... a steel frame complete with a material discharge hopper, hoist, iris valve and an upper mobile cross bar for lifting of ... and 25 ft(7.62 m) of load cell cable. iris valveRELIABLE VALVE TO CONTROL THE GRAVITY DISCHARGE OF FREE-FLOWING ... Conveyor, Bag filling system, Dump dumper, Iris valve, Fluidizer, rotary valve, slide valve, diverting valve, iris valve, conveyors, vibra conveyor, screw conveyor ...