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	In the following we have compiled some calculation options for you. For liquids and gases it is possible to calculate the kv value, the flow Q and the pressure drop Δp. With the calculations for gases, one additionally distinguishes between the under-critical (p2 > p1/2) and over-critical cases (p2 < p1/2). All calculations are purely practical formulas, i.e. simplifications for the respective case, which may only be used with the specified units.   kv value In order to calculate the kv value the flow Q, the density ρ1 of the media at the valve inlet and the pressure drop (Δp) across the valve must be known: Q = m³/h = m³/h   ρ1 = kg/m³ Δp = bar flow In order to calculate the flow Q the kv value, the density ρ1 of the media at the valve inlet and the pressure drop (Δp) across the valve must be known: kv = m³/h = m³/h   ρ1 = kg/m³ Δp = bar pressure drop In order to measure the pressure drop Δp the kv value, the density ρ1 of the media at the valve inlet and the flow Q must be known: kv = m³/h = bar   ρ1 = kg/m³ Q = m³/h   kv value In order to calculate the kv value the volumetric flow Qn at 1013 hPa and 0°C, the standard density ρn of the media, the pressure drop (Δp) across the valve, the media pressure p2 downstream of the valve and the media temperature at the valve inlet must be known: Qn = Nm³/h = m³/h ρn = kg/Nm³ Δp = bar p2 = bar = m³/h T1 = °C °F flow In order to calculate the flow Qn the kv value, the standard density ρn of the media, the pressure drop (Δp) across the valve, the media pressure p2 downstream of the valve and the media temperature at the valve inlet must be known: kv = m³/h = Nm³/h ρn = kg/Nm³ Δp = bar p2 = bar = Nm³/h T1 = °C °F pressure drop In order to calculate the pressure drop Δp the kv value, the volumetric flow Qn at 1013 hPa and 0°C, the standard density ρn of the media, the media pressure p2 downstream of the valve and the media temperature at the valve inlet must be known: kv = m³/h = bar Qn = Nm³/h ρn = kg/Nm³ p2 = bar     if T1 = °C °F   direct acting valves 2/2 way 3/2 way NC NO NC only one flow direction NO only one flow direction NC NO IV 10 / 16-3 dxf-download dxf-download dxf-download dxf-download   externally controlled valves - pneumatic 2/2 way 3/2 way NC NO NC NO dxf-download dxf-download dxf-download dxf-download   externally controlled valves - hydraulic 2/2 way 3/2 way NC NO NC NO dxf-download dxf-download   control valves pressure limitation valves SPB 08 SPB 65 HPB 08 3-HPB 08 HPB 65 3-HPB 65 dxf-download dxf-download dxf-download dxf-download SPB-N 15 SPB-S 15, SPB-H 15 3-HPB-N 15 3-HPB-S 15, 3-HPB-H 15 dxf-download dxf-download dxf-download dxf-download   pressure reduction valves pressure control valves flow control valves SPI 08, SPP 15, SPI 32 HPI 08, HPP 15, HPI 32 3-HPI 08, 3-HPP 15, 3-HPI 32 SPP 15 DR RMQ dxf-download dxf-download dxf-download dxf-download   pilot valves 5/2 way pilot valve 5/2 way pilot valve impulse controlled 3/2 way pilot valve main valve monostable dxf-download dxf-download dxf-download