... ,ISO9001 3.materials:cast iron,cast steel, Marine Globe Valve 1.JIS.DIN.APL.ANSI.GB ... .0Mpa. DN: 15mm-1200mm We specialize in producing marine valve and air vent (pipe) heads according to ... and RK casting bronze foundry,It is the leading company in RK Marine and one of the top manufacture ... , quick-closing valve , air vent head and other marine accessories, The main materials are cast iron . ductile iron ...