| 摘要 |
Provided is an automatic four-port selector valve which is capable of controlling a variation in static pressure and a variation in flow rate induced in the switching of air or gas flow passages so that they are within tolerant accuracies, which is further capable of controlling a saliently appearing variation in pressure difference in a clean temperature-controlled/humidity-controlled air supply apparatus, a dry air supply apparatus, etc., so that it is within tolerant accuracy and which is also improved in airtightness and heat-insulating performance, and the present automatic selector valves includes a box body having a space portion inside it, framed partition plates for separating said space portion into four small rooms, the framed partition plates having an opening portion each, plate-shaped turnable valve bodies for opening or closing the opening portions of said framed partition plates, an inflow port for letting a gas flow in through it in any instance, an inflow/outflow port (1) for letting a gas flow in and flow out through it alternately, an outflow port for letting a gas flow out through it in any instance and an inflow/outflow port (2) for letting a gas flow in and flow out through it alternately with said port, these ports being provided in said separated four small rooms, and a driving means for turning said plate-shaped turnable valve bodies about a rotation shaft.
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