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An example valve shaft apparatus includes a shaft having a stationary seal and a dynamic seal spaced from the stationary seal. The stationary seal defines a first leakage detection area adjacent the stationary seal and the dynamic seal defines a second leakage detection area adjacent the dynamic sea

An example valve shaft apparatus includes a shaft having a stationary seal and a dynamic seal spaced from the stationary seal. The stationary seal defines a first leakage detection area adjacent the stationary seal and the dynamic seal defines a second leakage detection area adjacent the dynamic seal. A seal leakage detector is integrally formed with the shaft to provide a visual indication of process fluid leakage within the first leakage detection area or within the second leakage detection area. The seal leakage detector has a passageway in fluid communication with the first leakage detection area and the second leakage detection area. The passageway has a cross-sectional profile that changes between the first and second leakage detection areas to prevent fluid from flowing from one of the leakage detection areas into a body of the fluid valve.

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1. An apparatus for use with a fluid valve comprising: a shaft removably coupled to the fluid valve, the shaft having a stationary seal to prevent fluid leakage through a body of the fluid valve and a dynamic seal spaced from the stationary seal, the stationary seal defining a first leakage detectio

1. An apparatus for use with a fluid valve comprising: a shaft removably coupled to the fluid valve, the shaft having a stationary seal to prevent fluid leakage through a body of the fluid valve and a dynamic seal spaced from the stationary seal, the stationary seal defining a first leakage detection area adjacent the stationary seal and the dynamic seal defining a second leakage detection area adjacent the dynamic seal when the shaft is coupled to the fluid valve, the shaft further comprising a first annular groove along an outer surface of the shaft adjacent the stationary seal and in fluid communication with a first channel, and a second annular groove along the outer surface of the shaft adjacent the dynamic seal and in fluid communication with a second channel; anda passageway integrally formed with the shaft to receive a process fluid flowing through the fluid valve, the passageway having a first portion having a first cross-sectional area and a second portion having a second cross-sectional area different than the first cross-sectional area to provide a pressure differential such that the process fluid within the passageway flows toward an opening of the passageway, wherein the passageway comprises a seal leakage detector having a first channel adjacent the stationary seal that fluidly couples the first leakage detection area and the passageway and a second channel adjacent the dynamic seal that fluidly couples the second leakage detection area and the passageway. 2. An apparatus as defined in claim 1, further comprising a sampling port or an injection port in fluid communication with the process fluid flowing through the fluid valve. 3. An apparatus as defined in claim 2, wherein the sampling port or the injection port comprises a channel disposed between the stationary seal and a closure member of the fluid valve such that the channel is in fluid communication with a fluid flow path of the fluid valve, and wherein the channel fluidly couples the process fluid and a second passage, wherein the second passage is different than the passageway. 4. An apparatus as defined in claim 1, further comprising a flange integrally formed with the shaft to couple the shaft to the fluid valve. 5. An apparatus as defined in claim 4, wherein the opening of the passageway is adjacent an outer surface of the flange and in fluid communication with the atmosphere. 6. An apparatus as defined in claim 1, further comprising a pressure fitting coupled to the opening of the passageway. 7. An apparatus as defined in claim 1, wherein the first portion has a first diameter and the second portion has a second diameter smaller than the first diameter. 8. An apparatus as defined in claim 1, further comprising a bearing adjacent an end of the shaft to be disposed within a cavity of a valve closure member when the shaft is coupled to a body of the fluid valve, wherein the closure member is to rotate about the shaft during operation of the fluid valve. 9. An apparatus as defined in claim 1, wherein the passageway comprises a first path integrally formed with the shaft to fluidly couple an opening of the valve body adjacent the stationary seal to atmospheric pressure to provide an indication of process fluid leakage into the opening of the valve body adjacent the stationary seal. 10. An apparatus as defined in claim 1, wherein the passageway fluidly couples the first and second leakage detection areas to an outer surface of a flange of the shaft or an outer surface of a body of the fluid valve. 11. An apparatus as defined in claim 1, wherein the passageway is coaxially aligned with a longitudinal axis of the shaft. 12. An apparatus as defined in claim 1, wherein the second cross-sectional area is smaller than the first cross-sectional area. 13. An apparatus as defined in claim 3, wherein the second passage is parallel relative to the passageway. 14. An apparatus for use with a fluid valve comprising: a shaft removably coupled to the fluid valve, the shaft having a stationary seal to prevent fluid leakage through a valve body of the fluid valve and a dynamic seal spaced from the stationary seal; anda passageway integrally formed with the shaft to receive a process fluid flowing through the fluid valve, the passageway having a first portion having a first cross-sectional area and a second portion having a second cross-sectional area different than the first cross-sectional area to provide a pressure differential such that the process fluid within the passageway flows toward an opening of the passageway, wherein the passageway comprises a seal leakage detector, and wherein the passageway further comprises a first path integrally formed with the shaft to fluidly couple an opening of the valve body adjacent the stationary seal to the atmosphere to provide an indication of process fluid leakage into the opening of the valve body adjacent the stationary seal and a second path integrally formed with the shaft and adjacent the first path to fluidly couple a cavity of a closure member adjacent the dynamic seal to the atmosphere to provide an indication of process fluid leakage into the cavity of the closure member adjacent the dynamic seal. 15. An apparatus as defined in claim 14, wherein the first path is fluidly coupled and coaxially aligned with the second path. 16. An apparatus as defined in claim 14, further comprising a sampling port or an injection port in fluid communication with the process fluid flowing through the fluid valve. 17. An apparatus as defined in claim 16, wherein the sampling port or the injection port comprises a channel disposed between the stationary seal and the closure member of the fluid valve such that the channel is in fluid communication with a fluid flow path of the fluid valve, and wherein the channel fluidly couples the process fluid and a second passage, wherein the second passage is different than the passageway. 18. An apparatus as defined in claim 14, further comprising a flange integrally formed with the shaft to couple the shaft to the fluid valve. 19. An apparatus as defined in claim 18, wherein an opening of the passageway is adjacent an outer surface of the flange and in fluid communication with the atmosphere. 20. An apparatus as defined in claim 19, further comprising a pressure fitting coupled to an opening of the passageway. 21. An apparatus as defined in claim 14, wherein the first portion has a first diameter and the second portion has a second diameter smaller than the first diameter. 22. An apparatus as defined in claim 14, further comprising a bearing adjacent an end of the shaft to be disposed within the cavity of the closure member when the shaft is coupled to the body of the fluid valve, wherein the closure member is to rotate about the shaft during operation of the fluid valve. 23. An apparatus as defined in claim 14, wherein the passageway comprises a first annular groove along an outer surface of the shaft adjacent the stationary seal and in fluid communication with the first path, and a second annular groove along an outer surface of the shaft adjacent the dynamic seal and in fluid communication with the second path. 24. An apparatus as defined in claim 14, wherein the passageway is coaxially aligned with a longitudinal axis of the shaft. 25. An apparatus as defined in claim 14, wherein the second cross-sectional area is smaller than the first cross-sectional area.