Patent ID: 11891987
Assignee: SCHWING GMBH
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 16:
17. A piston pump comprising:
a differential cylinder drive with first and second differential cylinders that are configured and arranged to drive respective first and second conveying pistons that are movable in respective first and second conveying cylinders, each of the first and second conveying pistons arranged to be driven via respective first and second differential cylinders for operating the piston pump, a hydraulic circuit is configured to control the differential cylinder drive and/or to drive the differential cylinder drive by the action of hydraulic fluid,
wherein the hydraulic circuit is controlled to effect:
in a first phase, pre-compression of sucked-in material in at least one of the first and second conveying cylinders at a first conveying piston speed by acting on the associated differential cylinder with the hydraulic fluid at a first volume flow and at a first pressure, and
in a second phase, pre-compression of the sucked-in material in the at least one of the first and second conveying cylinders at a second conveying piston speed, which is lower than the first conveying piston speed, by acting on the associated differential cylinder at a second volume flow and at a second pressure,
wherein the second volume flow is lower than the first volume flow and the second pressure is higher than the first pressure.