Patent ID: 7661936

Claim:
A piston pump for delivering hydraulic fluid, comprising a cylinder element ( 3 ), a piston mounted for movement back and forth in the cylinder element ( 3 ), a piston chamber ( 5 ) in which the piston ( 2 ) is able to exert pressure on the hydraulic fluid, an outlet valve ( 14 ), and a slot-controlled inlet valve ( 10 ) having at least one slot ( 6 , 7 , 8 , 9 ) that is oriented in the movement direction (X-X) of the piston, wherein the at least one slot is formed by a groove that is closed on one end and whose opening is oriented toward the interior of the cylinder element ( 3 ), and the groove extends in the direction of motion X-X of the piston, wherein the inlet valve comprises a multitude of slots ( 6 , 7 , 8 , 9 ), which are embodied so as to have cross-sectional areas or lengths which are different from one another.