STEAM STERILIZATION AUTOMATIC ON-OFF VALVE FOR HIGH PRESSURE FLUID CIRCUIT AND STERILIZATION DEVICE WITH THE VALVE

PROBLEM TO BE SOLVED: To provide a steam sterilization automatic on-off valve device for a high pressure fluid circuit capable of changing-over between a high pressure processing and an automatic steam sterilization processing.SOLUTION: There are provided a stepped piston 11 with a large-diameter piston part 12 and a small-diameter piston part 13; a stepped cylinder 16 having a large diameter cylinder part 14 in which the large-diameter piston part 12 of the stepped piston 11 is slidably inserted in it and a small-diameter cylinder part 15 in which the small-diameter piston part 13 is slidably inserted in it; and a piston reciprocating means 20 for reciprocating the stepped piston 11 inserted into the stepped cylinder 16. The upper end of the small-diameter cylinder part 15 has a communication hole 31 communicated with a flow passage from a high pressure fluid circuit 30. The small-diameter piston part 13 has a closing piece 21 for closing the communication hole 31 when the stepped piston 11 slides toward the small-diameter piston part 13 and in turn for releasing the communication hole 31 when the stepped piston 11 slides toward the large-diameter piston part 12. 【課題】高圧処理−自動蒸気滅菌処理とを切り替えられる高圧流体回路用蒸気滅菌自動オンオフバルブ装置を得る。【解決手段】大径ピストン部１２及び小径ピストン部１３を有する段付きピストン１１と、段付ピストン１１の大径ピストン部１２が内部に摺動可能に挿入される大径シリンダ部１４及び小径ピストン部１３が内部に摺動可能に挿入される小径シリンダ部１５を有する段付きシリンダ１６と、段付きシリンダ１６内に挿入された段付きピストン１１を往復動させるピストン往復動手段２０とを備え、小径シリンダ部１５の上端には高圧流体回路３０からの流路に連通する連通孔３１を有し、段付きピストン１１が小径ピストン部１３方向に摺動した際に連通孔３１を閉塞し、段付きピストン１１が大径ピストン部１２方向に摺動した際に連通孔３１を開放する閉塞片２１が小径ピストン部１３上に形成されているもの。【選択図】図１