US Patent 7846239 Automatic four-port selector valve

An automatic selector valve including a box body having an internal space portion, framed partition plates separating the space portion into four rooms, each framed partition plate having an opening portion, plate-shaped turnable valve bodies opening or closing the opening portions of the framed partition plates, an inflow port letting a gas flow in, an inflow/outflow port letting a gas flow in and flow out alternately, an outflow port letting a gas flow out through, and an inflow/outflow port letting a gas flow in and flow out alternately with the port, the ports provided in the separated four rooms, and a driving mechanism turning the plate-shaped turnable valve bodies about a rotation shaft.