Качели проверка фланец клапан

1.Swing check valveis to prevent the line of medium back. Opening and closing pieces by medium flow and the forces to open or close the valve to prevent the media called the check back. Check valves are automatic valves, mainly for one-way flow of media channels, only allowing media to flow in one direction, to prevent accidents. 2.Swing check valves for nominal pressure PN1.0MPa 42.0MPa, Class150-2500; nominal diameter of DN15 1200mm, NPS1 / 2 48; working temperature -196 540 °C for various pipeline, to prevent medium back. 3.Available media:water.oil,steam.