Function of suction throttle valve
The oil flow flows before the tandem pump through the suction throttle valve. The control unit for vertical dynamics management activates the suction throttle valve when the vehicle is being driven straight ahead. Activation is carried out when the vehicle is being driven straight ahead as well as when the vehicle is stationary (engine running). This lowers the loss due to unnecessary pump output.
The tandem pump's delivery rate remains proportional to the pump's rotation rate as long as this rate remains below the tandem's pump's governed maximum (corresponding to an engine speed of roughly 1000 rpm).
| Item | Explanation |
|---|---|
| 1 | Tandem pump (power steering pump and active roll stabilization) |
| 2 | Connection for radial piston pump |
| 3 | Connection for vane-type compressor |
| 4 | Suction throttle valve |
| 5 | two-pin plug connection |
| 6 | Supply to tandem pump |
| 7 | ECO valve (power steering pump) |