YDF-WF-421-4，YDF-WF-422-4 

DF系列阀门用三相异步电动机，适用于无爆炸危险性混合物的普通场所，作电动阀门驱动元件，该系列电动机结构简单牢固，工作可靠，维修方便。 
上海耐鼎系列电机主要型号有YDF-WF-122-40.12KW,YDF-WF-211-4 0.18KW,YDF-WF-212-4 0.25KW,YDF-WF-221-4 0.37KW,YDF-WF-222-40.55KW,YDF-WF-231-4 0.75KW,YDF-WF-311-4 1.1KW,YDF-WF-312-4 1.5KW,YDF-WF-321-42.2KW,YDF-WF-322-4 3KW,YDF-WF-411-4 4KW,YDF-WF-421-4 5.5KW,YDF-WF-422-47.5KW,YDF-WF-431-4 11KW等.