Patent ID: 6170521
Filing Date: 2001-01-09
Classification: F16L,Y10T

Abstract:
A shut-off arrangement comprising a first shut-off device and a particulate conveyed material comprising conveyed material particles that are adapted to be conveyed in a flow of a conveying fluid selectively through said first shut-off device, said first shut-off device comprising:a housing having a flow passage therethrough; andat least one shut-off element movably arranged in said housing so as to be selectively movable between a first maximum open position in which said at least one shut-off element leaves said flow passage substantially open to allow said particulate conveyed material to flow therethrough, and a second maximum closed position in which said at least one shut-off element mostly, but not completely, closes said flow passage while leaving an open gap therethrough, wherein said open gap is so configured and dimensioned such that said conveyed material particles become caught in said open gap or on an edge of said at least one shut-off element bounding said gap and thereby close said open gap and prevent said particulate conveyed material from further flowing therethrough when said at least one shut-off element is in said second maximum closed position.