... way, NC,with flow adjust screw, use with steam, water and air 2.FACTORY SALE Steam magnetic valves for ... steam,water,air ,gas 1/4", 2/2 way, NC, direct action, with flow ... adjust screw,.stand with high temperature. made by our own factory ... Weina ChenTel:+86-15958625103BONA VALVE steam magnetic valves(1/4" )