| 摘要 |
<p>A flow control valve is used with a hydraulic cylinder having a reciprocable piston and a rod connected thereto. The valve includes a valving spool which defines a relatively stable center position blocking off hydraulic fluid flow to the rod end of the cylinder, but not interfering with the flow to the head end of the cylinder. Upon application of pressurized hydraulic fluid to the valve through a line connected to the valve, the valving spool shifts in one direction to allow fluid flow to the rod end of the cylinder, retracting the rod. Upon application of fluid pressure to the head end of the cylinder, the valving spool shifts in the other direction to allow open communication between the rod end and the head end of the cylinder, so that fluid flows from the rod end to the head end of the cylinder, resulting in a super-charged condition at the head end of the cylinder and consequent rapid extension of the rod.</p> |
