EP 0561494 A2 19930922 - Moineau-type pump.
Title (en)
Moineau-type pump.
Title (de)
Exzenterschneckenpumpe.
Title (fr)
Pompe moineau.
Publication
Application
Priority
ZA 921133 A 19920217
Abstract (en)
A positive displacement pump 10 includes a pressure chamber 62 having a pumping outlet 79 connected to a delivery conduit 58. The pump 10 includes a bypass outlet 64 connected to the pressure chamber and a valve 70 in the bypass outlet. The valve 70 is open when the pump is not operative and closes automatically when a predetermined pumping volume is attained. The pump may advantageously be a submersible progressive cavity pump, the delivery conduit being a rising main having a foot valve 80 associated therewith. The bypass outlet is in communication with a body of fluid external of the rising main, eg with a borehole. Initially, during start-up, delivery of the pump is directed via the bypass outlet against a low head or substantially no head. Only after start-up, is the delivery directed via the pumping outlet 79, into the delivery conduit at a head prevailing in the rising main 58. <IMAGE>
IPC 1-7
IPC 8 full level
F04C 14/06 (2006.01); F04C 15/00 (2006.01)
CPC (source: EP)
F04C 14/06 (2013.01); F04C 15/0053 (2013.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0561494 A2 19930922; EP 0561494 A3 19931103; AU 3297193 A 19930819; ZA 93900 B 19930910; ZW 1993 A1 19930602
DOCDB simple family (application)
EP 93300805 A 19930203; AU 3297193 A 19930210; ZA 93900 A 19930209; ZW 1993 A 19930201