What is a hydraulic hose and how is it made
A hydraulic hose has three layers. The inner tube of oil-resistant synthetic rubber is in contact with the medium, the reinforcement of textile braid or steel wire takes the pressure, and the outer cover, resistant to weathering, ozone and abrasion, protects the hose from external damage. The number and type of reinforcement layers determine the working pressure: textile braid for lower pressures, one or two layers of braided steel wire for medium and high pressures, and four spiral layers of steel wire for very high pressures and impulse loads.
Types of hydraulic hoses in the Fadip range
EN 854 2TE with textile reinforcement is designed for medium pressure hydraulics, heating oil, water and air, for pressures from 40 to 75 bar (DN6 to DN25).
EN 853 1SN (SAE 100 R1AT) with one steel wire braid covers DN6 to DN50 and pressures from 40 to 225 bar, while EN 853 2SN (SAE 100 R2AT) is the high pressure version, from 80 to 400 bar across the same size range.
EN 856 4SP (DN10 to DN25, up to 445 bar) and EN 856 4SH (DN20 to DN50, up to 420 bar) with four spiral steel wire layers are designed for very high pressures and hydraulics with pressure surges.
SAE 100 R7 TWIN is a lightweight twin thermoplastic hose with a small bend radius, for pressures up to 210 bar. SAE 100 R14, with a PTFE inner tube and stainless steel wire braid, works from -60 to +260 °C for steam, fuel, oil, gases and aggressive liquids, and the GČ hose is designed for liquid fuels.
How to choose a hydraulic hose
Five parameters need to be defined: size (inside diameter according to flow and permissible oil velocity), temperature of the medium and environment, application (moving or static part, bend radius, abrasion), medium (mineral oil, emulsion, fuel, water, air) and pressure. The maximum working pressure of the hose must be equal to or higher than the highest pressure in the system, including surges. The bend radius must not be smaller than specified, as this damages the hose and shortens its service life.
Technical specifications
Rubber hydraulic hoses operate at temperatures from -40 to +100 °C, briefly up to +125 °C. Inside diameters range from 6.4 mm (DN6) to 50.8 mm (DN50). Working pressure falls as diameter increases: for 2SN hose it is 400 bar at DN6 and 80 bar at DN50, and for 4SP hose 445 bar at DN10. The SAE 100 R14 PTFE hose works from -60 to +260 °C at pressures from 52 to 181 bar.
Hydraulic hose applications
Hydraulic hoses are used on agricultural machinery and tractors, construction equipment (excavators, loaders, cranes), hydraulic presses and power units, in shipbuilding, mining, municipal vehicles and woodworking and metalworking machinery. PTFE hoses are used in the chemical industry, on steam installations and for high temperature fuels.
Hoses and fittings in one place
Alongside hydraulic hoses we offer hydraulic fittings and ferrules for low, high and very high pressure, as well as industrial hoses for air, water, steam and chemicals. For pressure monitoring in hydraulics, see also our glycerine filled pressure gauges and gauge valves up to 400 bar.
For a quotation, send us the hose type or standard, inside diameter, working pressure, medium, temperature, length and fitting type. Our technical team will recommend a suitable solution within 24 hours. Contact us.
