double-impeller pump 双叶离心泵 ; 双级离心泵 ; 双叶轮泵

double channel impeller pump 双流道叶轮泵 ; 双路式叶轮泵

double channel impeller pump coupling 双流道叶轮泵联轴器

Double Impeller Pulp Pump 双流道纸浆泵

double action impeller pump 双作用叶片泵

double-channel impeller pump 双路叶轮泵