CPC B65G 53/66 (2013.01) [B65G 53/06 (2013.01); B65G 53/58 (2013.01)] | 18 Claims |
1. A fluid control system in a pneumatic conveying duct for powdered or granular material, comprising:
a conveying duct inside which the powdered or granular material is conveyed;
a plurality of supply sources of respective pressurized gases for transporting said powdered or granular material inside said conveying duct;
a plurality of injection lines of said gases to respectively put the supply sources in fluid communication with said conveying duct;
a plurality of self-regulating pressure valves arranged respectively on the injection lines between the respective supply sources and said conveying duct;
a plurality of control members respectively operatively connected to the self-regulating pressure valves to respectively provide command signals, representing pressure values, to the self-regulating pressure valves, each of the self-regulating pressure valves maintaining constant gas flow values supplied in said conveying duct;
a plurality of flow and flow rate meters, respectively arranged on the injection lines upstream of the self-regulating pressure valves to transmit a-flow and flow rate values to the control members;
a plurality of pressure meters arranged respectively on the injection lines downstream of the self-regulating pressure valves and close to the conveying duct to respectively transmit pressure values to the control members,
the control members determining pressure and/or flow parameters regulated by the respective self-regulating pressure valves depending on pressure values detected by the pressure meters.
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