| 摘要 |
<p>A valve for adjusting the flow-rate of fluids, particularly refrigeration fluids, which is servo-controlled by means of an electric motor (11), of the type that comprises, within a hermetic enclosure capsule (12) and supported rotatably with means for reducing rotary friction, the rotor component (13) of the electric motor with a screw-and-nut coupling (14) with a flow control element (15) which is restrained so as to perform only axial translational motions in a valve body (16) provided with intake and discharge ports (17, 18), the valve body (16) being fixed coaxially to the capsule (12). The means for reducing rotary friction, provided by means of a radial bearing (19), are associated with the rotor component (13) in such a position as to affect the portion (13a) of the rotor component (13) inside which the screw-and-nut coupling (14) is provided.</p> |
