| 摘要 |
<p>The invention relates to a control valve for selectively placing under pressure or in a depression an environment or a container, comprising: an inlet opening (2), predisposed for connecting with a source of a pressurised fluid; a connecting conduit (3) predisposed for connecting with an environment to be pressurised or de-pressurised; a venturi tube (4, 5, 6), provided with an inlet section (4), an outlet section (5) and a gully section (6); a shaped obturator (7), mobile between a central position, in which the inlet opening (2) and the connecting opening (3) are closed, a pressurised position, in which the inlet opening (2) is set in communication with the connection opening (3), and a depressed position, in which the inlet opening (2) is set in communication with the inlet section (4) and the connecting conduit (3) is set in communication with the gully section (6) of the venturi tube (4, 5, 6). The invention also relates to a device for filling or emptying a container, comprising the control valve, and a closing device for a container, comprising a lid (102) and the device for filling or emptying a container.</p> |
