Suzuki SY413 Service Manual page 1502

1. Rod
2. Orifice A 4. From pump
1
3. To gear box 5. To pump
Increase in engine speed
FLOW CONTROL VALVE
As the discharge rate of the P/S pump increases in proportion to
the pump revolution speed, a flow control valve is added to control
it so that the optimum amount of fluid for steering operation is sup-
plied according to the engine speed (driving condition).
Described below is its operation at different engine speed.
When Idling
The fluid discharged from the pump is supplied through the clear-
ance around the rod in orifice A
When Running at Low Speed
As the engine speed rises, the pump discharge rate increases and
causes a pressure difference to occur between both ends of the ori-
fice (P – P
1
force pushes the flow control valve to the right in left figure, making
the opening in the orifice narrower through which only a necessary
amount of fluid is fed to the gear box and the excess fluid is re-
1. Flow control
turned to the pump.
valve
2. Flow control
spring
When Running at High Speed
As the engine speed rises higher, opening in the orifice is made
narrower and fluid flow to the gear box reduces. As a result, hy-
draulic pressure application is slow at the start of the steering
wheel turn. This provides straight-ahead stability to suit the driving
condition with the steering wheel operated near its neutral position.
POWER STEERING (P/S) SYSTEM 3B1-5
to the gear box.
1
). Thus the pressure exceeding the flow control spring
2