Non-Return Damper - Halton

BLD DIMENSIONS AND MATERIAL THICKNESSBLD non-return dampers meet international standardsfor both rectangular (width B 200-1200 and heightH 200-1400 mm, 50 mm division) and circular ducts(Ø100 - 1250 mm). Special non-standard dimensionsGENERAL BLD DRAWINGH+58H+4RIGHT HAND MODELMin50nx150 nx150185 IF H= 2502724130are available on request. Modular construction sizesup to 2400x2800 mm are available. Standard framematerial thickness 3 mm. Blades made of two sheets,each being 0.8 mm thick.BLD DRAWING TOP2523190130V1M08Y2006/Halton Marine reserves the right to alter products without notice.10Ø 1210nx150 nx150 Min50B+4B+58BLD DRAWING, CIRCULAR CONNECTIONSBLD DRAWING, CIRCULAR CONNECTIONSWIDTH+58130nx150nx150Min50185 IF H=20020 IF H>200Min50HEIGHT+58DIAMETER-2nx150 nx150ØD10ALL BOLT HOLES Ø 12BOLTS M10x30190358BLD - Non-Return Damper

BLD PRODUCT MODELS AND ACCESSORIESModels for horizontal and vertical installation available.Circular connection pieces are available. Counterweights can supplied on request.BLD LEAKAGE TEST, DAMPER SIZE 1000x1000OPERATION PRINCIPLENon-return damper will allow one-way airflow in theductwork. This feature is based on imbalanced blades.When the pressure in the ductwork drops belowminimum opening force required, the blades closeand seal the duct to prevent backflow. The minimumopening force can be adjusted with optional weights.V1M08Y2006/Halton Marine reserves the right to alter products without notice.Closed blade leakage.EN 1751:1998Duct cross sectional area: 1,00 m2Air density 1.20 kg/m3Closed damper fullfils the leakage requirement of NORSOK; maximumleakage 300 m3/h/m2 (83,3 dm3/s/m2) at 2000 Pa.Closed damper fullfils the requirement of leakage class 2 (EN 1751:1998).(negative pressure)Symbols and unitsPs Static test pressureqVLBA Closed blade leakage air flow per duct cross sectionalarea, dm3/s/m2WEIGHTS OF HALTON MARINE BLD DAMPERS (KG)H/HeightB / Width (mm)mm 200 300 400 500 600 700 800 900 1000 1100 1200 D2 ØD Weight200 8 10 12 14 16 17 19 20 22 24 25 mm kg300 11 13 15 17 19 20 22 24 26 28 29 200 12400 13 15 17 19 21 23 24 27 29 30 32 250 14500 15 18 20 22 24 26 28 30 32 34 36 315 18600 17 20 22 24 26 29 31 33 35 37 40 400 23700 20 22 25 27 30 32 34 37 39 41 44 500 31800 22 24 27 29 32 34 37 40 42 44 47 630 40900 24 27 30 32 35 38 41 43 46 48 51 800 541000 26 29 32 35 38 40 43 46 49 51 54 1000 731100 29 32 35 38 41 44 47 50 53 55 58 1250 941200 31 34 37 40 43 46 49 52 56 58 621300 33 37 40 43 46 50 53 56 59 62 661400 35 39 42 45 49 52 56 59 62 65 69Weights do not include counter weightsBLD - Non-Return Damper

BLD - Non-Return DamperV1M08Y2006/Halton Marine reserves the right to alter products without notice.