Vision V6-3.5L VIN F (1997)
HIGH PRESSURE
When the high pressure area of the power steering pump is filled with power steering fluid. Power steering fluid then flows under the vanes in the
rotor slots, forcing the vanes to follow the inside oval surface of the cam ring. As the vanes reach the restricted area of the cam ring, oil is forced
out from between the vanes. When excess oil flow is generated during high-speed operation. A regulated amount of oil returns to the pump intake
side through a flow control valve. The flow control valve reduces the power required to drive the pump and holds down temperature build-up.
When steering conditions exceed maximum pressure requirements, such as turning the wheels against the stops. The pressure built up in the
steering gear also exerts pressure on the spring end of the flow control valve. This end of the valve houses the pressure relief valve. High pressure
lifts the relief valve ball from its seat and allows oil to flow through a trigger orifice located in the outlet fitting. This reduces pressure on the
spring end of the flow control valve which then opens and allows the oil to return to the intake side of the pump. This action limits maximum
pressure output of the pump to a safe level.
Under normal power steering pump operating conditions. The pressure requirements of the pump are below maximum, causing the pressure relief
valve to remain closed.
