US Patent 7721759 Valve having a protective cage

A valve for a liner bag includes a valve seat having an opening extending therethrough to be aligned with an opening in the liner bag, and a flange extends outwardly from the valve seat and is to be placed inside the liner bag so that the valve seat projects outside the liner bag. A valve member is within the opening of the valve seat for controlling egress of liquids or flowable solids from the liner bag. An operating lever is outside the liner bag for operating the valve member. A fixed protective cage is coupled to the flange for protecting the opening of the valve seat from inside the liner bag when the liner bag collapses.