Pump output control 1

[BEMPE16524]

Dear All,

I have a system where the pump (Rexroth AA10VSO Series 31) output is controlled by means of a control valve pack.
I'm just wondering how can the output be controlled if the pump shaft speed is same as drive motor speed and the speed is constant throughout the process.
Sorry, I'm not a pump expert. Someone told me it is the swashplate of the pump that plays the control part. But I can't relate it with the constant shaft speed.
Please enlighten me.

R.Efendy

 

[TugboatEng]

That pump has a continuously variable displacement. The swash plate angle sets the displacement of the pump. The swash plate in that particular pump can also reverse the direction of flow.

https://youtu.be/le-VolW-QE8

 

[BEMPE16524]

Got it. The 'x' pilot pressure is actually controlling the swash plate angle. So even the shaft speed is constant, by varying the angle of the swash plate, user will get different output flow respectively. Thank you.

R.Efendy