... used for the defrosting of wind cooling heat pump refrigeration unit and the defrosting of supermarket refrigerators as well ... stem will drop and close the small orifice because of spring force and its weight. When inlet pressure ... R407C,R404A/507,air,water and oil.Optional voltage of solenoid coils: A.C.: 24V,36V,110V, ... m3/h at a pressure drop across valve of 0.1MPa,ρ=1000 kg/m3Letters after the model: ...