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

Claim 18:
19. The piston pump of claim 17, wherein the hydraulic circuit comprises:
a main hydraulic source configured to drive the first and second differential cylinders when material to be conveyed is sucked into the first and second conveying cylinders and when sucked material is discharged from the first and second conveying cylinders; and
an auxiliary hydraulic source configured to drive the first and second differential cylinders during pre-compression material to be conveyed in the first and second conveying cylinders before discharge of pre-compressed material,
wherein each of the first and second differential cylinders, at least at times, for pre-compression in the associated conveying cylinder, can be acted upon simultaneously by the main hydraulic source and the auxiliary hydraulic source from the hydraulic circuit with the hydraulic fluid.