503 Parker Hannifin Corporation Fluid Control Solutions Europe General Catalogue FCSE/0112/UK V2.2 07/2022 SIZING SOLENOID VALVES The correct choice of solenoid valve is essential as it determines the regulation and performance required for practical application on a system. In order to decide on the exact type of solenoid valve, various parameters have to be known. However the calculation method, based on the flow coefficient Kv, has proved highly practical as it can be determined on the basis of: • Required flow rate • Type of fluid and relative viscosity • Flow resistance • Specific gravity and temperature This flow coefficient Kv is determined as defined in the VDI/VDE 2173 standards. It represents the flow of water in m3/h or L/min with a temperature from 5 to 30°C which passes through the solenoid valve with a pressure drop of 1 bar. After existing conditions have been converted into this factor Kv, the type of valve is found by referring to the pages in the related sections in this catalogue. Parameters used for selecting the solenoid valve are in the table next page. Consult conversion tables of the various units of measurement as defined by the ISO (International Standards Organisation) - I.S. (International System) set out in this catalogue. Ø D Rs P1 P2 Mp FG Vs Nr Cr 20 - D 1 - D 10 - D 15 - D VE1 Sp Ps Note: The flow coefficient used in the USA is known as Cv and represents the water flow rate in US gallons per minute with a pressure drop ∆P of 1 psi. To convert Cv in Kv and vice versa use: 1 Kv = 0.862 Cv 1 Cv = 1.16 Kv FG = Grid Filter Mp = Pump Vs = Safety Valve Nr = Check Valve Sp = Pressure Tank Ps = Static Pressure Manometer TECHNICAL INFORMATION
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