In the event of differences in pressure, a valve element opens upwards (overpressure) or downwards (vacuum). With increasing difference in pressure, the valve cover opens gradually and closes automatically when pressure equalisation has taken place.

Under equalised pressure, the all-around seals on the valve cover guarantee that no pumping/storage medium gets into the atmosphere and no humidity can get into the container system. The cross-section of pressure equalisation opening required depends on several factors and must be defined when designing the venting concept for the respective application.

In the case of pressure relief, it must be taken into account that there may be an emission of dust, air, or gas, whereby this effect may cover a more or less large area.

Standard design: hot-dip galvanized
Optional: stainless steel, e. g. for chemical industry
Generation: G1 and G2
Size: DN250 and DN800