| 20090032129 | AUTOMATIC FOUR-PORT SELECTOR VALVE - 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 ( | 02-05-2009 |
