US 11,891,255 B2
Fluid control system in pneumatic conveying ducts for powdered or granular material
Massimo Congedi, Gorgonzola (IT); Per Magnus Westby, Gorgonzola (IT); and Fabio Novelli, Gorgonzola (IT)
Assigned to NTE HOLDING S.R.L., Gorgonzola (IT)
Appl. No. 17/916,913
Filed by NTE HOLDING S.R.L., Gorgonzola (IT)
PCT Filed May 25, 2020, PCT No. PCT/IT2020/000040
§ 371(c)(1), (2) Date Oct. 4, 2022,
PCT Pub. No. WO2021/240554, PCT Pub. Date Dec. 2, 2021.
Prior Publication US 2023/0150778 A1, May 18, 2023
Int. Cl. B65G 53/66 (2006.01); B65G 53/06 (2006.01); B65G 53/58 (2006.01)
CPC B65G 53/66 (2013.01) [B65G 53/06 (2013.01); B65G 53/58 (2013.01)] 18 Claims
OG exemplary drawing
 
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.