 – 1.6 | Heavy flow | Large AC, industrial cooling |
| 3.0 Ton | 1.80 – 2.20 | 4.00 – 4.50 | 0.8 – 1.5 | Very high refrigerant flow | VRF outdoor units, multi-split |
• Capillary tube sizing must be validated against refrigerant type, evaporator load, and compressor characteristics. • VRF/VRV OEMs use proprietary algorithms, so these ranges provide correct industry-standard guidance but final tuning is always system-specific. • Length reduces as ID increases; ID reduces as pressure ratio increases. • Custom capillary tubes can be supplied in coils or straight lengths with micron-level ID tolerance.
