| 摘要 |
<p>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) cause displacement of the spools (10,10R,10L) when pilot pressure is applied. A flapper mechanism consists 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> |
