BVNC - Overpressure Blast Valves
Overview
BVNC overpressure valves – normally closed valves designed to maintain or control the differential pressure level in the shelter by releasing the air from the gastight shelter while offering providing protection from external blast wave pressure.
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BVNC overpressure valves were developed for use in civil defence shelters, bunkers, safe rooms and other protected spaces.
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BVNC line of valves includes a wide range of valves for different airflows.
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BVNC are automatic action valves designed to protect from external blast wave pressure.
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BVNC designed for controlled release of air from the shelter when positive pressure (overpressure) rises to required level.
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The valves are extremely durable and can operate in a wide range of temperatures and resistant to corrosion.
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The valves are designed for installation on ventilation openings or as part of the duct.
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Tested and certified to SI 4570 standard and/or compatible with requiernments of other shelter norms
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Approved by civil defence authorities in different countries
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Tens of thousands of company's products are installed in protected spaces
BVNC 40 - Overpressure Blast Valve
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Reflected blast pressure durability (operational): >900 kPa
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Nominal airflow: 40 m3/h
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Pressure drop @ nominal: 200 Pa
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Mechanical shock resistance: >12 g
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Standard flange: 4 Inch
BVNC 300 - Overpressure Blast Valve
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Reflected blast pressure durability (operational): >900 kPa
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Nominal airflow: 300 m3/h
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Pressure drop @ nominal: 200 Pa
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Mechanical shock resistance: >12 g
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Standard flange: 8 Inch
BVNO 600 - Overpressure Blast Valve
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Reflected blast pressure durability (operational): >900 kPa
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Nominal airflow: 600 m3/h
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Pressure drop @ nominal: 200 Pa
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Mechanical shock resistance: >12 g
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Standard flange: 8 Inch
BVNO 1500 - Overpressure Blast Valve
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Reflected blast pressure durability (operational): >900 kPa
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Nominal airflow: 1500 m3/h
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Pressure drop @ nominal: 200 Pa
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Mechanical shock resistance: >12 g
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Standard flange: 8 Inch
BVNO 2100 - Overpressure Blast Valve
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Reflected blast pressure durability (operational): >900 kPa
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Nominal airflow: 2100 m3/h
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Pressure drop @ nominal: 200 Pa
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Mechanical shock resistance: >12 g
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Standard flange: 14 Inch
BVNO 3300 - Overpressure Blast Valve
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Reflected blast pressure durability (operational): >900 kPa
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Nominal airflow: 3300 m3/h
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Pressure drop @ nominal: 200 Pa
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Mechanical shock resistance: >12 g
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Standard flange: 14 Inch
BVNC Blast Valves Series
Preparation for Installation of BVNC Valves
Definitions:
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Air inlet – ventilation opening in the shelter perimeter wall intended for pulling fresh air from outside.
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Air outlet – ventilation opening in the shelter perimeter wall intended for releasing air from the shelter.
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Blast valve – a protective device designed for installation on/in the air inlet for protecting the internal space and the system components from blast wave pressure.
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Overpressure valve – a protective device designed for installation on/in the air outlet for controlled release of air from the shelter and maintenance of overpressure levels in the protected space.
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Flange – devices for connection of air duct or valves.
Wall Sleeve with Flange - for Casting in Concrete Walls
Wall sleeves are hollow pipes which are intended to be casted in shelter concrete walls for allowing passage of air from outside and inside. Wall sleeves are usually connected with flanges on the shelter side to allow simple connection of the blast valve, overpressure valve, gas tight valve, air duct, cable gas tight passages and more.
* wall sleeves are not included in the kit and can be purchased separately.
Retrofit Flange - for Installation with Anchors on Existing Walls
Retrofit flanges designed to allow connection of the blast valves and overpressure valves to existing walls in the perimeter of the shelter/ protected space. The flanges connected to the wall by special concrete anchors and have pre installed bolts for securing the valves with nuts.
* retrofit flanges are not included in the kit and can be purchased separately.
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