Pump casing

Claim 1

A PUMP CASING ASSEMBLY ADAPTED FOR RECEIVING A ROTARY IMPELLER MOUNTED UPON A SHAFT, THE ROTARY IMPELLER BEING ANY ONE TYPE OF ROTARY IMPELLER SELECTED FROM A PLURALITY OF DIFFERENT TYPES OF ROTARY IMPELLERS, EACH OF THE PLURALITY OF TYPES OF ROTARY IMPELLERS HAVING A PUMP CASING COVER AND MEANS FOR SEALING SAID SHAFT WITH RESPECT THERETO, SAID PUMP CASING ASSEMBLY COMPRISING A STANDARDIZED PUMP CASING HAVING A PAIR OF WALL PORTIONS DISPOSED OPPOSITE AND SPACED APART FROM ONE ANOTHER AND AN ANNULAR WALL PORTION CONNECTING TOGETHER SAID PAIR OF WALL PORTIONS, SAID ANNULAR WALL PORTION HAVING AN OUTLET OPENING FOR SAID CASING, ONE OF SAID PAIR OF WALL PORTIONS HAVING AN ADDITIONAL OPENING DISPOSED THEREIN FOR RECEIVING THE IMPELLER AND SHAFT, SAID ONE WALL PORTION ADJACENT SAID ADDITIONAL OPENING BEING ADAPTED TO ENGAGE THE PUMP CASING COVER WHEN THE IMPELLER IS DISPOSED WITHIN SAID CASING, THE OTHER OF SAID PAIR OF WALL PORTIONS HAVING AN INLET OPENING; AND AN INSERT MEMBER DISPOSED ADJACENT TO SAID OPENING AND BEING EXPOSED TO THE INTERIOR OF SAID CASING, SAID INSERT MEMBER BEING ANY ONE FORM OF A PLURALITY OF DIFFERENT FORMS OF INSERT MEMBERS EACH OF THE PLURALITY OF INSERT MEMBERS HAVING A CYLINDRICAL OPENING FOR DIRECTING THE FLOW OF FLUID MOVING THROUGH SAID INLET OPENING TOWARD THE IMPELLER AND CERTAIN OF THE PLURALITY OF INSERT MEMBERS ADDITIONALLY HAVING MEANS FOR GUIDING THE FLUID FOR RECIRCULATION WITHIN THE CASING, WHEREBY SAID STANDARDIZED PUMP CASING CAN BE SELECTIVELY ASSEMBLED WITH ANY ONE TYPE OF THE PLURALITY OF TYPES OF ROTARY IMPELLERS.