Patent ID: 6206663
Filing Date: 2001-03-27
Classification: F04B,H01R

Abstract:
A piston pump for delivering a fluid at low pressure and at a higher pressure, a higher delivery volume being provided in one pumping cycle at low pressure than at a high pressure, said piston pump comprising:a low-pressure delivery piston, which is moved inside a pump cylinder and acts upon a pressure chamber under prestress into a delivery end position;a high-pressure delivery piston;an inlet valve and an outlet valve;a fluid delivery path provided between the inlet valve and the outlet valve; andthe low-pressure delivery piston being able to be moved back counter to its prestress into a delivery starting position, characterized in that the fluid delivery path passes through the low-pressure delivery piston, that a valve is provided in the low-pressure delivery piston, which valve shuts in the case of movement into the delivery starting position, in that the high-pressure delivery piston and the low-pressure delivery piston operate in a common pressure chamber, and in that the high-pressure delivery piston moves the low-pressure delivery piston counter to its prestress.