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Over the years, power steering has become a standard equipment item
on many automobiles. The demand for this system has caused power
steering to be installed on over 90%% of all domestic new car
production. All systems require a power steering pump attached to the
engine and driven by a belt, a pressure hose assembly, and a return
line. Also, a control valve is incorporated somewhere in the
hydraulic circuit. "Power steering" is really "power assisted
steering." All systems are constructed so that the car can be steered
manually when the engine is not running or if any failure occurs in
the power source.
Most power steering pumps contain a flow control valve, which limits
fluid flow to the power cylinder to about two gallons per minute, and
a relief valve which limits pressure according to system demands.
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