why is there a spring around hydraulic hose


Why Is There a Spring Around Hydraulic Hose?


Hydraulic systems are widely used in various industries for transmitting power using fluid pressure. These systems rely on hydraulic hoses to carry hydraulic fluid between different components. One noticeable feature of many hydraulic hoses is the presence of a spring wrapped around them. But why is there a spring around hydraulic hoses? In this article, we will explore the reasons behind the use of springs, their benefits, and their importance for ensuring proper functioning of hydraulic systems.

1. Definition and Purpose of Hydraulic Hoses:

Hydraulic hoses are flexible tubes designed to carry hydraulic fluid under high pressures to various hydraulic components like cylinders, valves, and motors. They are constructed using multiple layers of synthetic rubber or thermoplastic materials and reinforced with metal wires for strength and flexibility. These hoses play a crucial role in connecting hydraulic components, allowing the transmission of energy and control signals throughout the system.

2. Protection Against Abrasion:

One of the primary reasons for using a spring around hydraulic hoses is to protect them against abrasion and potential damage. Hydraulic hoses are often subjected to rough conditions, including heavy machinery, sharp edges, or abrasive surfaces. Without proper protection, these hoses can develop cuts, punctures, or wear, leading to leaks and system failures. The spring acts as a shield, covering the hose's outer surface, and prevents direct contact with the surrounding environment, reducing the risk of damage.

3. Preventing Hose Twisting and Kinking:

Another crucial function of the spring around hydraulic hoses is to prevent twisting and kinking. In hydraulic systems, hoses are often subject to movements, vibrations, or bending. If a hose twists or kinks, it can restrict the fluid flow, resulting in pressure drop or even blockage. The spring's spiral shape helps maintain the natural alignment of the hose, ensuring smooth flow and preventing any unwanted restriction.

4. Absorption of Vibration and Shock:

Hydraulic systems generate significant vibration and shock during operation. These vibrations can not only affect the performance of the system but also lead to accelerated wear and tear of the hydraulic hose. The spring surrounding the hose acts as a shock absorber, dampening the vibration and minimizing its transmission to the hose. By absorbing vibrations, the spring helps improve the durability and longevity of the hydraulic hose, reducing the likelihood of premature failure.

5. Enhancing Flexibility and Flexural Fatigue Resistance:

Flexibility is a vital characteristic of hydraulic hoses, allowing them to move freely and accommodate the movements of the hydraulic components they connect. The presence of a spring around the hose enhances its flexibility, making it more adaptable to different movements and positions. Moreover, the spring structure helps distribute the stress uniformly along the hose, preventing localized stress concentration that can lead to flexural fatigue and eventual rupture.


The spring surrounding hydraulic hoses plays a crucial role in protecting them against abrasion, preventing twisting and kinking, absorbing vibration and shock, and enhancing flexibility. These advantages directly contribute to the longevity and reliability of hydraulic systems by reducing the risk of hose damage, leakage, and system failures. By understanding the importance of the spring, hydraulic system designers and operators can ensure the proper functioning and longevity of their systems, resulting in enhanced productivity and cost savings.


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