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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 ball valve, comprising: a housing having a fluid passage extending along a longitudinal axis, a first opening extending crosswise to the longitudinal axis on a first side of the housing, and a second opening extending crosswise to the longitudinal axis on a second side of t

1. A system comprising: a ball valve, comprising: a housing having a fluid passage extending along a longitudinal axis, a first opening extending crosswise to the longitudinal axis on a first side of the housing, and a second opening extending crosswise to the longitudinal axis on a second side of the housing, wherein the fluid passage is disposed between the first and second sides having the respective first and second openings;a ball disposed within the housing along the fluid passage; anda stem coupled to the ball, wherein 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 the first opening on the first side of the housing, and the stem is removable from the first opening, through at least one opening in the ball, and out through the second opening on the second side of the housing. 2. The system of claim 1, wherein at least one radial abutment blocks removal of the stem through the first opening out of the first side of the housing. 3. The system of claim 2, wherein the at least one radial abutment comprises a first radial abutment on the stem and a second radial abutment in the first opening, and the first and second radial abutments block movement of the stem in a radial direction relative to the longitudinal axis of the fluid passage. 4. The system of claim 3, wherein the first radial abutment comprises a first annular shoulder, and the second radial abutment comprises a second annular shoulder. 5. The system of claim 1, comprising a retainer between the stem and the housing, wherein the retainer blocks movement of the stem in an inward radial direction toward the fluid passage. 6. The system of claim 5, wherein the retainer comprises a C-shaped retainer disposed in a first groove in the stem and a second groove in the housing. 7. The system of claim 1, comprising a trunnion disposed in the second opening in the housing, wherein the trunnion extends into an opening in the ball. 8. The system of claim 7, comprising a trunnion plate disposed over the trunnion, wherein the trunnion plate is coupled to the housing with at least one fastener. 9. The system of claim 7, comprising a bearing disposed between the trunnion and the opening in the ball. 10. The system of claim 1, comprising a thrust bearing, a thrust washer, or a combination thereof, disposed between the stem and the first opening. 11. The system of claim 1, comprising at least one dowel disposed in a first recess in the stem and a second recess in a first opening in the ball, wherein the dowel rotationally secures the stem to the ball. 12. The system of claim 11, comprising a trunnion disposed in a second opening in the ball, wherein a bearing is disposed between the trunnion and the second opening. 13. A system comprising: a valve, comprising: a housing having a fluid passage extending along a longitudinal axis, a first opening extending crosswise to the longitudinal axis on a first side of the housing, and a second opening extending crosswise to the longitudinal axis on a second side of the housing, wherein the fluid passage is disposed between the first and second sides having the respective first and second openings;a valve member disposed within the housing along the fluid passage; anda stem coupled to the valve member, wherein the stem is configured to move the valve member between an open position and a closed position relative to the fluid passage, the stem is disposed in the first opening on the first side of the housing, and the stem is removable from the first opening, through the fluid passage, and out through the second opening on the second side of the housing. 14. The system of claim 13, wherein the stem is removable from the first opening, through at least one opening in the valve member, and out through the second opening on the second side of the housing. 15. The system of claim 13, wherein the valve member comprises a ball. 16. The system of claim 13, wherein at least one radial abutment blocks removal of the stem through the first opening out of the first side of the housing. 17. The system of claim 16, wherein the at least one radial abutment comprises a first annular shoulder on the stem and a second annular shoulder in the first opening, and the first and second annular shoulders block movement of the stem in a radial direction relative to the longitudinal axis of the fluid passage. 18. The system of claim 13, comprising a retainer between the stem and the housing, wherein the retainer blocks movement of the stem in an inward radial direction toward the fluid passage. 19. A method, comprising: removing a valve stem through a first opening extending crosswise to an axis on a first side of a housing of a valve, through at least one opening in a ball disposed along a fluid passage extending along the axis inside the housing of the valve, and out through a second opening extending crosswise to the axis on a second side of the housing of the valve, wherein the fluid passage is disposed between the first and second sides having the respective first and second openings. 20. The method of claim 19, wherein removing the valve stem comprises: removing a stop plate disposed over a retainer;removing the retainer from the valve stem to release the valve stem from the housing;removing a trunnion from the ball and the second opening of the housing; andmoving the valve stem in a radial direction through the at least one opening in the ball, and out through the second opening. 21. The system of claim 1, wherein the stem has a stem length greater than a length of the first opening through the housing. 22. The system of claim 1, wherein the stem has a length that is equal to or lesser than a diameter of a bore through the ball. 23. The system of claim 1, wherein the stem has a length that is greater than a diameter of a bore through the ball. 24. The system of claim 1, comprising a seal disposed in a recess between the stem and the first opening in the housing. 25. The system of claim 1, comprising a seal disposed in a recess between the stem and the at least one opening in the ball. 26. The system of claim 1, wherein the stem has a first portion that interfaces with and rotatably couples with the ball and a second portion that interfaces with and rotatably moves within the first opening.