Patent ID: 8479767

Claim:
A combined fill and safety vent plug adapted to being mounted in a port in a pressure tank, said combined fill and safety vent plug comprising: a valve housing member having a longitudinal axis extending there through between a normally exterior end and a normally interior end of said valve housing member, said normally exterior end being located on a normally exterior portion of said valve housing member, and said normally interior end of said valve housing member being located on a normally interior portion of said valve housing member; a vent valve socket extending parallel to said longitudinal axis within said valve housing member and adapted to being in fluid venting communication between an interior of said pressure tank and at least a generally laterally extending pressure relief port in said normally exterior portion; a fill valve socket extending axially within said valve housing member and adapted to being in fluid filling communication through said port with said interior of said pressure tank; an overflow channel extending within said valve housing member and adapted to being in fluid overflow communication between said interior of said pressure tank and an overflow port in said normally exterior portion; a vent valve mounted in said vent valve socket, said vent valve being spring biased towards a closed configuration and adapted to being moved to a pressure venting configuration responsive to a predetermined amount of fluid pressure in said interior of said pressure tank; a fill valve mounted in said fill valve socket, said fill valve being biased towards a closed configuration and adapted to being moved to a filling configuration by contact with a fill nozzle; and a dip tube mounted in fluid communication with said overflow channel, said overflow port adapted to being open during a filling operation and otherwise normally closed; wherein opening said overflow port does not require said spring bias to be overcome.