| 摘要 |
<p>An automatic, hydraulically actuated, sequencing valve 25 for use with a pair of hydraulic actuators (e.g. double acting hydraulic cylinders) includes a valve body 40 having a cylindrical bore 45 therein. Cam members 49 and 50 at either end of the bore are engaged by pins 62, 63 on the ends of a cylindrical spool 47, thereby rotating the spool 30 degrees each time it engages one of the cam members. A third cam member 78 incorporated into the spool alternately locks open one of a pair of check valves 57, 59 as said spool is pressure shifted between the two bore cam members. The third cam member operates a locking system which permits only one of the two hydraulic cylinders to operate at a time and in sequence.</p> |
