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Description:Type:welding/welding,welding/screw,screw/screw Standard: DIN, SMS, ISO, 3A, IDF, RJT available Material: SUS304, SUS304l, SUS316, SUS316l available Size: DN25-DN150 or 1"-6" available Working principle: Remote-controlled operation by the driving gear or manual operation by the handle Three drive forms: Normally closed, normally opened and closed by two air flues separately