Power Steering Hose
Aside from its use in power steering lines, it is also being utilized in hydraulics, air, fuel and lubricating oil applications. It contains resistant fabric cover and a patented synthetic rubber tube and is outfitted with standard steel reusable fittings. A hydraulic pump driven by a belt from a crankshaft pulley to provide up to 1,300 psi (8,964kPa) of "boost" pressure needed to operate the power-steering system.
The power steering systems are made up of two hoses - a high-pressure hose and a low-pressure hose. Made up of a reinforced synthetic compound, the high-pressure hose have hose fittings that are usually double-flared compression fittings while the low-pressure hose may not use compression fittings due to the lesser amount of pressure that passes through it. Additionally, the high-pressure (supply) hose carries high-pressure oil from the power steering pump to the steering gear and the low-pressure (return) hose brings oil from the steering gear back to the pump or its reservoir.
To perform these heavy-duty requirements, a high-pressure power steering hose must be able to handle fluid at peak temperatures as high as 150 degrees Celsius and pulsed pressures from 0 to 115 bar at 30 to 40 cycles per minute for up to 500,000 cycles without leakage. These stringent auto-industry specifications also require that such hoses must remain leak-free following a 20 cycle cold start test run at -40 degree Celsius.