Patent ID: 8636023

Claim:
A fire suppression wet pipe system air vent assembly, comprising: a primary air vent valve having an inlet and an outlet, said primary air vent valve inlet adapted to be connected with a fire suppression wet pipe system, said primary air vent valve configured to vent air but not water from its outlet; a secondary air vent valve having an inlet and an outlet, said secondary air vent valve configured to vent air but not water from its outlet; a fluid conduit connecting said primary air vent valve outlet with said secondary air vent valve inlet; and a fluid indicator that indicates the presence of fluid in said conduit, wherein said secondary air vent valve provides failsafe air venting upon the failure of said primary air vent valve and wherein said fluid indicator indicates failure of said primary air vent valve, wherein said fluid indicator comprises a visual indicator that is visible from below said fluid conduit, wherein said visual indicator comprises a sight glass at a bottom portion of said conduit and an indicator element in said conduit that floats away from said sight glass in the presence of fluid in said conduit.