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BVNO 2900 Blast Valve: Double-Action Blast Protection Valve for Civil Defence Shelters and Protected Facilities

Sep 25
3 min read

Modern civil defence shelters, bunkers and protected facilities require ventilation systems that maintain normal airflow while automatically protecting the protected space during a blast event. The BVNO 2900 Blast Valve is a normally open, double-action blast valve designed to automatically close under blast wave pressure, protecting the interior against both the positive and negative phases of a blast wave. According to the manufacturer, the valve is intended for ventilation openings in walls or as part of air duct systems installed in shelters, bunkers, safe rooms, containers and industrial facilities.

Official product page:


Product purpose

According to the manufacturer, the BVNO 2900 is designed for installation in:

  • civil defence shelters;

  • bunkers;

  • safe rooms;

  • protective containers;

  • industrial facilities;

  • protected ventilation systems.

The valve enables normal air movement during standard operation while automatically sealing the ventilation opening when subjected to blast wave pressure.


Operating principle

The BVNO 2900 is described as a normally open, dual-action automatic blast valve.

During normal operating conditions:

  • fresh air enters the protected space;

  • exhaust air exits normally;

  • ventilation operates without restriction.

When a blast wave reaches the valve:

  • the valve automatically closes;

  • airflow is immediately interrupted;

  • the protected space is isolated from the blast wave;

  • protection is provided against both positive and negative blast pressure phases.

According to the manufacturer, no external power supply is required for the automatic protective action.


Applications

The manufacturer specifies the valve for use in:

  • civil defence shelters;

  • military bunkers;

  • safe rooms;

  • protected buildings;

  • industrial facilities;

  • containerized protection systems;

  • ventilation duct installations.

The valve may be installed:

  • directly in ventilation wall openings;

  • on pre-installed wall sleeves;

  • on retrofit flanges;

  • within ventilation duct systems;

  • using optional connection configurations.


Main technical specifications

According to the published product information, the BVNO 2900 has the following specifications:

Parameter

Specification

Valve type

Normally open, dual action, automatic

Nominal airflow

≈ 2900 m³/h

Maximum pressure durability

>2000 kPa (20 bar)

Practical pressure durability

>900 kPa (9 bar)

Pressure drop at nominal airflow

200 Pa

Mechanical shock resistance

>12 g

Wall connection

14-inch flange

These values are published by the manufacturer on the official product page.


Construction and durability

According to Shelter-Shop, the BVNO 2900 is designed for demanding operating environments.

The manufacturer states that the valve:

  • is highly durable;

  • resists corrosion;

  • operates across a wide temperature range;

  • is suitable for long-term installation in protected facilities.


Installation options

The manufacturer indicates multiple installation configurations, including:

  • pre-installed wall sleeves;

  • retrofit flanges;

  • air ducts;

  • inline installations;

  • special flanges;

  • quick connectors.

This allows integration into both new shelter construction projects and existing ventilation systems.


Optional configurations

According to the manufacturer, the BVNO 2900 may be supplied with additional options, including:

  • integrated pre-filter;

  • dust particle removal capability;

  • inline connection versions;

  • special flange configurations;

  • quick connector options.

These configurations are intended to accommodate different ventilation system designs.


Testing and certification

The manufacturer states that the BVNO 2900:

  • has been tested;

  • is certified according to SI4570;

  • is intended for blast protection applications in protected facilities.

The certification information is published by the manufacturer on the official product page.


Ventilation system integration

According to the manufacturer, the BVNO 2900 is designed to operate as a component within protected ventilation systems where controlled airflow and automatic blast protection are required.

Typical applications include integration with:

  • blast-resistant ventilation systems;

  • shelter air filtration systems;

  • CBRN ventilation equipment;

  • protected air ducts;

  • safe room ventilation networks.


Conclusion

According to the manufacturer, the BVNO 2900 Blast Valve is a normally open, dual-action automatic blast valve developed for protected ventilation systems in civil defence shelters, bunkers, safe rooms, containers and industrial facilities. Published specifications include an approximate airflow capacity of 2900 m³/h, pressure durability exceeding 2000 kPa (20 bar), practical pressure durability above 900 kPa (9 bar), a nominal pressure drop of 200 Pa, mechanical shock resistance greater than 12 g, and a 14-inch flange wall connection. The manufacturer also states that the valve is tested and certified to SI4570 and can be supplied with multiple installation and configuration options for integration into protected ventilation systems.



 
 
 

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