| 摘要 |
A valve device (1) for supplying two different flow rates of a gaseous fluid comprises a tubular body (8) provided with an internal cavity (11, 12), an inlet opening (40) for the fluid flowing into the cavity (11), an outlet opening (57) for the fluid coming out of the cavity (11), a connecting path (35, 32, 33, 32a, 30) formed in the cavity (11) between the inlet opening (40) and the outlet opening (57), as well as means for varying the cross-section for the flow of the fluid in the connecting path. The means comprise a first calibrator element (38) which can be inserted in and removed from a first portion (35) of the connecting path, as well as a second calibrator element (55) which can be inserted in and removed from a second portion (30) of the path, the first and second calibrator elements (38, 55) being able to vary the cross-section for the flow of the fluid by means of electromagnetic control members (19, 20) controlled by a control unit (67), the second connecting path portion (30) being in series with the first path portion (35), according to the direction of flow of the fluid.
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