Table of Contents

Introduction to Hydraulic Hoses

Hydraulic hoses play a pivotal role in various industrial applications by conveying hydraulic oil to components, valves, actuators, and tools. These specialized hoses are designed to withstand high pressures, loads, and extreme temperatures, making them indispensable in heavy-duty functions such as stamping, forging, lifting equipment, and aircraft wing flaps.

Construction of Hydraulic Hoses

Understanding the construction of hydraulic hoses is essential for their proper application and maintenance. These hoses are typically composed of three layers: the inner tube, a reinforcing middle layer, and a protective outer layer.

wire spiral hose EN856 4SH (DIN20023 4SH)
wire spiral hose EN856 4SH (DIN20023 4SH)

Inner Tube

The inner tube is crafted from materials like synthetic rubber, polycarbonate, or PTFE, designed to be flexible and compatible with the hydraulic fluid being conveyed.

Reinforcing Middle Layer

This layer is usually made from coiled wire or fabric braiding, providing the strength needed to withstand the extreme pressures of a hydraulic system while maintaining flexibility.

Protective Outer Layer

The outer layer serves as a shield against contaminants, extreme weather conditions, abrasive equipment, and sharp objects, ensuring the hose’s longevity and functionality.

Fittings and Connectors

The fittings that connect the hydraulic hose to its source and destination must also be robust enough to handle extreme pressure, ensuring a secure and leak-free connection.

Standards and Specifications

The Society of Automotive Engineers (SAE) has set specific criteria for hydraulic hoses to ensure reliability and safety. The SAE J517 standard outlines the general, dimensional, and performance specifications for hydraulic hoses in both mobile and stationary systems.

hydraulic hose
hydraulic hoses

Types of Hydraulic Hoses

There are several types of hydraulic hoses designed for different applications and requirements:

Low Pressure Applications Hose

This hose is extremely flexible and textile-braided, suitable for lighter applications like return lines, anti-static delivery lines, and air or lube lines. However, it is not suitable for braking or other safety applications.

Standard Hose for High Pressure Applications

Flexible and durable, this hose is used for transferring mineral and hydraulic oils as well as water/oil emulsions. It is widely used in mining, oil industries, construction, and agriculture.

Hydraulic Rubber Hose Wire Spiral Hose EN8564SH/DIN200234SH China Manufacturer
Hydraulic Rubber Hose Wire Spiral Hose EN8564SH/DIN200234SH China Manufacturer

Hose with Steel Wire Braiding

Featuring either double or single wire braiding, this hose is used for transferring fluids under extreme pressures, temperatures, and vacuums, making it ideal for oilfields, mining, and heavy industrial applications.

 Two Wire Braid Hose EN8532T(DIN200222SN)
Two Wire Braid Hose EN8532T(DIN200222SN)

Plastic Hose

Constructed with thermoplastic layers and reinforced with a fiber net, the plastic hose is abrasion-resistant and operates at extremely low temperatures. It is beneficial for heavy construction, hydraulic lift equipment, and lubrication lines.

Applications and Uses

Hydraulic hoses are integral to the operation of a myriad of equipment, from aircraft wing flaps to excavators and backhoes. Their versatility and durability make them a staple in various industries, ensuring the smooth operation of hydraulic systems.

Considerations for Selection

Selecting the right hydraulic hose involves considering factors like pressure rating, durability, flexibility, abrasion resistance, temperature exposure, and material compatibility. These considerations are crucial to prevent malfunctions and ensure the safety and efficiency of hydraulic operations.

Conclusion

Hydraulic hoses are essential components in various industrial applications, designed to withstand extreme conditions and convey hydraulic fluids effectively. Understanding their construction, types, applications, and selection criteria is crucial for optimizing their performance and ensuring the safety and efficiency of hydraulic systems.

FAQs

  1. What are the main components of a hydraulic hose?
    • A hydraulic hose is typically made of three layers: an inner tube, a reinforcing middle layer, and a protective outer layer, along with fittings and connectors.
  2. Why are standards like SAE J517 important for hydraulic hoses?
    • Standards like SAE J517 ensure the reliability, safety, and performance of hydraulic hoses, which are critical for both mobile and stationary systems.
  3. Can low-pressure application hoses be used for safety applications?
    • No, low-pressure application hoses are not suitable for safety applications like braking.
  4. What are the considerations for selecting the right hydraulic hose?
    • Considerations include pressure rating, durability, flexibility, abrasion resistance, temperature exposure, and compatibility with the material being conveyed.
  5. Where are hydraulic hoses commonly used?
    • Hydraulic hoses are used in various industries such as aviation, construction, mining, and agriculture, for applications like aircraft wing flaps, lifting equipment, and hydraulic lift equipment.
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