... air operated thin film goes nonstop to the single-seat regulating valve to use goes against the guidance structure, ... supply the choice. Product characteristic· goes against the guidance single-seat regulating valve, the structure is compact, the part few, ... chest, valve cover: HT200, ZG230-450 ZG1Cr18Ni9TiValve core, valve seat: 1Cr18Ni9Ti, department too lai alloy built-up weldingSoft seal valve ...