Hydraulic hose specifications and features

When choosing the right hydraulic hose, it is important


When choosing the right hydraulic hose, it is important to consider its specifications and characteristics. These include pressure rating, abrasion resistance and flexibility.

For safety reasons, the return line should be larger than the pressure line (see manufacturer’s numbered drawing). Additionally, bending the hose in more than one plane will shorten its service life.

How to extend the service life of hydraulic hoses
Hydraulic hoses are a critical component of any hydraulic system, carrying pressurized fluid to and from pumps, motors, valves and actuators. These hoses must be flexible enough to bypass equipment constraints and span long distances, but also durable enough to withstand high operating pressures and temperatures. They are often made from multiple layers of materials, including elastomers, fluoropolymers, thermoplastics and textiles.

The inner tube of a hose is usually made from a synthetic rubber such as nitrile (ACN) or a mixture of butadiene and acrylonitrile. The material of the inner tube determines the hose’s compatibility with fluids and its resistance to abrasion, heat, oil degradation, low-temperature bending, and chemical attack.

A reinforcement layer of braided or spirally wound wire surrounds the inner tube, giving the hose its strength and pressure rating. The outer layer of the hose is usually made of rubber or thermoplastic to protect the inner tube and provide environmental protection.

In order to obtain the longest acceptable service life of hydraulic hoses, all components must be matched and assembled according to the manufacturer’s recommendations. This includes couplings, which are either permanent or field attachable and classified as screw-connected or clamped types. The mechanical interface of the coupling to the hose must be compatible with the selected threaded end of the hose to ensure a leak-free connection.

The inner steel wire layer of a hydraulic hose can break for a number of reasons
The inner layer of the hydraulic hose is composed of pipe and steel wire reinforcement. The material of the tube depends on the liquid it carries. For example, many manufacturers use polymers or thermoplastics that are compatible with petroleum-based fluids. Always consult the chemical compatibility chart before selecting the appropriate hose for your application.

Overpressure is the primary cause of hose failure. Overpressure occurs when the actual system pressure exceeds the rated operating pressure. This can cause the hose assembly to suddenly rupture. It is recommended to use a voltage limiter to control this problem.

Another common cause of hose failure is excessive bending. All bends will affect the service life of the hose to some extent, but twisting is more damaging than a simple bend. Twisting the hose creates a larger gap between the braided and wrapped wires, significantly shortening the hose’s ability to withstand pressure.

Finally, extreme temperatures can also affect hose life. High temperatures can cause rubber and plastic materials to melt or degrade. If the hose is not properly insulated, it will stiffen under pressure. A good solution is to choose a higher temperature hydraulic oil, or a hose that can withstand high temperatures.

Main raw materials for manufacturing hydraulic hoses
Modern hydraulic hoses usually consist of three parts: the tube that carries the fluid, the outer layer, and the reinforcement layer. Hydraulic hoses are primarily made of synthetic rubber, thermoplastics, and PTFE (also known as Teflon). The material used for the reinforcement determines how much pressure the hose can withstand. It also depends on the fluid it is designed for. For example, neoprene is a chlorine-based polymer elastomer with excellent aging resistance, flame retardancy, oil resistance, solvent resistance and breathability. Poor low temperature flexibility.

The outer layer of hydraulic hoses should be weather- and oil-resistant to protect them from abrasion and chemicals. It should be able to withstand temperatures above 100 degrees. It is also recommended to use a coupling that is permanently connected to the hose. These couplings are cold formed on the hose using power machinery. They provide a more reliable connection.

The demand for hydraulic hoses is expected to increase due to the growing use of equipment in the construction industry such as bulldozers and excavators. Additionally, demand for energy-efficient green buildings is expected to drive market growth. Hydraulic hoses that carry fluid over long distances are critical to the movement of such machines. They can be suitable for conveying gaseous liquids, but the outer shell must have micropores.

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