Patent ID: 6571562
Filing Date: 2003-06-03
Classification: F01M,F16K

Abstract:
A witness drain valve for an engine, said witness drain valve being disposed in a drain line between a seal cavity and a collector tank comprising:a flow channel with variable diameters along an axial direction having an upstream end and a downstream end at opposite sides in said axial direction; a first interface means at said upstream end to connect to an upstream drain line having an up stream flow center line; a second interface means at said downstream end to connect to a downstream drain line having a downstream flow center line; a cavity serving as a fluid reservoir formed within said flow channel by said variable diameters in said axial direction wherein said cavity having a predetermined volume inside said witness drain valve and a bottom end away from said upstream flow center lines; said predetermined volume of said cavity being substantially below said upstream flow centerline or said down stream flow center line whichever is further; an opening at said bottom end of said cavity; and, a commercially available finger push valve inserted into said cavity through said opening.