Fiber reinforced hydraulic hose
Detailed explanation of the pressure resistance grade of fiber-reinforced hydraulic hose: structure, use and adapter guide
1. Uses of fiber-reinforced hydraulic hose
Fiber-reinforced hydraulic hose is widely used in industry, engineering machinery and hydraulic transmission systems, mainly used to transmit high-pressure hydraulic oil, lubricating oil, emulsion and other media. Its main application scenarios include:
Engineering machinery: hydraulic systems of equipment such as excavators, loaders, cranes, etc.
Mining equipment: high-pressure pipelines of hydraulic supports, rock drills, and conveying machinery
Agricultural machinery: hydraulic lifting systems of tractors and harvesters
Industrial hydraulic systems: hydraulic power transmission of injection molding machines, die-casting machines, and machine tools
Shipping and marine engineering: deck machinery, steering gear hydraulic pipelines
This type of hose has the characteristics of high pressure resistance, wear resistance, and bending fatigue resistance, and is suitable for dynamic and static high-pressure environments.
2. Structure of fiber-reinforced hydraulic hose
Fiber-reinforced hydraulic hoses are usually composed of a multi-layer composite structure to ensure pressure resistance, flexibility and durability. Its typical structure includes:
Inner Tube
Material: Oil-resistant synthetic rubber (such as NBR, HNBR)
Function: Ensure medium sealing and prevent hydraulic oil penetration
Features: Corrosion resistance, high temperature resistance (40°C to +100°C)
Reinforcement Layer
Material: High-strength synthetic fiber (such as aramid, polyester fiber) or steel wire braiding/winding
Structure: 2~6 layers of cross-weaving to provide compressive support
Function: Withstand high pressure and prevent hose expansion or bursting
Cover
Material: Wear-resistant, UV-resistant rubber (such as CR, CSM)
Function: Protect the reinforcement layer to prevent mechanical damage and external corrosion
Fittings
Type: Flange, threaded, quick-change fittings, etc.
Material: Carbon steel, stainless steel (304/316)
Sealing method: O-ring, metal seal
3. Pressure rating of fiber-reinforced hydraulic hose
The pressure rating is a key indicator to measure the performance of hydraulic hoses, usually expressed as working pressure (WP) and burst pressure (BP):
Factors affecting the pressure rating:
1. Reinforcement layer material: Aramid fiber has higher pressure resistance than polyester fiber.
2. Braiding method: Cross braiding is more resistant to high pressure than spiral winding.
3. Joint quality: Poor quality joints will reduce the overall pressure resistance.
4. Use environment: High temperature or corrosive environment may reduce the pressure resistance.
4. Adapter type and selection guide
The performance of hydraulic hoses depends not only on the pipe body, but also on the joints. Common adapters include:
(1) Flange Fitting
Applicable pressure: high pressure (above 25 MPa)
Advantages: good sealing and vibration resistance
Applications: engineering machinery, ship hydraulic systems
(2) Threaded Fitting
Type: NPT (American Standard), BSP (British Standard), metric thread
Applicable pressure: medium and high pressure (10~42 MPa)
Advantages: easy installation and low cost
(3) Quick Coupling
Applicable pressure: medium and low pressure (5~25 MPa)
Advantages: quick disassembly and assembly, suitable for frequent replacement scenarios
(4) 37° flare fitting (JIC Fitting)
Applicable pressure: high pressure (above 35 MPa)
Advantages: metal sealing and impact resistance
Recommendations for fitting selection:
High pressure system: flange or 37° flare fitting is preferred
Dynamic pipeline: Use models with swivel joints to reduce bending stress
Corrosive environment: Choose stainless steel (316) joints
5. How to extend the service life of fiber-reinforced hydraulic hoses?
1. Correct installation: Avoid excessive bending, the minimum bending radius ≥ 5 times the outer diameter of the hose
2. Regular inspection: Check whether the outer layer is cracked and the joints are loose every 3 months
3. Avoid overpressure: The working pressure must not exceed 80% of the nominal value
4. Storage environment: Store in a cool and dry place, avoid direct sunlight
The pressure resistance level of fiber-reinforced hydraulic hoses depends on the reinforcement layer structure, material and joint quality. The pressure resistance range of standard products is usually between 5 and 70 MPa. Correct selection of adapters (such as flanges, threads or quick-change joints) can ensure the safe operation of the system. When purchasing, you should pay attention to international certifications (such as SAE, EN, ISO), and choose hoses with appropriate pressure resistance levels according to actual working conditions to ensure long-term and stable operation of the hydraulic system.
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