Subaru 2002 Impreza Service Manual page 360

POWER STEERING SYSTEM
Power Assisted Svstem (Power Steerina)
As the pump speed increases, pressure P increases further, pushing the valve spool further
to the right. As a result, orifice 2 opens allowing part of fluid to return to the pump circuit. Accord-
ingly, a constant flow of oil is maintained.
Pump speed range: B to D
NF0384
(1)
To gear box
(2) Orifice 1
(3) Valve spool
(4)
Orifice
2
0
When the pump speed further increases, the valve spool is pushed fully to the right. Now, ori-
fice 1 is restricted while orifice 2 opens wide. Oil flow to the gear box is thus maintained at a low
rate.
Pump speed range: D to E
NF0385
(1) To gear box
(2)
Orifice
1
(3) Orifice 2
PS-16