Gas-tight shut-off dampers

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layer

BDD

  • The damper casing and blades are made from 1.5mm thick galvanized steel sheet.
  • The blades are fitted with 12 mm diameter mild steel spindle in zinc plating.
  • The blade spindles are connected to the damper casing with bearing journals which have a maximum operating tamperature of 80 °C.
  • The damper has face linkage with parallel blade arrangement.
  • Counter-weight arm(s) is fitted to the side of the damper casing complete with adjustable weights, located outside of the air stream.
  • The blades are fitted with tip seals made of Silicon rubber.

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layer

NAK

Fulfils the level of 'leak tightness' required by KTA Guideline 3601 (German Nuclear Safety Standards Commission, KTA) and by DIN 25496 even when the power supply or compressed air supply fails

  • Compact construction and robust actuator mechanism allow for any installation orientation
  • Maximum leakage air flow of closed damper is 0.0028 (l/s)/m² or 0.01 (m³/h)/m² at a differential pressure of 2000 Pa
  • Gas-tight closure, even when there is no power, due to special toggle lever principle
  • Variants with hand wheel, pneumatic actuator or electric actuator
  • Brass bearings
  • Powder-coated casing and blades
  • Maximum pressure loading of 5000 Pa, in closing direction
  • Available in standard sizes and many intermediate sizes


Optional equipment and accessories

  • Flange holes
  • Limit switch
  • Double acting pneumatic actuator, with optional solenoid valve
  • Electric actuator 3~ 400 V AC, 50 Hz or 1~ 230 V AC, 50 Hz


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Tel.: +91 (0) 22 6775-1600 | Fax: +91 (0) 226775-1613

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Tel.: +91 (0) 22 6775-1600 | Fax: +91 (0) 226775-1613

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