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1. Description of the elementary physical process
1.1 Control structure
A highly simplified and conventional diagram shows a gas flow q e coming from the furnaces, a large valve (GV) and a small valve (PV), regulating elements acting in parallel, a pressure measurement in the barrel P bar that needs to be regulated, a back pressure P downstream also measured, and a gas flow q s entering the manifold (figure 1 ).
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Description of the elementary physical process
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