| 摘要 |
The control circuit operates two double-action hydraulic jacks and comprises a distributor with two hydraulic fluid generator ports and two pairs of ports for the two jacks. The distributor has only one valve slide, the transmission of hydraulic pressure into one of the two connection ports causing a four stage cycle of movement. The control circuit operates two double-action hydraulic jacks and comprises a distributor with two ports for connection to a hydraulic fluid generator, and two pairs of ports for supply of each of the chambers of the two jacks. The distributor has only one valve slide, the transmission of hydraulic pressure into one of the two connection ports causing a four stage cycle of movement. The four stages comprise the output of the slide (43) of the second valve (41) whilst the slide (42) of the first valve (38) is held out; the re-entry of the slide of the first valve whilst the slide of the second valve remains out; output of the slide of the first valve whilst the shaft of the second valve remains out; and re-entry of the slide of the second valve whilst the slide of the first valve remains out. |
