Patent ID: 8662099

Claim:
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; and a 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.