Blast valves are devices that mount over the air intake and air outflow pipes in a shelter. They automatically close when a high pressure wave and then the subsequent vacuum wave from a nearby detonation hits your shelter. Without blast valve protection, high pressure air will be forced through the air intake and outflow pipes into your shelter - damaging equipment, injuring or killing occupants, and delivering airborne toxins into your protected space.

Overpressure valves work with the air filter to create and maintain overpressure in your shelter. The A 803 overpressure blast valve integrates both the blast and overpressure valve in one unit.

Gas tight valves allow you to completely isolate your shelter from the outside air.

Blast Valves

Blast valve

Part number: E 1210 Pressure rating: 42 PSI incidence/154 PSI reflective Airflow: 295 - 2,000 CMH Price: $1,165.00 each - plus shipping Notes: Specifications (PDF) Heavy duty blast valve with high pressure rating and airflow. Installation is recommended with 8 inch wall sleeve - see below.

Wall sleeve

Part number: Wall sleeve Diameter: ~8 inches OD (219 mm) Airflow: 295 - 2,000 CMH Price: $1,165.00 each - plus shipping Notes: Specifications (PDF) These sleeves are poured in place in a concrete wall to anchor the blast valves that are mounted to the flange after the wall has cured.

High temperature Blast valve

Part number: RV 50 Pressure rating: 560 PSI Price: $1,635.00 each - plus shipping Notes: Specifications (PDF) Designed to be installed in a 2 inch (~50mm) exhaust pipe of an engine or generator. All stainless steel construction with a temperature rating in excess of 750 F (~400 Celsius).

High temperature Blast valve

Part number: RV 100 Pressure rating: 560 PSI Price: $3,865.00 each - plus shipping Notes: Specifications (PDF) Designed to be installed in a 4 inch (~100mm) exhaust pipe of an engine or generator. All stainless steel construction with a temperature rating in excess of 750 F (~400 Celsius).

Overpressure blast valve

Part number: A 803 Pressure rating: 42 PSI incidence/154 PSI reflective Airflow: 200 - 800 CMH Price: $1,190.00 each - plus shipping Notes: Specifications (PDF) Heavy duty blast valve with high pressure rating and airflow. Installation is recommended with 8 inch wall sleeve - see below.

Overpressure Valve

Overpressure valve

Part number: Z 500 D Pressure rating: not rated for blast protection Airflow: 0 - 1,000 CMH Price: $495.00 each - plus shipping Notes: Specifications (PDF) This valve will regulate the outflow of air from your protected space. It also acts as a check valve - not letting air in.

Gas Tight Valves

Gas tight valves

Part number: PPV 80 I - PPV 400 I Pressure rating: 560 PSI Price: $1,635.00 each - plus shipping Notes: Specifications (PDF) Designed to be installed in a 2 inch (~50mm) exhaust pipe of an engine or generator. All stainless steel construction with a temperature rating in excess of 750 F (~400 Celsius).

When large amounts of air have to be moved through a shelter, it is common to install an array of blast valves: