BVNO 600 – Blast Valve for Protected Ventilation Systems

The BVNO 600 Blast Valve is a normally open, dual-action automatic valve designed for ventilation openings in protected spaces. According to the manufacturer’s product information, the valve allows air movement in and out of the protected space and automatically closes the air opening when exposed to blast-wave pressure. 

The BVNO 600 is intended for applications including civil defence shelters, bunkers, safe rooms, containers and industrial facilities. The product page also states that the valves are tested and certified for the SI4570 standard. 

How the BVNO 600 Blast Valve Works

The BVNO 600 is specified as a normally open, dual-action, automatic valve. Under normal conditions, it permits air movement through the ventilation opening. In the presence of blast-wave pressure, the valve automatically closes the opening.

According to the product information, this provides protection of the internal space from both the positive and negative phases of the blast wave. 

Main Specifications

The exact technical parameters listed on the Shelter-Shop product page are:

• Type: Normally open, dual action, automatic

• Maximum pressure durability: >2000 kPa (20 bar)

• Practical pressure durability: >900 kPa (9 bar)

• Nominal airflow: ~600 m³/h

• Pressure drop @ nominal: 200 Pa

• Mechanical shock resistance: >12 g

• Connection to wall: flange 8 Inch 

Nominal Airflow

The specified nominal airflow is approximately 600 m³/h.

This value is the nominal airflow parameter given for the BVNO 600 and is an important consideration when integrating the blast valve into a protected ventilation system. 

Pressure Durability

The BVNO 600 has two pressure-durability values specified by the manufacturer:

Maximum pressure durability: >2000 kPa (20 bar)

Practical pressure durability: >900 kPa (9 bar)

These values are part of the published technical specifications of the valve. 

Pressure Drop

The specified pressure drop at nominal airflow is 200 Pa.

This parameter should be considered when evaluating the BVNO 600 as part of a complete ventilation system, together with the airflow and other components installed in the system.

Mechanical Shock Resistance

The product specification lists mechanical shock resistance of >12 g.

This is one of the defined mechanical characteristics of the BVNO 600 and forms part of its technical specification for protected ventilation applications. 

8-Inch Wall Connection

The specified connection to the wall is an 8 Inch flange.

The flange connection is an important installation parameter when integrating the blast valve with a wall sleeve or corresponding ventilation opening.

Installation Applications

According to Shelter-Shop, BVNO 600 valves are designed for installation on ventilation openings in walls or as part of an air duct. The product page identifies applications including civil defence shelters, bunkers, safe rooms, containers and industrial facilities. 

The product information also states that the valves can be installed on pre-installed wall sleeves, retrofit flanges, air ducts and other connection options. Different configurations are available, including inline connections, special flanges and quick connectors. 

BVNO 600 and Protected Ventilation

A blast valve is an important component where ventilation openings must remain functional during normal operation while providing automatic closure under blast-wave conditions.

The BVNO 600 combines automatic dual-action operation with a nominal airflow of approximately 600 m³/h, pressure-drop specification of 200 Pa, mechanical shock resistance of >12 g, and an 8 Inch flange connection.

Technical Summary

Parameter	BVNO 600
Type	Normally open, dual action, automatic
Maximum pressure durability	>2000 kPa (20 bar)
Practical pressure durability	>900 kPa (9 bar)
Nominal airflow	~600 m³/h
Pressure drop @ nominal	200 Pa
Mechanical shock resistance	>12 g
Wall connection	Flange 8 Inch