A hydraulic vane pump includes a plurality of members forming a recession
and an orifice in fluid communication with one another and with rotating
vane cells at an inlet sector of the pump. Air entrained in the vane
cells is exhausted through the recession and the orifice prior to fluid
passing from the inlet sector to a discharge sector, thereby increasing
pump capacity and decreasing cavitation noise. A method of pumping fluid
in a vane pump to decrease cavitation noise is also provided.