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1. (WO2018222385) POWDER FEED CONTROL SYSTEM AND METHOD

Pub. No.:    WO/2018/222385    International Application No.:    PCT/US2018/032704
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Wed May 16 01:59:59 CEST 2018
IPC: B05B 12/08
Applicants: OERLIKON METCO (US) INC.
Inventors: SPAULDING, Mark Frank
ARJONA, Daniel R.
Title: POWDER FEED CONTROL SYSTEM AND METHOD
Abstract:
Powder feed rate control system that includes a hopper adapted to contain a powder and to maintain a hopper pressure. A carrier conduit delivers a carrier gas flow and having an orifice. The carrier gas flow conveys powder entering through the orifice at a powder feed rate. A differential pressure transducer includes a first pressure input associated with the hopper pressure and a second pressure input associated with the carrier gas flow downstream of the hopper. The differential pressure transducer (PT) outputs a signal related to a differential pressure between the first pressure input and the second pressure input. An electro pneumatic regulator (EP) is adapted to communicate with a control and receiving the signal related to the differential pressure.