Wear resistant pumps

Claim 1

A CENTRIFUGAL PUMP FOR PUMPING ABRASIVE AND CORROSIVE FLUIDS COMPRISING A PAIR OF OPPOSING, HOLLOW, ROUND, METAL CASING MEMBERS FORMING A CASING CHAMBER OF A CENTRIFUGAL PUMP; A MULTI-VANE, ROTARY, CENTRIFUGAL PUMP IMPELLER ROTATABLY MOUNTED IN SAID CASING CHAMBER; A METAL, CYLINDRICAL, PUMP INLET SLEEVE ON ONE OF SAID METAL CASING MEMBERS AND EXTENDING OUTWARDLY THEREFROM OPPOSITE THE RADIAL CENTER PORTION OF SAID IMPELLER; A CIRCULAR FLANGE EXTENDING RADIALLY OUTWARDLY FROM THE OUTER EDGE OF SAID PUMP INLET SLEEVE, AND ADAPTED TO BE USED TO COUPLE SAID SLEEVE TO A FLANGED PIPE; THE OTHER OF SAID METAL CASING MEMBERS HAVING A HOLE OPPOSITE THE RADIAL CENTER PORTION OF SAID IMPELLER; A SEMICYLINDRICAL, METAL, PUMP OUTLET MEMBER ON THE RADIALLY OUTER PORTION OF EACH OF SAID CASING MEMBERS, SAID SEMICYLINDRICAL MEMBERS BEING IN OPPOSING RELATIONSHIP AND FORMING A CYLINDRICAL, CASING PASSAGE DIRECTED TANGENTIALLY WITH REFERENCE TO SAID PUMPING CHAMBER; A PAIR OF OPPOSING, ROUND, HOLLOW LINERS, EACH WITH A SEMICYLINDRICAL WALL PORTION IN OPPOSING RELATIONSHIP TO THE OTHER WALL PORTION AND DIRECTED TANGENTIALLY FROM THE RADIAL OUTER PORTIONS AND FORMING A CYLINDRICAL, FLUID DISCHARGE, LINER PASSAGE EXTENDING TANGENTIALLY FROM THE CENTRIFUGAL PUMPING CHAMBER FORMED BY SAID OPPOSING, ROUND, HOLLOW LINERS; A CYLINDRICAL SLEEVE LINER EXTENDING OUTWARDLY FROM THE RADIAL CENTER PORTION OF A SIDE OF ONE SAID ROUND, HOLLOW LINERS; SAID HOLLOW LINERS BEING SEATED IN SAID METAL CASING MEMBERS, SAID SEMI-CYLINDRICAL WALL PORTIONS BEING SEATED IN SAID CYLINDRICAL CASING PASSAGE, AND SAID LINER SLEEVE BEING SEATED IN SAID METAL, INLET SLEEVE; OUTWARDLY-DIRECTED FLANGES ABOUT THE PERIPHERY OF THE OPPOSING EDGES OF SAID ROUND, HOLLOW LINERS AND SEMICYLINDRICAL WALL PORTIONS; MEANS HOLDING SAID METAL CASING MEMBERS IN RIGID, OPPOSING RELATIONSHIP; MEANS ON SAID METAL CASING MEMBERS AND SAID METAL, SEMICYLINDRICAL, PUMP OUTLET MEMBERS PRESSING AGAINST SAID LINER FLANGES AND HOLDING THE LINER FLANGES IN ABUTTING, FLUID-TIGHT CONTACT; A SECOND, HOLLOW, SLEEVE PROJECTING OUTWARDLY FROM SAID ROUND, HOLLOW LINER