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Blast & Special Ventilation Valves

Blast, Overpressure and Gastight Valves for Shelters, Protected Spaces and Industrial Ventilation and Air Filtration Systems

Atmas presents a wide selection of blast valves and overpressure valve for ventilation and air filtration systems of civil defence shelters, safe rooms, industrial applications and other types of protective structures which require protection of ventilation ways and internal space from blast wave pressure coming from outside.

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Our professional, tested and certified valves are installed in thousands of facilities to protect people and equipment. The valves are approved by various civil defence authorities and certified according to most modern standards.

The blast valves provide automatic dual action operation protecting both from positive and negative phases of the blast.


The valves we offer can be used in new construction or retrofitted in existing (modernization) projects.​​​

Our Range of Valves for Ventilation Systems

BVNO Blast Valves - Normally Open Valves
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Blast valves are protective valves which are normally open and allow movement of air for both directions (in and out of the protected space). Blast valves are usually installed on ventilation openings or on air ducts of the ventilation system for protecting the inner space of the shelter, room or a structure from blast pressure wave (both positive and negative phases). 

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BVNO Valves Range:

  • BVNO 50 - 50 m³/h nominal airflow @ 200 Pa

  • BVNO 550 - 550 m³/h nominal airflow @ 200 Pa

  • BVNO 600 - 600 m³/h nominal airflow @ 200 Pa

  • BVNO 1000 - 1000 m³/h nominal airflow @ 200 Pa

  • BVNO 1800 - 1800 m³/h nominal airflow @ 200 Pa

  • BVNO 2600 - 2600 m³/h nominal airflow @ 200 Pa

  • BVNO 2900 - 2900 m³/h nominal airflow @ 200 Pa

 

Returned Pressure Durability: >900 (9) Kpa (bar)

Mechanical Shock Resistance: >12 g

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* The values present for the Y version (valve with protection only)

* BVNO blast valves can be equipped with special casing for connection to air duct, flanges, prefilter, quick connectors and more.

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BVNС Overpressure Blast Valves - Normally Closed Valves
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Overpressure valves are normally closed valves designed to maintain the overpressure inside the protected area in predetermined values and can be blast protected. The operation of such valve is to stay closed until a predefined level of overpressure reached in the chamber / shelter and automatically to release the air / pressure to prevent it raising the allowed values.

 

BVNC Valves Range:

  • BVNС 40 - 40 m³/h nominal airflow @ 200 Pa

  • BVNС 300 - 300 m³/h nominal airflow @ 200 Pa

  • BVNС 600 - 600 m³/h nominal airflow @ 200 Pa

  • BVNС 1500 - 1500 m³/h nominal airflow @ 200 Pa

  • BVNС 2100 - 2100 m³/h nominal airflow @ 200 Pa

  • BVNС 3300 - 330 m³/h nominal airflow @ 200 Pa

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Returned Pressure Durability: >900 (9) Kpa (bar)

Mechanical Shock Resistance: >12 g

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* The values present for the Y version (valve with protection only)

* BVNС blast valves can be equipped with special casing for connection to air duct, flanges, prefilter, quick connectors and more.

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PRV Differential Pressure Regulation Valves 
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PRV 800 valves are designed to maintain constant pressure in the rooms in which they are installed. They are used to regulate pressure between the rooms in protected space and are equipped with a knob which helps to perform the regulation on site. These valves are to be installed on the internal walls of the building and usually facing the higher pressure side but will also work if installed on the lower pressure side of the room.​

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BVNO Range:

  • PRV 800 - 50-800 m³/h airflow​​

GK Gas Tight Shut-Off Valves
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Gas-tight valves are designed for installation on ventilation air ducts as a shut-off devices and serve to control the airflow or to be a barrier for the air passing into or out from the protected space.

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GK Valves Range:

  • GK 100 - 100 mm nominal opening 

  • GK 150 - 150 mm nominal opening 

  • GK 200 - 200 mm nominal opening 

  • GK 250 - 250 mm nominal opening 

  • GK 300 - 300 mm nominal opening ​

  • GK 350 - 350 mm nominal opening 

  • GK 400 - 400 mm nominal opening 

  • GK 630 - 630 mm nominal opening 

  • GK 730 - 730 mm nominal opening 

  • GK 800 - 800 mm nominal opening 

  • other sizes available by request ​

 

Comply with technical norms: TU U 25.1-2925223214-004-2022

The product is certified.

The housing is connected to the air ducts with suitable flanges.

The valve plate equipped with sealing ring for gas tightness.

The GK valve can be equipped with a manual (lever or gear) or electric drive.

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Wall Sleeves and Special Flanges for Blast Valves Installation​
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Wall sleeves are the parts to be casted in the concrete walls to allow passage of the air in and out of the shelter. ​

wall sleeves are used in CBRN protected Civil Defense and military shelters for penetra on of blast resistant and gas tight walls while maintaining blast protection and gas tightness.

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