... outlet pressure is higher than inlet pressure across valve, a few medium can flow across the valve in opposite ... air,water and oil.Optional voltage of solenoid coils: A.C.: 24V,36V,110V,220V,380V.D.C.:12V ... Kv value is the water flow in m3/h at a pressure drop across valve of 0.1MPa,ρ=1000 ... kg/m3Letters after the model: A means improved type,W means solder ODF,F means waist flange,K means normal ...