Patent ID: 7121296
Filing Date: 2006-10-17
Classification: F16K,F23K,G05D,Y10T

Abstract:
1. A valve for controlling the flow of particulate coal cried by an air stream moving along the axis of a conduit of known cross-sectional area comprising: an insert of tapered cylindrical shape having an entry end adapted to be co-axially connected to said conduit, having a cross-sectional area at said entry end substantially equal to that of the conduit and having a mid-section of a diameter and cross-sectional area which is substantially greater than that of the entry end; a valve element of tapered shape and of a maximum diameter which is smaller than that of said conduit and said entry end mounted in the insert for movement along said axis between a first unseated position wherein the cross-sectional area between the maximum diameter of said element and the mid-section of said insert is approximately equal to the cross-sectional area of said conduit and a second unseated position wherein the area between the maximum diameter of said element and corresponding diameter of said insert is substantially less tan the cross-sectional area of said conduit; and a mechanical system connected between the conduit and element for effecting axial movement of said element between said first and second position.