| 摘要 |
<p>An ON/OFF valve ( 1,1',1'' ) that has an outer body ( 3 ) defining a fluid flow cavity ( 2 ) divided by an intermediate surface ( 8, 21 ) into a first and a second chamber ( 2 a, 2 b) communicating with each other via an opening section ( 6, 28 ) in the intermediate surface ( 8, 21 ). A flexible shutter ( 7 ) has on the side facing the first chamber ( 2 a), a membrane portion ( 17 ) that cooperates elastically, by virtue of a fluid pressure, with the intermediate surface ( 8, 21 ) and with the opening section ( 6, 28 ) to separate the first and second chamber ( 2 a, 2 b) hermetica1ly. Fluid leakage generating members ( 20, 27 ) are located between the membrane portion ( 17 ) of the shutter ( 7 ) and the opening section ( 6, 28 ), and are active when the pressure in the first chamber ( 2 a) exceeds the pressure in the second chamber ( 2 b) by an amount equal to or less than a threshold value (P) other than zero.</p> |
