| http://www.w3.org/ns/prov#value | - downstream pressure P2, and the flow rate Qc of a specific gas type can be calculated as Qc=KP1, wherein K is a constant, wherein the control valve is controlled to open or close according to a difference signal between a calculated flow rate Qc and a set flow rate Qs, further comprising a storage means for storing a flow factor ratio FFB/FFA of gas type A to gas type B, which is calculated for ea
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