| 摘要 |
<p>A valve device for regulating the flow-rate of a gaseous fluid comprises a tubular body (8) provided with an internal cavity (11), an inlet opening (40), an outlet opening (25), a connecting path (35,32,33) formed in the cavity (11), as well as a calibrator element (38) which can be inserted in and removed from a portion (35) of the connecting path and which can vary the cross-section thereof for the flow of the fluid by means of control members that are controlled by a control unit (61). The control members comprise a coil (19) with a respective ferromagnetic core (20). The connecting path is formed at least partly in the electromagnet core (20) which is movable inside the cavity (11). The calibrator element (38) is positioned in the part (35) of the connecting path which is formed in the core (20), the core being movable relative to the calibrator element (38) between a first position and a second position as a result of the activation and de-activation of the coil (19), determining respective cross-sections for the flow of the fluid, each having a respective area value.</p> |
