... pipeline, has no corrode, the life long The feature of fireproof control valve FFH-2, control valve,discharge fume valveIt is ... closes.Installs noticeDN20,≤6m,≤3,≥90°,≥300mm.The telemechanics control cable when installs should wrap in the DN20 steel pipe, span ... multi-bladed fire protection smoke vents far in the control cable going beyond a line position ordinary circumstancesIn place above,In ...