| http://www.w3.org/ns/prov#value | - A preferred embodiment of shut-off valve has a valve means which is free to roll with gravity, such as a cylinder or ball, which can roll freely along an inclined guide, chute or support, into a position at the valve seat closing off the valve passage when the container is in any position between a few degrees less than horizontal to fully inverted, i.e., from -2??? to -90??? below the horizontal,
|
