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Explosion protection valve
They are used for a pressure resistant closure of air inlets and outlets in shelters for civil defense and other exposed buildings. They protect people and installations against the effect of nuclear and conventional explosions.
The shutting disc is spring mounted inside the casing. On impact of a blast wave the shutting disc is automatically pressed onto the sealing surface in shelter protected direction, to stop the airflow immediately. At the subsequent suction the disc is pressed in opposite direction. The explosion protection valve with air filter (ESV/VF) is fitted with an air filter additionally mounted to the casing. The overpressure/explosion protection valve (UV/ESV) is equipped with an overpressure disc on the shelter protected side, which is used to build up an an overpressure inside the shelter. After decrease of the overpressure respectively the suction pressure the valve automatically resets to normal ventilating operation.
The Andair explosion protection valves are tested by the Armament Technology and Procurement group and approved by the Swiss Federal Office of Civil Defense.
 
 
 
 
Explosion Protection Valve Type FC

Blast Protection
Blast protection is required to shield civil, military and industrial installations from the effects of war terrorism, sabotage and accidental damage where the ventilation airways must be protected to the same level as the building structure. The Andair FC (System Luwa) explosion protection valve has been designed and developed to meet this need. When correctly selected and installed, it will prevent pressure waves generated by conventional, nuclear and FAE weapons penetrating the structure and causing harm to personnel or damage to equipment.

Since the equipment will only be used in emergency conditions and must work first time then it must be of the highest quality Andair's experience, technical know-how and high ethical standards guarantee this quality and so assure the safety and security of the installation with a high performance state of the art product.

Tornado / Hurricane Protection
Only the Andair FC (System Luwa) explosion protection valve has been tested for conditions generated by heavy storms. The valves are closing in the positive and negative pressure phase and protect effectively equipment and persons.

MilitaryApplication
Protection of Military Headquarters, Command Posts, Communication Centres, Avionics, Control Centres, Ammunition Bunkers, Aircraft Hangars, Navy Frigates.

Civil Defence Application
Protection of Underground Hospitals, Switchboard Rooms, Telecom Centres, Transmitters, Test Labs, Water Reservoirs, Disaster Centres, Computer Centres, Cultural Values, Civil Shelters.

Industrial Application
Protection of Refinery Command Centres, Control Rooms, Test Facilities, Production and Assembly Plants.

Design
Due to its rectangular modular design the Andair FC (System Luwa) explosion protection valve can be sized for any airflow and pressure drop. It can be fitted in any Each valve block consists of two identical half shells between which are clamped 6 closing leaves made of high alloy spring steel. This simple design concept with only the one moving part gives extremely short closing times against both long duration nuclear and short duration conventional explosions. Therefore, let through pressure and impulse are extremely small.

The half shells are made from aluminium alloy and both the shells and closing leaves have a war gas proof coating for additional corrosion protection. A special maritime coating is available for installations at the seaside and in aggressive industrial areas. The valves are installed in the various support frames with clamping sets. The end profiles are of anodized aluminium, the other parts of galvanized steel. Once the valves are installed in the frames, the openings can be considered as burglar proof thanks to the special design of the fixing.

Quality Assurance
Shelter components have to meet stringent performance criteria. Obviously blast tests cannot be carried out on completed buildings to prove the effectiveness of the product, so quality and reliability can only be assured by individual product type test together with a strict regime of production quality control. Andair is one of the first companies in this field, world-wide, to be independently assessed and certified to EN ISO 9001.

Specification
Explosion protection valve Type FC
(System Luwa)
Made by Andair Ltd.,
CH-8450 Andelfingen
Design according to the directives of the Swiss Federal Office of Civil Defence (BZS).
Type tested and approved by the Swiss Defence Procurement Agency.
Approval No. BZS T 67-014 Drawing N0.1.02.861 .1/2/3/4 consisting of:
- valve blocks made of aluminium alloy and closing leaves made of high alloy spring steel, all with war gas resistant surface treatment, clamping end sets made of anodized aluminium and clamping mid sets of galvanized steel.

Prefilter Type PF-FC

Application
Andair prefilters PF-FC (System Luwa) are installed behind FC blast valves. They protect downstream components in ventilation system from coarse dust contamination.

Design
The prefilters PF-FC (System Luwa) exactly match the size of the FC blast valve. They are strong enough to withstand the let through pressure of the blast valve. The prefilters can be easily fixed onto the clamping bar of the blast valve.

Each prefilter consists of a sheet metal casing, an inner and outer mesh grille with a filter mat in between. All steel parts have wargas proof coating for corrosion protection. The filter mat is made of polyester fibres and can be changed without tools. The mat can be dry cleaned.

Quality Assurance
Shelter components have to meet stringent performance criteria. Obviously blast tests cannot be carried out on completed buildings to prove the effectiveness of the product, so quality and reliability can only be assured by individual product type test together with a strict regime of production quality control. Andair is one of the first companies in this field, world-wide, to be independently assessed and certified to EN ISO 9001.

Specification
PrefilterType PF-FC
(System Luwa)
Made byAndair Ltd.,
CH-84soAndelfingen
Design according to the directives of the Swiss Federal Office of Civil Defence (BZS).
Type tested and approved by the Swiss Defence ProcurementAgency.
Approval No. BZS T 90-002 Drawing No. 1.02.862.1/2 consisting of:
- filter casing made of sheet steel
- surface protection: powder coating according to BZS requirements
- filter mat made of polyester fibres

Performances
- Strong construction to withstand let through pressure/impulse of valve
- Separation efficiency: 85% according to ASHRAE 52-76 (gravimetric test)
- Dust holding capacity: 20 g per 100 mvh (ASHRAE test dust)
- Filter mat for dry cleaning - Shock resistance: acceleration 16 g, velocity 1,6 m/s
- Wargas proof surface treatment
- Excellent corrosion protection under normal atmospheric conditions
- Maximum permanentoperation temperature 130 OC. (For short time higher).