High volume pneumatic tank

Claim 1

In a high volume pneumatic tank, vertical, cylindrical walls and concave-convex heads mounted on each end of said walls, horizontally and vertically inclined slope sheets mounted adjacent the head forming the bottom of the tank, an air slide mounted between the slope sheets and pourous slide plates mounted on said slides, a load inlet line and a load discharge line mounted in said tank, said discharge line extending from a point adjacent said slide plates to the point of ultimate discharge, an air inlet line beneath said slope sheets and pressure equalizing means for equalizing the pressure in the tank on each side of said slope sheets consisting of two conduits extending from beneath the slope sheets to a point above the content level inside the tank, one of said conduits permitting pressure flow in one direction and the other conduit permitting pressure flow in the opposite direction, said equalizing means has a filter to prevent pulverulent material from moving from one side of said slope sheets to the other, and means for maintaining a preselected pressure differential beneath said slope sheets.