Hello,Could somebody explain (if possible) how a two-stage pressure-reducing valve (PCV) can allow to avoid choked flow through it,Safety valves when upstream pressure is 10000 mbarg (10 barg) and downstream pressure is 50 mbarg? The simplest explanation is that it won't, Plug ValvesIf I have got the theory right.Any valve will have a max capacity given by the Cv and the driving force given by the pressure difference before and after the valve.If the pressure difference is large enough, the valve will choke. (Choke: max velocity reached)I believe you are talking about gas.If you, however, are talking about liquid water, Reducing Valvescavitation will occur, but the valve construction will allow for this, formed to accept or send cavitation to areas not (much) affected by gas-bubbels collapsing. Balance ValvesMay I suggest that you give more details about your problem?50 millibar and nitrogen suggest that you are perhaps working with nitrogen for nitrogen blanketing purposes.If this is the case, this is an art in itself, but solved with standard commercial products, but requiring knowledge and the correct valves both for inlet and outlet for the (closed tank?) system, including correct type inlet valve, API Cast Steel Valvesand correct type outlet (overflow or overpressure relief valve).Anyway: you normally start the the procedure by selecting a valve after the normal flow conditions, aiming at having a normal flow in the upper middel (up to 80%) of the valves capacity upholding the given pressure (eg. no choking).

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