... by one or series connection. Accurate measure, along with convenient and stable operation.II. Operation principle:This device uses the static ... DN25 DN50 copper ball valves. DN80, DN150, DN 200 DN300 and DN400 electronic ball valve.working bench:Main technical parameters:working ... 100,150)DN80-200:DN80(100,150,200)DN80-300:DN80(100,150,200,250,300)DN80-400 :DN80(100,150,200,250,300,400)moving distance ...