| 摘要 |
Conveyor gas is drawn from a material conveyor conduit, upstream of the introduction of material into the conveyor gas flow, and passed through a by-pass conduit. The by-pass conduit is connected to the conveyor conduit at spaced positions along the length thereof, and non-return valves are provided at each of the connections and are closed in normal conveying operation. If material begins to accumulate in the conveyor conduit, resulting in the pressure in the conveyor conduit downstream of the accumulation decreasing by more than a given amount below the pressure in the by-pass conduit, a valve downstream of the beginning of the accumulation is opened to direct gas from the by-pass into the conveyor conduit, to break up the accumulation. The valves can also close the by-pass conduit at the same time as they produce the gas transfer into the conveyor conduit. |
