The Sterling Systems & Controls bulk bag unloading system with integral dust containment provides operator access to the bag spout for connecting a new full bag or disconnecting an empty bag within a dust containment box. A positive shutoff valve to turn flow from the bag on and off as needed is provided. This iris-type valve allows the operator to connect a new full bag and untie its spout without an immediate flow of material from the bulk bag.
When the operator is ready and a new bag is connected, the operator slowly opens the valve manually until it is fully open. The same process is performed in reverse when the bag is empty. Significant dust can be present when the bag is empty if the operator does not account for residual material left in the bag. If the spout is left open, dust can easily escape during removal or when compressed for disposal or recycling.