The PVD-50 exhaust and sanitary blast valve is used as exhaust air valve of Civil Defence and military shelters. The PVD-series exhaust and sanitary blast valves are specially designed to be used in the exhaust systems of diesel engines and are suitable for other applications with hot and corrosive gases. The valve is also applied for protection of vent pipes of sanitary systems and fuel and water tanks. When ordering, please mention if the valve is to be used for vent pipe application.