Valve with unobstructed flow path having increased flow coefficient

1. A valve comprising:

a valve body including:

a first end and a second end spaced apart along a longitudinal axis, and

a central portion disposed between the first end and the second end, wherein the first end and the second end define a first flow passageway and a second flow passageway, respectively, and wherein the central portion defines an interior chamber;

a stem rotatably supported by the valve body about a rotation axis, wherein the stem includes a polygonal end; and

a disc disposed within the interior chamber and including an asymmetrical polygonal aperture to receive the polygonal end of the stem,

wherein the first flow passageway, the second flow passageway, and the interior chamber are completely unobstructed between the first end and the second end of the valve body, in such a way that a radial dimension in all cross sections is no less than nominal pipe size of a connecting pipe at the first end of the first flow passageway and the second end of the second flow passageway.

2. The valve of claim 1 , wherein the asymmetrical polygonal aperture of the disc and the polygonal end of the stem include matching polygonal shapes to assist with installation of the stem to the disc and to provide increased torque transmission from the stem to the disc.

3. The valve of claim 1 , wherein the first flow passageway and the second flow passageway are coaxial.

4. The valve of claim 3 , wherein the first flow passageway and the second flow passageway have respective first and second cross-sectional areas defined orthogonal to the longitudinal axis, wherein the first cross-sectional area is equivalent to the second cross-sectional area.

5. The valve of claim 1 , wherein the disc defines a central plane offset from the rotation axis.

6. The valve of claim 5 , wherein a centerline axis of the disc orthogonal to the central plane is offset from the rotation axis.

7. The valve of claim 6 , wherein the valve body defines a valve seat engaged by the disc when the disc is in a closed position, wherein a first portion of the valve seat is non-parallel to a second portion of the valve seat.

8. The valve of claim 1 , wherein the disc is rotatable within the interior chamber between a closed position, wherein the disc closes one of the first flow passageway or the second flow passageway, and an open position, wherein at least one of the first flow passageway and the second flow passageway is completely unobstructed between the first end and the second end of the valve body when projected along the longitudinal axis.

9. The valve of claim 8 , wherein the stem includes a first stem portion supported by the valve body and coupled to a top of the disc, and a second stem portion supported by the valve body and coupled to a bottom of the disc, wherein the first and second stem portions are spaced apart on opposite sides of, and do not project into, the at least one of the first flow passageway and the second flow passageway projected along the longitudinal axis.

10. The valve of claim 9 , wherein the disc includes first and second arms extending from the top and the bottom of the disc respectively, each of the first and second arms including a hub coupled to one of the first and second stem portions.

11. The valve of claim 10 , wherein the first and second stem portions include a first and second polygonal end, respectively, and the hub of each of the first and second arms includes a first and second polygonal aperture, respectively.

12. The valve of claim 10 , wherein one of the first and second stem portions include the polygonal end.

13. The valve of claim 12 , wherein the hub of one of the first and second arms includes the asymmetrical polygonal aperture.

14. The valve of claim 1 , wherein the first end of the valve body includes a bore, and further comprising a seat ring disposed in the bore and defining at least in part the first flow passageway.

15. The valve of claim 14 , further comprising a locator interfacing between the seat ring and the valve body.

16. The valve of claim 14 , further comprising a retainer ring securing the seat ring to the valve body.

17. The valve of claim 16 , further comprising a sealing component disposed between the seat ring and the retainer ring.

18. The valve of claim 14 , wherein the seat ring includes a concave sealing surface, and wherein the disc engages the concave sealing surface when rotated to a closed position.

19. The valve of claim 18 , wherein the disc includes a seal guide operable to receive a seal ring, wherein the seal ring contacts the concave sealing surface of the seat ring when the disc engages the concave sealing surface of the seat ring.

20. The valve of claim 19 , wherein the seal ring is held between the seal guide and a seal retainer coupled to the disc.