As a precision valve, it reacts immediately to changes in pressure in the line. “Due to the rubber membrane of the DallVent WE, which rises from the valve cover when the vacuum develops (min. 250 Pa), ambient air flows into the drainage pipe and thus ensures pressure equalisation,” says Diekämper. Like the DallVent Maxi and DallVent Mini, the DallVent WE works on the principle of gravity. Also, it is essential that an air-admittance valve is installed vertically, otherwise the rubber membrane will not fit properly on the valve cover and sewer gases would escape, essentially rendering the valve useless, Diekämper further explains.  

The DallVent WE can be easily integrated into the front wall and, thanks to its oval shape, is ideal for low-profile walls. Once attached the air-admittance valve provides for the immediate reduction of negative pressure in the drainage system. Using a push-in socket system the DallVent WE can be easily installed, and it can also be connected directly to DN 50 and DN 70 wastewater pipes. “During assembly, the variably cut-to-length red wall-mounted housing is a real benefit for installers, because it enables them to react to almost any installation situation and install the air-admittance valve,” explains Diekämper. In contrast to other commercially available air-admittance valves on the market an additional advantage of the DallVent WE is that it can be completely dismantled thanks to its plug-in socket system and, as an inspection opening, offers further access for maintenance and cleaning of pipes.

Cleaning the valve is even easier for the user, since the cover and valve insert – including the membrane – can be removed in a few steps without any tools. Thus, the DallVent WE is easy to clean under running water and then reinserted. In addition to its sophisticated technology, the DallVent WE scores with its elegant looks. “When developing the air-admittance valve, it was important to us that it looks great and at the same time takes up as little space as possible, ” Diekämper says. These advantages also won over the planners and architects of the Phoenix See residences in Dortmund where the stepped design of the individual storeys made it a tricky task to ventilate the sanitation pipe system of the modern residential houses. Yet, DallVent WE offered the ideal solution to ensure the necessary ventilation in the complex pipe systems. In addition, the appealing look with covers in chrome-plated plastic and white ensure a harmonious bathroom design in the aesthetic buildings.