Ustroystvo pereklyuchayushchee ustanavlivaetsya v tekh sluchayakh, kogda po usloviyam raboty mozhet vozniknut' neobkhodimost' otklyucheniya odnogo predokhranitel'nogo klapana i odnovremenno, bez ostanovki rabochego protsessa, podklyucheniya drugogo, a takzhe dlya izmeneniya napravleniya potoka rabochey sredy po truboprovodam ili smeshivaniya potokov sredy.
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