| 摘要 |
<p>An anti-syphoning valve (12) which is suitable especially for incorporation into sanitary fittings comprises, in a housing (1), a chamber (10) into which a water inlet conduit (9), a water outlet conduit (8) and a ventilation channel lead. A resilient closing flap (16) comprises a fastening portion (18) and a closing portion (19) connected hinge-like thereto. Normally, that is, provided there is no negative pressure in the inlet conduit, the closing portion covers the opening of the ventilation channel leading into the chamber, so that, on the one hand, no atmospheric air can enter and, on the other hand, no water can escape. If, however, a negative pressure arises in the pipe system connected to the inlet conduit, the closing portion of the closing flap pivots through a certain angle until it seals the inlet point of the conduit leading into the chamber and, on the other hand, frees the ventilation channel to the chamber. In this way, no more water can flow back into the inlet conduit and to the pipe system connected thereto; on the other hand, the water passages downstream of the chamber are ventilated. The sucking back of contaminated water into the drinking-water system which is connected to the inlet conduit is thereby reliably prevented. The anti-siphoning valve is of such small construction that it can be accommodated especially in the bottom region of known sanitary fittings. …<IMAGE>… </p> |
