Tætningsring til brugsvandventiler

A seal ring is used in combination with a pair of substantially planar, confronting, and substantially parallel faces one of which is formed with an annular groove surrounding a pressurizable chamber and having inner and outer flanks extending transverse to the respective plate face. These faces are relatively slidable and can be formed on a valve plate and a control plate of a single-control valve. The ring is formed with an outer edge normally engaging outward against the outer flank of the groove, an inwardly projecting ridge defining an inner edge normally engaging inward against the inner flank of the groove, and a pair of lips flanking the ridge and each defining therewith an inwardly open groove. Each lip has an outer end lying outward of the inner edge and inward of the outer edge.