Flush valve assembly

1. A flush valve assembly, comprising

a flush valve body comprising an inner surface, an outer surface, a flush valve inlet, a flush valve outlet, and an opening for receiving a flush valve lever assembly; and

a central seating body part comprising an outer surface and a bore configured to accommodate a valve,

wherein

the central seating body part outer surface is permanently connected to the flush valve body inner surface.

2. The flush valve assembly of claim 1 , comprising a flush valve lever assembly comprising an actuator pin guide and a bonnet nut.

3. The flush valve assembly of claim 2 , wherein the bonnet nut comprises an interior threaded surface and an exterior threaded surface and is configured to threadingly engage the opening of the flush valve body and the actuator pin guide.

4. The flush valve assembly of claim 3 , wherein the actuator pin guide comprises an exterior threaded surface for engaging the interior threaded surface of the bonnet nut, and wherein the opening of the flush valve body comprises an interior threaded surface for engaging the exterior threaded surface of the bonnet nut.

5. The flush valve assembly of claim 2 , wherein the flush valve lever assembly comprises a seal between the actuator pin guide and the opening of the flush valve body.

6. The flush valve assembly of claim 1 , wherein the flush valve body comprises an inner threaded surface for mating engagement with an outer threaded surface of the central seating body part.

7. The flush valve assembly of claim 1 , wherein the central seating body part comprises splines for engaging a mounting key.

8. The flush valve assembly of claim 1 , wherein the flush valve body comprises an extension having an inner threaded surface, and wherein the extension protrudes longitudinally toward the outlet of the flush valve body.

9. The flush valve assembly of claim 8 , wherein the extension is substantially cylindrical.

10. The flush valve assembly of claim 1 , wherein the central seating body part comprises a smooth portion configured to receive an O-ring.

11. The flush valve assembly of claim 1 , wherein the central seating body part is configured to be threaded into the flush valve body, and wherein adhesive is provided on the central seating body part such that the central seating body part and the flush valve body are permanently connected.

12. The flush valve assembly of claim 1 , wherein the flush valve body includes a shoulder, and wherein the central seating body part has a flange adjacent the shoulder.

13. The flush valve of claim 1 , comprising an O-ring between the flush valve body and the central seating body part.

14. The flush valve assembly of claim 1 , wherein the flush valve body comprises brass and the central seating body part comprises plastic.

15. A bonnet nut for a flush valve lever assembly, the bonnet nut comprising

a substantially tubular body having a first end and a second end;

a first threaded surface at the second end for coupling to a flush valve body; and a second threaded surface at the second end for coupling to an actuator pin guide,

wherein

the first threaded surface is an outer threaded surface and the second threaded surface is an inner threaded surface, and

the bonnet nut comprises a flange configured to engage a surface of a flush valve body.

16. The bonnet nut of claim 15 , wherein the first end further comprises a rounded portion configured to receive a radial bearing.

17. The bonnet nut of claim 15 , wherein the bonnet nut comprises brass and the actuator pin guide comprises a thermoplastic.