Patent Number: 6,168,398

Title: Piston pump having lifting valves with a convex surface

Abstract: A piston pump comprising at least one working space, which is surrounded by a cylinder and which is adapted to be varied by a piston arranged in said cylinder, and at least one inlet valve as well as at least one outlet valve, said valves being lifting valves and being adapted to be controlled and driven by a control and drive means. In order to provide a piston pump which can be cleaned more easily and which includes the smallest possible number of dead spots, a first teaching according to the present invention suggests that, when closed, the inlet valve should be located nearer to the working space than when it is open. Alternatively, the underlying technical problem is solved according to a second solution of the present invention by the feature that the valve surface of the inlet and/or outlet valve(s) facing the working space merges without any steps with the inner surface of said working space at the closed position of the valve or of each valve.

Inventors: Handtmann; Thomas (88400 Biberach, DE)


International Classification: F04B 53/10 (20060101); F01L 3/08 (20060101); F04B 53/16 (20060101); F01L 3/20 (20060101); F01L 3/00 (20060101); F04B 53/00 (20060101); F04B 7/00 (20060101); F04B 15/02 (20060101); F04B 15/00 (20060101); F04B 007/00 ()

Expiration Date: 01/02/2018