(Swing Check Valves)• DN 50-400 PN 1.6-16 MPa;• Back Flow Valves are made of steel grades 20L, 20GL, 12H18N9TL, 12H18N12MZTL with flange connectionЗТЛ, 20ГМЛ, 20XН3Л, 20Х5МЛ Send requestTelephone number*E-mail*Number of goodsName of product*ComentsSend request