Flow control apparatus for carrier fluid

A tubular conveyance system comprising:

• a pressure sensor configured to measure a pressure within a conveyance tube;
• a blower configured to accelerate a carrier fluid into the conveyance tube,
• wherein the blower has a blowing direction which defines an upstream position and a downstream position relative to the blower;
• a material feeder configured to add a conveyance material to the conveyance tube to be conveyed by the carrier fluid,
• wherein the material feed is disposed in the downstream position relative to the blower;
• and
• a flow control apparatus configured to control an amount of carrier fluid provided to the blower,
• wherein the flow control apparatus is disposed in the upstream position relative to the blower,
• wherein the flow control apparatus includes
• a mobile plate having a mobile plate opening therein, and
• a drive mechanism configured to selectively place the mobile plate into an open position and a closed position,
• wherein the open position is defined as at least a portion of the mobile plate opening being aligned so as to allow carrier fluid to flow therethrough.