Butterfly Valve,Butterfly Valve,high performance butterfly valve,fire fighting valve Dia.:DN50(2'')--DN200(8'') Butterfly Valve,Butterfly Valve,high performance butterfly valve,fire fighting valveFeatures:1) Varieties: turbine signal butterfly valve, throw butterfly valve2) Especially applicable to ... :4-70°C 14)Applicable environment: clean water, foam liquids Butterfly Valve