EP 0664398 B1 19980722 - Centrifugal pump with backflow prevention valve
Title (en)
Centrifugal pump with backflow prevention valve
Title (de)
Kreiselpumpe mit den Rückfluss verhinderndem Ventil
Title (fr)
Pompe centrifuge avec clapet de non-retour
Publication
Application
Priority
DE 4401658 A 19940121
Abstract (en)
[origin: EP0664398A1] The pump has the delivery medium emerging from the last stage is pressed into a ring space (13) surrounding the stages, from which it flows to the outlet. The back flow valve (10-12) is arranged abutting the ring space. It is arranged in the flow direction behind the pump, partic. behind the last pump stage, and near the bearing and/or the shaft seal (5) which is turned away from the pump suction and pressure connections (6, 7). The back flow valve surrounds a chamber (9) with a ring membrane (12), into which the pump and partic. the last pump stage delivers. The support surface for the ring membrane is formed by an externally conically formed support part (10) with through flow apertures (11) located inside the ring membrane.
IPC 1-7
IPC 8 full level
F04D 1/06 (2006.01); F04D 15/00 (2006.01)
CPC (source: EP)
F04D 1/066 (2013.01); F04D 15/0083 (2013.01)
Designated contracting state (EPC)
BE DE ES FR GB IT
DOCDB simple family (publication)
EP 0664398 A1 19950726; EP 0664398 B1 19980722; DE 4401658 A1 19950727; DE 59502855 D1 19980827; ES 2119237 T3 19981001
DOCDB simple family (application)
EP 95100590 A 19950118; DE 4401658 A 19940121; DE 59502855 T 19950118; ES 95100590 T 19950118