BVNO series valves are blast valves which are normally open and close immediately when a blast wave acts upon it. They are designed to allow the air from outside to be sucked into the shelter area with lowest resistance of air and to avoid penetration of the blast wave. These valves can also be used to discharge air with least possible pressure drop through a protected area where maintainig over pressure inside is not required. The blast valves are to be installed on the external walls of the protected space
BVNC series valves are blast valves which are normally closed and open to release air from the protected space maintaining the required overpressure. They are designed to avoid penetration of the blast wave from outside into the protected space. These valves are to be installed on the external walls of the protected space
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.