| 摘要 |
PURPOSE:To automatically hold the neutral position of the driving valve and static valve of a high tone generating part of a high tone pressure acoustic converter applied to an acoustic test of aircraft, etc. CONSTITUTION:The static valve 2 which is formed into a cylindrical shape and has plural slits 9 on its peripheral surface is fixed into a housing having an aperture. The driving valve 1 arranging slits 11 in the positions half superposed on the slits 9 is arranged in proximity on this peripheral surface. A spacer 3 holds the driving valve 1 at the neutral position and the upper part in the housing 16 is provided with a pressure regulating chamber 4 by a sealing member 15. Pressure is regulated by means of a pressure regulating valve 5. A displacement sensor 6 detects the displacement of the neutral position when the neutral position moves. This displacement is inputted to an automatic controller 17. This controller 17 changes the pressure of the pressure regulating chamber 4 by controlling the pressure regulating valve 5 to suppress the fluctuation of the driving valve 1 so as to automatically maintain the neutral position. |
