摘要 |
<p>This invention relates to a hydraulic servo valve comprising spools (10, 10R, 10L) which undergo displacement inside a valve body (1), switch the direction of an operating fluid and change its flow rate; nozzle back-pressure chambers (18, 18R, 18L) to which a pilot pressure for causing displacement of the spools (10, 10R, 10L) is applied; and a flapper mechanism consisting of nozzles (19, 19R, 19L) and flappers (20, 20R, 20L). Static pressure bearings (14R, 14L, 141R, 141L, 142R, 142L) are formed at both ends of the spools (10, 10R, 10L) so as to define the passage of the operating fluid extending from a pump port (P) to the nozzle back-pressure chambers (18, 18R, 18L) through the static pressure bearings (14R, 14L, 141R, 141L, 142R, 142L).</p> |