1.ISO9001/ISO14001 2.air damper fire damper,air damper,volume control damperThe functions of fireproof valves NameModelFunction codeFunctionsspecificationShapeDiacharge fume valvePYF-1SDDC24V turned on,manual open,hand reset,out put opening signal≥200*200rectanglePYF-3SD≥Φ200roundDischage fume and fireproof valvePYFH-3SFDDC24V turned on,manual open,hand reset,out put opening signal,turned off ...