Patent ID: 7510044

Claim:
An apparatus for use in turning steerable vehicle wheels, said apparatus comprising: a power steering motor assembly connected with the steerable vehicle wheels; a first pump which is connected with said power steering motor assembly and is continuously driven by an engine of the vehicle, during operation of the engine, to supply fluid under pressure to said power steering motor assembly; a second pump which is connected with said power steering motor assembly and is driven by the engine of the vehicle when the operating speed of the engine is less than a predetermined speed; a flow control valve which is connected with said power steering motor assembly and said first and second pumps, said flow control valve directs fluid flow from said first and second pumps to said power steering motor assembly during operation of both said first pump and said second pump; and a diverter valve which is connected with said power steering motor assembly and directs fluid flow from said first pump to said power steering motor assembly along a fluid flow path which is spaced from said flow control valve when the operating speed of the engine is greater than the predetermined operating speed.