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A system includes a ball valve with a housing having a fluid passage, a ball disposed within the housing along the fluid passage, and a stem coupled to the ball. The stem is configured to move the ball between an open position and a closed position relative to the fluid passage. The stem is disposed

A system includes a ball valve with a housing having a fluid passage, a ball disposed within the housing along the fluid passage, and a stem coupled to the ball. The stem is configured to move the ball between an open position and a closed position relative to the fluid passage. The stem is disposed in a first opening on a first side of the housing. The stem is removable from the first opening, through at least one opening in the ball, and out through a second opening on a second side of the housing.

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1. A system, comprising: a valve assembly, comprising: a valve body having a fluid passage, a fluid chamber along the fluid passage, and a stem bore extending crosswise to the fluid passage through a first side of the valve body into the fluid chamber;a valve disposed in the fluid chamber; anda valv

1. A system, comprising: a valve assembly, comprising: a valve body having a fluid passage, a fluid chamber along the fluid passage, and a stem bore extending crosswise to the fluid passage through a first side of the valve body into the fluid chamber;a valve disposed in the fluid chamber; anda valve stem disposed in the stem bore on the first side of the valve body and coupled to the valve, wherein the valve stem is internally retained within the valve body via at least one internal retainer, at least one removable retainer is disposed between an outer surface of the valve stem and an inner surface of the valve assembly to block inward movement of the valve stem along an axis of the stem bore, the valve assembly is configured to enable removal of the valve stem from the valve body via release of the at least one internal retainer and movement of the valve stem along an internal path through valve body while the valve remains disposed in the fluid chamber, and the valve stem is configured to be removed along the internal path in an inward direction through the stem bore in the first side of the valve body toward the fluid chamber followed by an outward direction through the stem bore in a second side of the valve body. 2. The system of claim 1, wherein the at least one internal retainer comprises a first internal retainer that blocks movement of the valve stem along an axis of the stem bore, and a second internal retainer that blocks movement of the valve stem along the axis of the stem bore. 3. The system of claim 2, wherein the first and second internal retainers are offset from one another along the axis of the stem bore, and each of the first and second internal retainer blocks movement of the valve stem in an outward radial direction along the axis of the stem bore. 4. The system of claim 2, wherein the first internal retainer blocks movement between the valve stem and the valve body, and the second internal retainer blocks movement between the valve stem and the valve. 5. The system of claim 2, wherein the first internal retainer comprises a first annular abutment facing outwardly away from the fluid chamber in the valve body, and the second internal retainer comprises a second annular abutment facing outwardly away from the fluid chamber in the valve body. 6. The system of claim 5, wherein the first internal retainer comprises a bushing adjacent the first annular abutment between the valve stem and the valve body, and the second internal retainer comprises a seal adjacent the second annular abutment between the valve stem and the valve. 7. The system of claim 6, wherein the second annular abutment comprises an annular flange having the seal disposed about an outer circumference of the annular flange. 8. The system of claim 6, comprising another seal disposed between the valve stem and the valve body. 9. The system of claim 1, wherein the at least one internal retainer comprises first and second protrusions in the valve stem extending away from an axis of the valve stem, the first protrusion extends to a first radius and blocks axial movement of the valve stem relative to a first internal shoulder, the second protrusion extends to a second radius and blocks axial movement of the valve stem relative to a second internal shoulder, and the first and second radii are different from one another. 10. The system of claim 1, wherein the at least one removable retainer comprises a split ring. 11. The system of claim 1, wherein the at least one removable retainer comprises a first c-shaped portion and a second c-shaped portion. 12. The system of claim 1, wherein the at least one removable retainer is disposed between the outer surface of the valve stem and the inner surface of the stem bore in the valve body. 13. The system of claim 1, wherein the at least one removable retainer is disposed between the valve body and an adapter removably coupled to the valve body. 14. The system of claim 1, wherein the valve stem is internally retained within the valve body without any threaded fasteners. 15. The system of claim 1, wherein the valve body blocks blowout of the valve stem through the stem bore. 16. The system of claim 1, wherein the valve stem is not removable in an outward direction away from the fluid chamber through the stem bore in the first side of the valve body. 17. The system of claim 1, wherein the valve assembly has an axial path configured to enable installation and removal of the valve stem relative to the valve body only via axial movement along the axis of the stem bore and the axial path while the valve remains disposed in the valve body. 18. The system of claim 1, wherein the valve stem is removable through the fluid passage. 19. The system of claim 1, wherein the valve stem is removable through an opening different from the fluid passage and the stem bore. 20. The system of claim 1, wherein the at least one internal retainer is not externally accessible and removable through the stem bore on the first side of the valve body. 21. The system of claim 1, wherein the valve stem is configured to be installed and removed from the valve body only via axial movement along an axis of the stem bore. 22. The system of claim 1, wherein the valve comprises a ball valve. 23. A system, comprising: a valve assembly, comprising: a valve body;a valve disposed in the valve body; anda valve stem coupled to the valve, wherein the valve stem is internally retained within the valve body via at least one internal retainer within the valve body, the valve assembly is configured to enable removal of the valve stem from the valve body via release of the at least one internal retainer and inward movement of the valve stem along an internal path into the valve body while the valve remains disposed in the valve body, and the valve assembly has an axial path configured to enable installation and removal of the valve stem relative to the valve body only via axial movement along an axis of the stem bore and the axial path while the valve remains disposed in the valve body. 24. The system of claim 23, wherein the valve stem is removable through an opening different from the stem bore and a fluid passage through valve body. 25. The system of claim 23, wherein the valve stem is disposed in a first bore in a first side of the valve body, and the valve stem is removable at least in an inward direction through the first bore into the valve body after the at least one internal retainer is internally accessed inside the valve assembly to release the valve stem while the valve remains disposed in the valve body. 26. A method, comprising: internally retaining a valve stem coupled to a valve in a fluid chamber within a valve body of a valve assembly with at least one removable retainer within the valve body; andenabling removal of the valve stem from the valve body via release of the at least one removable retainer and movement of the valve stem along an internal path through the valve body while the valve remains disposed in the valve body, wherein the internal path of removal of the valve stem comprises an inward direction through a stem bore in a first side of the valve body toward the fluid chamber followed by an outward direction through the stem bore in a second side of the valve body. 27. The method of claim 26, wherein internally retaining comprises internally retaining the valve stem within the valve body with the at least one removable retainer and first and second protrusions extending away from an axis of the valve stem, wherein the at least one removable retainer is disposed between an outer surface of the valve stem and an inner surface of the valve assembly to block inward movement of the valve stem, the first protrusion blocks axial movement of the valve stem relative to a first internal shoulder in the valve body, the second protrusion blocks axial movement of the valve stem relative to a second internal shoulder in the valve, wherein internally retaining comprises preventing removal of the valve stem in an outward radial direction from a first bore in a first side of the valve body, wherein the valve stem is disposed in the first bore. 28. The method of claim 27, wherein the first protrusion blocks axial movement of the valve stem in an outward radial direction relative to the first internal shoulder in the valve body, and the second protrusion blocks axial movement of the valve stem in the same outward radial direction relative to the second internal shoulder in the valve. 29. The method of claim 27, wherein the first protrusion extends away from the axis of the valve stem to a first radius, the second protrusion extends away from the axis of the valve stem to a second radius, and the first and second radii are different from one another. 30. The method of claim 29, wherein the first radius is less than the second radius. 31. The method of claim 27, wherein the first protrusion comprises a first axial abutment facing outwardly away from a valve chamber in the valve body, the second protrusion comprises a second axial abutment facing outwardly away from the valve chamber in the valve body, and the valve is disposed in the valve chamber. 32. The method of claim 26, wherein the valve assembly has an axial path configured to enable installation and removal of the valve stem relative to the valve body only via axial movement along an axis of the stem bore and the axial path while the valve remains disposed in the valve body.