EWN-A N E W series P R O D U C T Electromagnetic metering pumps Automatic air vent type The optimum for gaseous liquid feeding Electromagnetic metering pumps This type equips automatic air vent mechanism. An air vent valve builtin pump chamber enables reliable air venting. Also equipped manual air vent valve enables easy pressure release in discharge piping. Gaseous liquid such as sodium hypochlorite or hydrogen peroxide can be injected without gas locking. • Entrained air is automatically expelled from the pump head. No special degassing is needed. • The pump immediately resumes operation without gas lock even after a long period of stoppage. • Use the air vent port manually for quick release of discharge line pressure. • Capable of pumping concentrated sodium hypochlorite Principle of operation Manual air vent port Manual air vent adjusting screw Air • Air which comes from suction port goes to the connection adapter through pump head. Because Automatic air vent valve pump discharge side is pressurized, air goes to the automatic air vent valve which the pressure load is Valve lower than pump discharge side, and goes out little by little together with liquid. Pump head • Once the pump gets out of locked air condition, it returns to normal operation to discharge the liquid. A ittle bit of liquid is discharged from automatic bleed valve, too. Fitting adapter Suction port

Pump identification EWN - B 11 VC Series symbol EWN-A series E R A- Drive unit symbol Average power consumption B: 20W C: 24W Diaphragm diameter Effective diaphragm dia. 11: 10mm 16: 15mm 21: 20mm Special configuration code Special version code A : Automatic air vent type Controller function code R: Standard type Wet-end material symbol For details, see the table of materials. VC,VH Power code E: with European cord Connection For details, please contact us. Wet-end materials 12 6 Parts name 1 Pump head 2 Fitting nut 3 Air vent body B 4 Lock nut 5 Diaphragm 6 Air vent body A 7 Valve guide 8 Valve...