The power steering hose connects the power steering pump to the cylinders that enables a vehicle to turn left and right easily. Also known as the power steering pump or PS pump, it takes a pressurized power steering fluid right into the steering rack and uses it to control a steering wheel's rate of turn.
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.