Hongze Valve
One-Stop Supplier for Rubber Joints, Bellows, and Waterproof Casings
Flexible Metal Hose
Flexible Metal Hose, also known as stainless steel flexible hose, metal braided hose, or corrugated metal hose, is an industrial-grade connector designed to handle high pressure, vibration, thermal expansion, and misalignment in piping systems. Constructed with a corrugated stainless steel inner tube and an outer braided layer, our hoses provide superior flexibility and strength. Available with flanged, threaded, or quick-connect ends, these hoses are ideal for use in HVAC systems, industrial pipelines, water supply, gas transmission, and chemical processing.
Flexible metal hoses are corrosion-resistant, maintenance-free, and suitable for transferring water, steam, oil, gas, and other fluids under demanding conditions.
Key Features
Technical Specifications
| Nominal Diameter (DN) | Inner Diameter (mm) | Bellows OD (mm) | OD with 1 Layer Braid (mm) | Min. Bending Radius (Static) (mm) | Min. Bending Radius (Dynamic) (mm) | Working Pressure – 1 Layer (MPa) | Working Pressure – 2 Layers (MPa) | Working Pressure – 3 Layers (MPa) |
|---|---|---|---|---|---|---|---|---|
| 8 | 8.8 | 13.2 | 14.4 | 50 | 110 | 15 | 20 | – |
| 10 | 11.7 | 16.5 | 17.7 | 65 | 145 | 15 | 20 | – |
| 15 | 13.5 | 19.5 | 21.1 | 80 | 180 | 15 | 20 | – |
| 20 | 20 | 27 | 28.6 | 120 | 270 | 10 | 15 | – |
| 25 | 27 | 34.5 | 36.1 | 160 | 360 | 6.3 | 10 | – |
| 32 | 32 | 40 | 41.6 | 175 | 400 | 4 | 6.3 | – |
| 40 | 39.6 | 52 | 53.6 | 225 | 510 | 4 | 6.3 | – |
| 50 | 49.7 | 62 | 63.6 | 280 | 640 | 3 | 5 | – |
| 65 | 61.2 | 80.2 | 81.8 | 410 | 915 | 3 | 5 | – |
| 80 | 79 | 96.3 | 97.9 | 486 | 1030 | 3 | 5 | – |
| 100 | 101.2 | 119.6 | 121.2 | 610 | 1340 | 2.5 | 4 | – |
| 125 | 124.1 | 145.3 | 146.9 | 700 | 1540 | 2.5 | 4 | – |
| 150 | 149.4 | 180.8 | 182.4 | 810 | 1780 | 2.5 | 4 | – |
| 200 | 196 | 240 | 243.2 | 1000 | 2000 | 2.5 | 4 | – |
| 250 | 248 | 290 | 294 | 1250 | 2500 | 2.5 | 4 | – |
| 300 | 300 | 345 | 354 | 1500 | 3000 | 2.4 | 3.7 | – |
| 350 | 350 | 397 | 404.8 | 1750 | 3500 | 1.6 | 3.7 | – |
| 400 | 400 | 452.4 | 464.8 | 2000 | 4000 | 1.6 | 2.5 | 3.7 |
| 450 | 450 | 503 | – | 2250 | 4500 | – | – | 3.7 |
| 500 | 500 | 553 | – | 2500 | 5000 | – | – | 3.7 |
Technical Parameters – Stainless Steel Flexible Hose
| Parameter | Unit | Value |
|---|---|---|
| Working Pressure | MPa | 1.0 / 1.6 / 2.5 |
| Burst Pressure | MPa | ≥ 7.5 |
| Vacuum Resistance | KPa | 86.7 |
| Operating Temperature | °C | -196 ~ 600 (Special: up to 800) |
| Material | – | Stainless Steel 304, 316L |
| Media | – | Water, Oil, Gas, Steam, Chemicals |
| Flange Standard | – | DIN, ANSI, JIS, GB |
| Connection Type | – | Flanged, Welded, Threaded |
| Axial Movement | mm | ±6 ~ ±25 (depending on DN) |
| Lateral Movement | mm | ±5 ~ ±15 (depending on DN) |
| Angular Movement | ° | ±5 ~ ±15 (depending on DN) |
| Corrosion Resistance | – | Excellent |
| Flexibility | – | High |
| Applicable Industries | – | Petrochemical, HVAC, Marine, Power Generation |
Hose Materials
| Material | Properties | Application Purpose |
|---|---|---|
| Stainless Steel 304 | Excellent corrosion resistance, good flexibility, suitable for general conditions | General water, oil, gas pipelines, moderate-temperature applications |
| Stainless Steel 316L | Superior corrosion resistance, high durability, suitable for harsh environments | Chemical, pharmaceutical, food industries, seawater applications |
| Stainless Steel 321 | High-temperature resistance, superior mechanical strength | High-temperature steam, exhaust gas, hot oil, and industrial furnace connections |
Installation Guide
Ensure that the metal flexible hose is free from any visible damage or defects before installation.
Avoid excessive bending, twisting, or stretching; maintain minimum recommended bending radius.
Connect hose securely using appropriate flanges, threads, or welding methods according to system design.
Support the hose adequately to avoid vibration and stress at the connection points.
After installation, perform a leak test under low pressure and gradually increase to operating pressure.
Maintenance Guide
Conduct regular visual inspections for wear, corrosion, and potential leaks at connections.
Check and tighten connections periodically to ensure sealing integrity.
Avoid exposure to environments exceeding recommended temperature and pressure ratings.
Replace immediately if any damage, leakage, or significant deformation is found during routine inspections.
Regularly clean hoses used in sensitive industries (e.g., food, pharmaceuticals) to avoid contamination.
What are the main applications of flexible metal hoses?
Flexible metal hoses are widely used in industrial piping, HVAC systems, chemical plants, water supply, and gas transmission. They provide flexibility, absorb vibration, and compensate for thermal expansion and misalignment in both high- and low-pressure systems.
What materials are available for your flexible hoses?
Our flexible metal hoses are made from high-quality stainless steel (such as SS304 or SS316) with a braided metal outer layer for added strength and durability. We also offer hoses with custom materials to meet specific project requirements.
What connection types are available for flexible hoses?
We offer a wide range of connection types, including flanged, threaded, and quick-connect fittings. Our hoses can be customized to ANSI, DIN, JIS, and other international standards, making them suitable for global applications.
Can you supply custom sizes or OEM flexible hoses?
Yes, we provide OEM and ODM services. Flexible hoses can be manufactured in various diameters, lengths, and end fittings based on your drawings or requirements. Custom marking and packaging are also available.
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