Patent ID: 9103453
Filing Date: 2015-08-11
Classification: F16K,Y10T

Abstract:
1. A valve shaft apparatus for use with a rotary valve comprising: a shaft having a first portion to be positioned in an opening of a valve body and a second portion to be in a cavity of a closure member; a first seal coupled to the first portion of the shaft to prevent fluid leakage into the opening of the valve body, the first seal to define a first leakage detection area adjacent the first seal; a second seal coupled to the second portion to prevent fluid leakage into the cavity of the closure member, the first seal spaced from the second seal, the second seal to define a second leakage detection area adjacent the second seal; and a passageway formed in the shaft and fluidly coupled to the first and second leakage detection areas to provide an indication of fluid leakage past the first seal in the opening or to detect fluid leakage past the second seal in the cavity, the passageway being in fluid communication with a shaft outlet formed in an end of the shaft, the shaft outlet positioned away from the first and second leakage detection areas.