... ,Butterfly,high performance butterfly,fire fighting equipment Nominal Dia.DN50(2'')-DN200(8'') Clamp Butterfly Valve,Butterfly,high perfomance ... ducts for regulation or shutoff of water flow4) New design, small size and light weight5) Turbine or ... Provided with sealant structure for good sealing7) Provided with original sealant washer for convenient installation8) Good regulation performance, with the ...