公开(公告)号：US11746795B2

公开(公告)日：2023-09-05

申请号：US17353002

申请日：2021-06-21

Applicant: GRUNDFOS HOLDING A/S

Inventor： Alessandro Iacoponi ,  Riccardo Dal Canto

IPC: F04D27/00 ,  F04D1/00 ,  F04D29/22 ,  F04D29/42 ,  F04D9/02 ,  F04D15/00 ,  F04D1/06 ,  F04D9/00

CPC classification number: F04D27/008 ,  F04D1/00 ,  F04D1/06 ,  F04D9/005 ,  F04D9/02 ,  F04D15/0005 ,  F04D29/22 ,  F04D29/426

Abstract: A centrifugal pump device has at least one impeller (16), a circulation connection between a delivery side (22) of the at least one impeller (16) and a suction side (20) of the at least one impeller (16), and a valve arrangement (30, 46) in said circulation connection (44, 54). The valve arrangement (30, 46) has a first valve mode providing a pressure dependent shut-off valve (46) in the circulation connection. The valve arrangement (30, 46) allows a change between the first valve mode and at least one further valve mode. The at least one further valve mode provides at least one fixed closing degree of the circulation connection (44, 54).