Pump heads comprising at least two gear-pump chambers are disclosed. Each chamber comprises a housing which defines a corresponding pump cavity. Each cavity contains a driving gear and at least one driven gear and has a separate inlet and outlet. The pump cavities are hydraulically interconnected by...http://www.google.fr/patents/US5466131?utm_source=gb-gplus-shareBrevet US5466131 - Multiple-chamber gear pump with hydraulically connected chambers
Multiple-chamber gear pump with hydraulically connected chambers
