1. A valve, comprising: a body having a first end, a second end opposite the first end, and a throughbore extending from the first end to the second end along a central axis; a valve element positioned within the throughbore for selectably isolating fluid flow through the throughbore; a seal end cap including a flange and a neck, wherein the neck is inserted into the throughbore from the second end of the body to engage with the valve element; and a hub end cap including a mounting flange engaged with the flange of the seal end cap; wherein the flange of the seal end cap is engaged with the second end of the body whereby the flange of the seal end cap is compressed between the second end of the body and the mounting flange of the hub end cap.

2. The valve of claim 1 , further comprising a plurality of fasteners that extend through the flange of the seal end cap and terminate in the body to compress the seal end cap against the second end of the body.

3. The valve of claim 2, wherein the plurality of fasteners each comprise a threaded stud that is threadably engaged within the body.

4. The valve of claim 2, wherein the plurality of fasteners each extend between a first end that terminates in the body and a second end that terminates in the seal end cap such that the second end of the fastener does not project axially from the seal end cap.

5. The valve of claim 1 , further comprising: a first plurality of fasteners that extend through the mounting flange of the hub end cap and terminate within the flange of the seal end cap; and a second plurality of fasteners that extend through the flange of the seal end cap, and terminate in the body.

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AMENDED SHEET (ARTICLE 19)

6. The valve of claim 5, wherein the first plurality of fasteners are circumferentially interleaved with the second plurality of fasteners about the central axis.

7. The valve of claim 2, comprising: an upstream valve seat positioned within the throughbore; and a downstream valve seat formed on the neck of the seal end cap, wherein the upstream valve seat is positioned between the valve element and the first end of the body, wherein the upstream valve seat includes a seating surface that is engaged with the valve element; and wherein the downstream valve seat includes a seating surface that is engaged with the valve element.

8. The valve of claim 1 , wherein: the hub end cap comprises a first hub end cap of the valve; and the valve further comprises a second hub end cap including a mounting flange engaged with the second end of the body.

9. A fluid conduit system, comprising: the valve of claim 8; a first fluid conduit welded to the first hub end cap; and a second fluid conduit welded to the second hub end cap, and wherein the seal end cap and the body of the valve are each releasably coupled to both the first fluid conduit and the second fluid conduit.

10. A valve, comprising: a body having a first end, a second end opposite the first end, and a throughbore extending from the first end to the second end along a central axis; a valve element positioned within the throughbore; a seal end cap including a flange and a neck, wherein the neck is inserted into the throughbore from the second end of the body to engage with the valve element;

AMENDED SHEET (ARTICLE 19) a hub end cap including a mounting flange and an annular mounting surface that defines an end of the hub end cap, wherein the mounting surface is configured to be welded to a first pipe, and wherein the mounting flange of the hub end cap is engaged with the flange of the seal end cap; and a first plurality of fasteners that extend through the hub end cap and the flange of the seal end cap, and terminate in the body, the first plurality of fasteners configured to releasably couple the body to the first pipe.

11. The valve of claim 10, further comprising a second plurality of fasteners that extend through the flange of the seal end cap and terminate within the body to releasably couple the seal end cap to the body.

12. The valve of claim 11, wherein the first plurality of fasteners are circumferentially interleaved with the second plurality of fasteners about the central axis.

13. The valve of claim 11, wherein the second plurality of fasteners terminate in the seal end cap such that the second plurality of fasteners do not project axially into the hub end cap.

14. The valve of claim 11 , wherein the first plurality of fasteners each comprise a threaded stud that is threadably engaged within the body.

15. The valve of claim 11 , wherein the second plurality of fasteners each comprise a threaded screw that is threadably engaged within the body.

16. A method for removing a valve from a fluid conduit system, the method comprising:

(a) withdrawing a first plurality of fasteners from a hub end cap of the valve, the first plurality of fasteners releasably coupling a body of the valve to a first fluid conduit of the fluid conduit system, wherein a valve element is positioned within a throughbore of the body for selectably isolating fluid flow through the throughbore;

(b) transporting the body and a seal end cap of the valve releasably coupled to the body in a direction orthogonal to a central axis of the first fluid

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AMENDED SHEET (ARTICLE 19) conduit following the withdrawal of the first plurality of fasteners, wherein the seal end cap comprises a neck received in the throughbore of the body to engage with the valve element; and

(c) withdrawing the neck of the seal end cap from the throughbore of the body after (a) and (b).

17. The method of claim 16, wherein (a) comprises unthreading the first plurality of fasteners from a plurality of mounting bores formed in the body.

18. The method of claim 16, further comprising:

(d) maintaining a welded connection between the first fluid conduit and the hub end cap of the valve during (b).

19. The method of claim 16, further comprising:

(d) withdrawing a second plurality of fasteners from another hub end cap of the valve, the second plurality of fasteners releasably coupling a second fluid conduit of the fluid conduit system to the body of the valve.

20. The method of claim 19, further comprising:

(e) maintaining a welded connection between the second fluid conduit and the another hub end cap of the valve during (d).

21. The method of claim 19, wherein (d) comprises unthreading the second plurality of fasteners from another plurality of mounting bores formed in the body.

AMENDED SHEET (ARTICLE 19)