Abstract An incorporation of ΔS = − ΔQ decays into the theory of weak interactions is discussed. To this end, a model of weak interactions is proposed on the assumption of intermediate vector boson fields of a particular kind. The fields represent two sets of positive, negative, and neutral charged bosons, the two sets being hermitian conjugates. The weak currents coupled to the fields are derived from the invariance of the weak interactions under two sets of gauge transformations, each set forming a Lie group of rank 1 and order 3. Various predictions of the model are consistent with experiment and further ways to test the model are discussed.