dual plate wafer check valve the weight is light , like butterfly , slowly close , the life is long ,open steady dual plate wafer check valve1. name : daul plate check valve2. size : DN50--1000mm3. pressure : PN0.6 , 1.0, 1.6(MPa)4. medium : water normal liquid5. temperature :≤100oC 6. material : ash cast iron , nodula cast iron , stainless steel7. payment : T/T L/C