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Shelters and Protective Technologies
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Blast Dampers

Blast valves and dampers are normally open valves which allow movement of air in regular operation and provide automatic closing action in case of incoming blast wave. The valves are designed for installation on ventilation openings or as part of the duct for protection of ventilation ways and internal spaces against destructive blast wave effects.

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HDB - Blast Damper

  • MIN Size: 200 mm x 200 mm (W x H)

  • MAX Size: 2000 mm x 2400 mm (W x H),

  • Shock tube tested (Maximum pressure is 6 bar, 12.9ms; 1.1 bar, 57ms (peak reflected pressure), VTT

  • ATEX certified (Gas) IIC, Zone 1 & 2, IIC, T6...T2 (Dust), Zone 21 & 22, IIIB, T70ºC~T285ºC, TUV

  • The normal operating temperature is between -40 ºC to +300 ºC, 30 mins, SGS

  • Aerodynamic testing according to AMCA-500

  • Excellent corrosion resistance, passed the 1440h salt spray corrosion test follow the standard DIN EN ISO 9227: 2006

  • Equipped with grid preserving from the debris impact

  • Self-actuating closing and opening

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MZS - Blast Damper

​MZS protective section designed to protect ventilation devices of special-purpose buildings from the effects of a shock wave of long duration with a pressure up to 10 kg/cm² (1000 kPa)

Protective sections closes automatically, under the pressure of the blast wave, covering ventilation openings or air ducts and provide protection against the penetration of a blast wave into the shelter.

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  • Min Size: 282 mm x 321 mm (W x H)

  • Weight: 5 kg

  • Airflow: 1500 m3/h

  • Pressure drop:  up to 250 Pa

  • Blast wave pressure resistance: long duration 0.3 to 10 kg/cm² (30-1000 kPa)

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UZS - Blast Damper

  • ​UZS Protective section designed to protect ventilation devices of special-purpose buildings from the effects of a shock wave of long duration with a pressure up to 10 kg/cm² (1000 kPa)

  • Protective sections closes automatically, under the pressure of the blast wave, covering ventilation openings or air ducts and provide protection against the penetration of a blast wave into the shelter.

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  • Min Size: 595 mm x 649 mm (W x H)

  • Weight: 25 kg

  • Airflow: 8000 m3/h

  • Pressure drop: up to 210 Pa

  • Blast wave pressure resistance: long duration 0.3 to 10 kg/cm² (30-1000 kPa)

Blast Dampers

Blast dampers are used in ventilation systems to prevent the blast wave through external walls into the building. They are designed with high ventilation capacity. The dampers can protect people and equipment from explosions or momentary pressure change (e.g. tornadoes, etc.). When an explosion occurs, the valve will close instantly under the action of the shock wave; when the shock wave disappears, the valve will be automatically restored. They are mainly used in refineries, oil & gas, nuclear power plants and some other facilities which are at risk of explosions. They are installed on the air openings (air inlet and air outlet) of the facilities.

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