Rotary piston action pumps

Claim 1

IN A MACHINE COMPRISING A HOUSING, END PLATES, INLET AND OUTLET PORTS, A CHECK VALVE IN ONE OF SAID PORTS, A ROTOR MOUNTED FOR ROTATION IN SAID HOUSING HAVING A SEALING CONTACT BETWEEN SAID END PLATES AND A LINE SEALING CONTACT ON THE PERIPHERAL WALL OF SAID HOUSING AS SAID ROTOR ROTATES, A VANE MOUNTED TO RECIPROCATE FROM AN OPEN END OF A VANE SLOT IN SAID HOUSING HAVING A SEALING CONTACT WITH SAID END PLATES AND SAID ROTOR, MEANS RECIPROCATING SAID VANE FROM SAID OPEN END OF SAID VANE SLOT THROUGH A CLEARANCE BETWEEN SAID HOUSING AND SAID ROTOR HOLDING ITS INNER END IN SAID SEALING CONTACT WITH SAID ROTOR AS IT ROTATES FORMING ON OPPOSITE SIDES OF SAID VANE LOW INLET AND HIGH PRESSURE FLUID CHAMBERS, A RELIEF ON SAID VANE STARTING FROM SAID SEALING CONTACT WITH SAID ROTOR TO THE FULL LENGTH OF SAID VANE STROKE ON SAID HIGH PRESSURE SIDE EXPOSING SAID RELIEF AREA TO SAID HIGH FLUID PRESSURE PROVIDING A UNIFORM TRANSVERSE HIGH PRESSURE THROUGHOUT ITS INWARD AND OUTWARD MOVEMENT, A RECESS ON SAID VANE NEAR ITS OUTER END AT THE CLOSED END OF SAID VANE SLOT ON SAID HIGH PRESSURE SIDE, A RECESS ON SAID VANE ON SAID LOW PRESSURE SIDE OF SAID VANE BEGINNING AT NEAR THE FULCRUM POINT AT SAID OPEN END OF SAID VANE SLOT WALL OPPOSITE SAID TRANSVERSE HIGH PRESSURE LOADING SIDE WHEN SAID VANE IS FULLY EXTENDED TO THE LENGTH OF SAID VANE STORKE, PORTS FROM SAID HIGH PRESSURE SIDE OF SAID VANE LEADING TO SAID RECESSES, RECESS AREA ON SAID VANE ON SAID LOW PRESSURE SIDE OF SAID VANE EQUALING THE AREA OF SAID RECESS ON SAID VANE ON SAID HIGH PRESSURE SIDE AND SAID VANE PLUS SAID RELIEF AREA ON SAID VANE EXPOSED TO SAID HIGH FLUID PRESSURE HYDRAULICALLY FLOATING SAID VANE IN SAID VANE SLOT BY BALANCING OUT SAID TRANSVERSE LOADING DURING ITS INWARD AND OUTWARD MOVEMENT AS SAID ROTOR ROTATES.