... cast iron cast aluminium, engineering plasticsAir source pressure (Mpa):0.25~0.4Allowable leakage amount:Class VI GB/T4213~92aControl signal ... .1 Mpa . Flow features:Fast open, linear Nominal diameter DN(mm)Outline dimensions DLH25105120250251151402653214016028540150180300501652003106518527634080200298360100220352375150285480445200340543500Flange dimensionsConvexity steel tube flange GB9113.3~GB9113 ...