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- Der Kv-Wert wird auch als Durchflussfaktor oder als Durchflusskoeffizient bezeichnet. Er ist ein Maß für den erzielbaren Durchsatz einer Flüssigkeit oder eines Gases durch ein Ventil und dient zur Auswahl und Dimensionierung von Ventilen. Der Wert wird in der Einheit m³/h angegeben und ist als effektiver Querschnitt interpretierbar. (de)
- The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate. Mathematically the flow coefficient Cv (or flow-capacity rating of valve) can be expressed as : where: Q is the rate of flow (expressed in US gallons per minute),SG is the specific gravity of the fluid (for water = 1),ΔP is the pressure drop across the valve (expressed in psi). In more practical terms, the flow coefficient Cv is the volume (in US gallons) of water at 60 °F (16 °C) that will flow per minute through a valve with a pressure drop of 1 psi (6.9 kPa) across the valve. The use of the flow coefficient offers a standard method of comparing valve capacities and sizing valves for specific applications that is widely accepted by industry. The general definition of the flow coefficient can be expanded into equations modeling the flow of liquids, gases and steam using the discharge coefficient. For gas flow in a pneumatic system the Cv for the same assembly can be used with a more complex equation. Absolute pressures (psia) must be used for gas rather than simply differential pressure. For air flow at room temperature, when the outlet pressure is less than 1/2 the absolute inlet pressure, the flow becomes quite simple (although it reaches sonic velocity internally). With Cv = 1.0 and 200 psia inlet pressure the flow is 100 standard cubic feet per minute (scfm). The flow is proportional to the absolute inlet pressure, so the flow in scfm would equal the Cv flow coefficient if the inlet pressure were reduced to 2 psia and the outlet were connected to a vacuum with less than 1 psi absolute pressure (1.0 scfm when Cv = 1.0, 2 psia input). (en)
- Il coefficiente di flusso o fattore di portata (flow coefficient), è un parametro di resistenza idraulica, indicato nella con Kv, e nella normativa americana Cv. Nella normativa europea è riferita ad acqua alla temperatura compresa fra 5 e 30 °C (di norma 15-16 °C), in quella americana ad acqua a 60 °F. Viene impiegata in particolare per ogni tipo di valvola, ma teoricamente è riferibile anche ad altri componenti idraulici e a sezioni di condotte. (it)
- Cv 流體係數是流體設備有關其允許流體流動能力的相對度量，描述的是、閥或其他組件的壓力差和流體通過流率之間的關係。 在數學上流體係數可以用以下方式定義： 其中：
* Cv為流體係數或閥的流量等級
* Q為流率，單位為美制單位 加仑/分鐘
* SG為流體的比重，水的比重為1
* ΔP為壓力差，單位為psi 在實務上，流體係數Cv是當閥或孔穴兩端的壓力差為1 psi時，60°F的水通過閥或孔穴的體積流率（單位：加仑/分鐘）。 流體係數是一種比較閥性能的方式，也是在不同的應用中選用閥的依據，廣為產業界使用，此定義可以延伸到有關液體、氣體或是蒸氣的方程式中。 是實際流量和理論流量之間的關係。 若是氣壓系統的氣體流，Cv可以用在更複雜的方程式中。需要用絕對壓力（psia）表示壓力，不能只用壓力差。 若在室溫下的空氣，且出口壓力小於1/2入口絕對壓力，其流場相當單純（不過其內部已到達音速）。若Cv = 1.0，入口壓力為200 psia，其流率為100 標準立方米/分（scfm）。其流率正比於入口絕對壓力，因此若以入口絕對壓力減為2 psia，出口壓力小於1 psi絕對壓力，scfm表示的流率會等於Cv（若Cv = 1.0, 2 psia 輸入時，流率為1.0 scfm）。 (zh)
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- Der Kv-Wert wird auch als Durchflussfaktor oder als Durchflusskoeffizient bezeichnet. Er ist ein Maß für den erzielbaren Durchsatz einer Flüssigkeit oder eines Gases durch ein Ventil und dient zur Auswahl und Dimensionierung von Ventilen. Der Wert wird in der Einheit m³/h angegeben und ist als effektiver Querschnitt interpretierbar. (de)
- Il coefficiente di flusso o fattore di portata (flow coefficient), è un parametro di resistenza idraulica, indicato nella con Kv, e nella normativa americana Cv. Nella normativa europea è riferita ad acqua alla temperatura compresa fra 5 e 30 °C (di norma 15-16 °C), in quella americana ad acqua a 60 °F. Viene impiegata in particolare per ogni tipo di valvola, ma teoricamente è riferibile anche ad altri componenti idraulici e a sezioni di condotte. (it)
- Cv 流體係數是流體設備有關其允許流體流動能力的相對度量，描述的是、閥或其他組件的壓力差和流體通過流率之間的關係。 在數學上流體係數可以用以下方式定義： 其中：
* Cv為流體係數或閥的流量等級
* Q為流率，單位為美制單位 加仑/分鐘
* SG為流體的比重，水的比重為1
* ΔP為壓力差，單位為psi 在實務上，流體係數Cv是當閥或孔穴兩端的壓力差為1 psi時，60°F的水通過閥或孔穴的體積流率（單位：加仑/分鐘）。 流體係數是一種比較閥性能的方式，也是在不同的應用中選用閥的依據，廣為產業界使用，此定義可以延伸到有關液體、氣體或是蒸氣的方程式中。 是實際流量和理論流量之間的關係。 若是氣壓系統的氣體流，Cv可以用在更複雜的方程式中。需要用絕對壓力（psia）表示壓力，不能只用壓力差。 若在室溫下的空氣，且出口壓力小於1/2入口絕對壓力，其流場相當單純（不過其內部已到達音速）。若Cv = 1.0，入口壓力為200 psia，其流率為100 標準立方米/分（scfm）。其流率正比於入口絕對壓力，因此若以入口絕對壓力減為2 psia，出口壓力小於1 psi絕對壓力，scfm表示的流率會等於Cv（若Cv = 1.0, 2 psia 輸入時，流率為1.0 scfm）。 (zh)
- The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate. Mathematically the flow coefficient Cv (or flow-capacity rating of valve) can be expressed as : where: Q is the rate of flow (expressed in US gallons per minute),SG is the specific gravity of the fluid (for water = 1),ΔP is the pressure drop across the valve (expressed in psi). (en)
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- Kv-Wert (de)
- Flow coefficient (en)
- Coefficiente di flusso di una valvola (it)
- Cv (流體係數) (zh)
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