air damper,air volume control (ISO9001/ISO14001) control air volume 1 Media:gas 2 high pressure The introduction of air volume valve ,air damper air damper,air volume control (ISO9001/ISO14001)control air volume1 Media:gas2 high ... Φ2 7Inspection opengingΦ120 8FD,FVD,SFVD the standard of control deviceRating voltageDC24V Rating electic current0.6~0.8A Micromotion swicthVolume ...