... and customized designs 3.clear and easy control panels 4.stable viscosity control (1)Fuel supply unit is the fuel control ... ,circulating pump ,strainer,fine filter(auto or half-auto filter),flow meter,mixed oil tank.heaters(by steam,by hot oil or ... pump,circulating pump,strainer,auto filter or duplex backwash filter,flow meter,mixed oil tank ,composite heating device,viscosity and temperature control ...