| 摘要 |
<p>A servovalve comprises an electric motor 12, a distributor valve 14 integrating a hydraulic slide which is controlled by the motor 12. The slide has two channels 62, 64 in a rod 30 and six blocks 32 to 42 are mounted for cooperating with one another and with ends of the slide to define seven annular chambers 44 to 56 which communicate with five orifices 66 to 74 in addition to pilot orifices 58, 60. Chambers 50, 54 communicate with adjacent load chambers 48, 52 and load channels 62, 64 which communicate with load orifices 68, 72 which are connected to a receiver member 16. Block 40 may be provided with two annular drain grooves (76a, 76b, fig 6) which communicate with a third load channel. The rod may also be provided with eight blocks forming nine chambers and seven orifices in addition to two pilot orifices (fig 7).</p> |
