Rotary valve

1. A rotary valve for conveying fluids, powders or granular substances, said rotary valve comprising:

a rotor having a rotor shaft and vanes, and

a casing for housing the rotor within the interior of the casing, said casing comprising a removable casing end plate defining a rotor shaft aperture into which an end portion of the rotor shaft is insertable; wherein

said rotary valve comprises a rotor shaft support assembly,

said rotor shaft support assembly comprises said removable casing end plate and a bearing assembly for supporting an end portion of the rotor shaft inserted from the inner side of the removable casing end plate into the rotor shaft support assembly and through said rotor shaft aperture of the removable casing end plate,

said rotor shaft support assembly is adjustable to correct any deviation of the pitch of the rotor shaft from a level orientation relative to said removable casing end plate when the rotor shaft is supported at a single end only by the rotor shaft support assembly with the inserted end portion of the rotor shaft supported within the removable casing end plate and the bearing assembly,

said rotor shaft support assembly comprises a tail piece,

said tail piece comprises a substantially tubular body having inner and outer ends and a flange extending radially outwardly of the outer surface of the substantially tubular body,

said bearing assembly is disposed radially around the outer surface of the tail piece,

said end portion of said rotor shaft is removably locatable within said tail piece to be supported within the removable casing end plate and the bearing assembly, and

said bearing assembly comprises a bearing housing and inner and outer bearing adjustment rings each in threaded engagement with, and rotatable within, said bearing housing.

2. A rotary valve as claimed in claim 1 , wherein said flange is positioned axially between said inner and outer ends of said tail piece.

3. A rotary valve as claimed in claim 1 , wherein said bearing assembly further comprises a first, inner rolling bearing, a second, outer rolling bearing and a spacing ring disposed therebetween, all located between said inner and outer bearing adjustment rings.

4. A rotary valve as claimed in claim 1 , wherein said bearing assembly comprises a bearing housing and inner and outer bearing adjustment rings each in threaded engagement with, and rotatable within, said bearing housing, and

said flange of said tail piece is axially located between said inner and outer bearing adjustment rings.

5. A rotary valve as claimed in claim 1 , wherein said bearing assembly comprises a bearing housing and inner and outer bearing adjustment rings each in threaded engagement with, and rotatable within, said bearing housing,

said bearing assembly further comprises a first, inner rolling bearing, a second, outer rolling bearing and a spacing ring disposed therebetween, all located between said inner and outer bearing adjustment rings, and

said flange of said tail piece is axially located between said inner bearing adjustment ring and said first, inner rolling bearing.

6. A rotary valve as claimed in claim 5 , wherein said inner bearing adjustment ring comprises an annular abutment shoulder that extends outwardly and axially over the flange of said tail piece and abuts said first, inner rolling bearing.

7. A rotary valve as claimed in claim 6 , wherein the outer bearing adjustment ring abuts the second, outer rolling bearing.

8. A rotary valve as claimed in claim 1 , wherein said bearing housing defines a threaded aperture within which a fine adjustment screw is received, said fine adjustment screw in contact with and rotatable against the removable casing end plate.

9. A rotary valve as claimed in claim 1 , wherein said removable casing end plate defines a threaded aperture within which a screw is received, said screw in contact with and rotatable against an outer surface of the inner bearing adjustment ring.

10. A rotary valve as claimed in claim 1 , wherein

a threaded aperture is defined in the end of said end portion of the rotor shaft,

a threaded aperture is defined in the end of the outer end of the substantially tubular body of said tail piece, and

said rotor shaft support assembly further comprises:

a rotor shaft securing screw,

a tail piece securing screw, and

a retaining washer defining apertures corresponding to said threaded apertures of the rotor shaft and the tail piece;

the rotor shaft and said tail piece being fixed to rotate together when the rotor shaft and tail piece securing screws extend through the retaining washer and are in threaded engagement with the rotor shaft and the tail piece respectively.

11. A rotary valve as claimed in claim 10 , wherein

said bearing assembly comprises a bearing housing and inner and outer bearing adjustment rings each in threaded engagement with, and rotatable within, said bearing housing,

said bearing assembly further comprises a first, inner rolling bearing, a second, outer rolling bearing and a spacing ring disposed therebetween, all located between said inner and outer bearing adjustment rings,

said flange of said tail piece is axially located between said inner bearing adjustment ring and said first, inner rolling bearing, and

the flange of the tail piece is held against the first, inner rolling bearing when the rotor shaft and said tail piece are fixed to rotate together.

12. A rotary valve as claimed in claim 10 , wherein a face is formed along the rotor shaft at a point of increased diameter of the rotor shaft, and the face is held against the inner end of the tail piece when the rotor shaft and said tail piece are fixed to rotate together.

13. A rotary valve as claimed in claim 1 , wherein said removable casing end plate is coupled with a pair of rails that are slidably coupled to the main body of the casing.

14. A rotary valve for conveying fluids, powders or granular substances, said rotary valve comprising:

a rotor having a rotor shaft and vanes, and

a casing for housing the rotor within the interior of the casing, said casing comprising a removable casing end plate defining a rotor shaft aperture into which an end portion of the rotor shaft is insertable; wherein

said rotary valve comprises a rotor shaft support assembly,

said rotor shaft support assembly comprises said removable casing end plate and a bearing assembly for supporting an end portion of the rotor shaft inserted from the inner side of the removable casing end plate into the rotor shaft support assembly and through said rotor shaft aperture of the removable casing end plate,

said rotor shaft support assembly is adjustable to correct any deviation of the pitch of the rotor shaft from a level orientation relative to said removable casing end plate when the rotor shaft is supported at a single end only by the rotor shaft support assembly with the inserted end portion of the rotor shaft supported within the removable casing end plate and the bearing assembly, and

said bearing assembly comprises a bearing housing and inner and outer bearing adjustment rings each in threaded engagement with, and rotatable within, said bearing housing.