Pressure loaded gear pump

Claim 1

A GEAR PUMP COMPRISING, A HOUSING HAVING A PUMPING CHAMBER INCLUDING AN INLET AND AN OUTLET, ROTARY GEARS FOR PUMPING FLUID FROM THE INLET TO THE OUTLET, SAID CASING HAVING A WALL ON ONE SIDE OF SAID CHAMBER OPPOSITE THE ADJOINING SIDE FACES OF THE GEARS CHARACTERIZED BY A RELIEF RECESS OPPOSITE SAID PUMPING CHAMBER AND A SEALING SURFACE OUTWARDLY OF SAID RELIEF RECESS, AN END PLATE INTERPOSED BETWEEN SAID GEARS AND SAID WALL HAVING A SEALING FACE ON ONE SIDE THEREOF FOR ENGAGING THE SIDE FACES OF THE GEARS AND A MOTIVE FACE ON THE OTHER SIDE THEREOF TO FORM A WALL OF SAID RELIEF RECESS, SAID END PLATE HAVING AT LEAST ONE OPENING OPPOSITE THE OUTLET SIDE OF THE PUMP FOR CONDUCTING FLUID AT PUMP GENERATED PRESSURE INTO SAID RELIEF RECESS, AND AN ELONGATED SEALING MEMBER HAVING ITS OPPOSITE ENDS CLAMPED BETWEEN SAID SEALING SURFACE AND SAID MOTIVE FACE AT SPACED APART POINTS ON THE INLET SIDE OF THE PUMP AND HAVING AN INTERMEDIATE SECTION CURVED THROUGH SAIF RELIEF RECESS ON THE OUTLET SIDE OF THE PUMP, THEREBY TO PARTITION THE RELIEF RECESS INTO A PRESSURE CONTROL ZONE COMMUNICATING WITH SAID OPENING TO LOAD A CORRESPONDING AREA OF SAID MOTIVE FACE WITH DISCHARGE PRESSURE, AND A REDUCED PRESSURE ZONE ON THE INLET SIDE OF THE PUMP.