BVNO 1000 Blast Valve: Automatic Blast Protection for Protected Ventilation Systems

Oct 14

3 min read

Ventilation openings are an important part of protected facilities because they must allow the movement of air while maintaining the required level of protection against external hazards. The BVNO 1000 Blast Valve is a normally open, dual-action automatic valve designed for ventilation systems in protected spaces.

According to Shelter Shop, the valve allows air to move in and out of the protected space during normal operation and automatically closes the air opening when exposed to blast-wave pressure. The design addresses both the positive and negative phases of a blast wave. Shelter Shop

Operating Principle

The BVNO 1000 is described as a normally open, dual-action automatic blast valve.

During normal ventilation operation, the valve allows airflow through the ventilation opening. When subjected to blast-wave pressure, the valve automatically closes the opening.

According to the manufacturer's description, this mechanism is intended to protect the internal space from both the positive and negative phases of a blast wave. Shelter Shop

Applications

The BVNO 1000 is designed for installation in ventilation systems serving:

Civil defence shelters
Bunkers
Safe rooms
Containers
Industrial facilities
Other protected applications

The valve can be installed directly in ventilation openings in walls or as part of an air-duct system. Shelter Shop

Installation Options

According to Shelter Shop, the BVNO 1000 can be installed using different connection configurations, including:

Pre-installed wall sleeves
Retrofit flanges
Air ducts
Other compatible installation options

The valve is also available in configurations for inline connection, special flanges and quick connectors. Versions with a pre-filter for removing dust particles are available as well. Shelter Shop

Main Technical Specifications

Parameter	Specification
Valve type	Normally open, dual action, automatic
Maximum pressure durability	>2,000 kPa (20 bar)
Practical pressure durability	>900 kPa (9 bar)
Nominal airflow	≈1,000 m³/h
Pressure drop at nominal airflow	200 Pa
Mechanical shock resistance	>12 g
Wall connection	8-inch flange

These are the specifications published for the BVNO 1000 by Shelter Shop. Shelter Shop

Pressure and Mechanical Resistance

The published maximum pressure durability of the BVNO 1000 is greater than 2,000 kPa (20 bar), while the specified practical pressure durability is greater than 900 kPa (9 bar).

The manufacturer also specifies mechanical shock resistance above 12 g.

The valve is additionally described as resistant to corrosion and capable of operating across a wide range of temperatures. Shelter Shop

Airflow Characteristics

The BVNO 1000 has a published nominal airflow of approximately 1,000 m³/h with a pressure drop of 200 Pa at nominal airflow.

These parameters are relevant when evaluating the valve's compatibility with the ventilation and air-management system in which it is installed. Shelter Shop

Certification

Shelter Shop states that the BVNO 1000 valves are tested and certified for the SI4570 standard. Shelter Shop

Available Configurations

The Shelter Shop product range lists several BVNO 1000 configurations, including:

BVNO 1000 8Y – valve only
BVNO 1000 8YZ – valve with flange
BVNO 1000 8X – valve with pre-filter
BVNO 1000 8L – case with 90° outlet and pre-filter
BVNO 1000 8Z – case with inline outlet and pre-filter

The exact configuration can therefore be selected according to the required installation arrangement. Shelter Shop

Conclusion

The BVNO 1000 Blast Valve is a normally open, dual-action automatic valve designed for protected ventilation systems. During normal operation, it permits airflow, while exposure to blast-wave pressure activates automatic closure of the ventilation opening.

According to the published specifications, the valve provides approximately 1,000 m³/h nominal airflow, 200 Pa pressure drop at nominal airflow, >2,000 kPa maximum pressure durability, >900 kPa practical pressure durability, and >12 g mechanical shock resistance. The standard wall connection is an 8-inch flange. Shelter Shop

The manufacturer also states that the BVNO 1000 is tested and certified to SI4570, and the product is available in several configurations, including versions with pre-filters and different connection arrangements. Shelter Shop