Variable vane pump, pilot operated

The pump sucks fluid via connection S and displaces it while pressure at connection P is below the zero stroke pressure p0, set on the pressure controller. Starting at a pressure of p0 – p_reg the control piston gets deflected and the flow is reduced. The leakage flow at maximum pressurep_max is regulated by q_L.

The average control time for on-stroke control and off-stroke control is defined by t_ctr.

The maximum theoretical flow is defined by the product of V and rpm. The actual maximum flow can be limited by setting q_max. To take effect, q_max has to be less than the maximum theoretical flow.