Emergency Quick Release Valve

This is why Freudenberg Sealing Technologies launched series production of “DIAvent®” in early 2020, to offer a ventilation valve that combines regular housing venting and rapid emergency degassing in a single component. Now the supplier is presenting a new generation of this valve, which makes the emergency degassing four times faster. Even with an overpressure of 300 millibar inside the housing, “DIAvent® Highflow” already enables a flow rate of 92 liters per second.

The basic design of the valve stays the same: A centrally positioned, water-repellent nonwoven element ensures effective air exchange during normal operation. If water hits the valve at high pressure, the outer layer is temporarily pressed onto a completely media-tight interior layer, preventing any water from penetrating the housing. Emergency degassing is enabled by a ring-shaped umbrella valve surrounding the nonwoven membrane. It reliably opens as soon as the pressure inside the housing exceeds the atmospheric air pressure by more than 40 millibar. After the pressure is equalized, the reversible umbrella membrane closes again and restores the water tightness.

The significantly enhanced performance of the valve, whose outside dimensions remain nearly unchanged, can be attributed to the optimized gas flow inside the component. Engineers at Freudenberg Sealing Technologies have calculated the flow-through of the valve in detail for this purpose. Minor geometric changes, such as additional openings on the sides of the umbrella, prevent air from accumulating under the screen and enable a significantly increased flow rate.