A power steering apparatus (10) includes a first pump (24) which is
continuously driven to supply fluid under pressure to a power steering
motor assembly (18). A second pump (32) is driven by the engine (30) of
the vehicle when a predetermined vehicle operating condition occurs. The
predetermined vehicle operating condition may, if desired, be operation
of the engine (30) of a vehicle at a speed which is less than a
predetermined speed. A flow control valve (40) directs fluid flow from
the first and second pumps to the power steering motor assembly (18)
during operation of both pumps. A diverter valve (62) directs fluid from
the first pump (24) along a fluid flow path which is spaced from the flow
control valve (40) during operation of only the first pump. The first
pump (24) may, if desired, be smaller than the second pump (32).