Parker Hannifin Corporation Fluid Control Solutions Europe General Catalogue FCSE/0112/UK V2.2 07/2022 504 FLOW AND PRESSURE RANGES a)Solenoid valves for liquids: Flow rate: Q = Kv •√ΔP where: Q = l/min γ ΔP = bar γ = Kg/dm3 Flow coefficient: Kv = Q •√ γ ΔP In the case of liquids with viscosity greater than 3°E (22 cStokes) the Kv is modified according to the formula: Kv1 = Kv + C C = δ •√Kv + 1 200 • Q where C is the viscosity correction factor calculated by means of the formula: where: δ = kinematic viscosity of the fluid expressed in centistokes Kv = flow rate factor of the solenoid valve Q = flow rate in l/min Pressure drop: ΔP = γ • ( Q )2 Kv Pressure symbol (P) unit of measurement [bar] Working pressure Pressure drop symbol (∆P) unit of measurement [bar] Pressure difference between inlet (P1) and outlet (P2) of the solenoid valve when a medium is flowing through the valve (ΔP = P1 - P2). Flow cœfficient symbol (Kv) unit of measurement [l/min] Specific gravity of the medium symbol ( γ) unit of measurement [Kg/dm3] Temperature of the medium symbol (t) unit of measurement [°C] Flow rate • for liquids symbol (Q) unit of measurement [l/min] • for gases symbol (Qn) unit of measurement [Nm3/h] • for steam symbol (Qv) unit of measurement [Kg/h] Specific volume symbol (Vs) unit of measurement [m3/Kg] TECHNICAL INFORMATION
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