Abstract: The specification discloses an isolation gate valve (10) for controlling flow of a particulate type material of a dry or semi dry nature including ore and coal, the gate valve (10) having a support frame (11), at least one slidable blade member (20, 21) movably mounted relative to said support frame (11) to selectably open or close a material flow opening (12) defined by said support frame (11), one or more actuators (22, 23) provided to drive the slidable blade member or members (20, 21) between open or closed positions, the or each said slidable blade member (20, 21) having a forward leading edge region (27, 28) adapted, in use, to transversely extend across the material flow opening (12).

Abstract: A flow control device 7A for use with apparatus 1 for discharging granular material from storage, which has an inlet adapted to receive granular material from the storage, a containment chute 7 for receiving material from the inlet and for discharging the material through a discharge opening to a conveyor system 13, includes a pivotally mounted segment gate 11 adapted to move in an arcuate manner across the discharge opening 8 of the containment chute 7 to vary the cross-sectional area of the discharge opening 8 and an actuator 12 for moving or positioning the segment gate.