| 摘要 |
A device for double-acting hydraulic systems with a slave cylinder (1) and a master cylinder (72) whose piston (76) can be moved to a position, wherein fluid can flow both ways between a master cylinder space (73, 74) and a reservoir (92) for hydraulic fluid. For each slave cylinder space the slave cylinder (1) has a vent nipple boring (12, 22) with an internal section (16, 26), i.e. a section located near the cylinder space (2), which is in the form of a seat. A first end section (41, 51) of a vent nipple (40, 50) with a through-going nipple channel (60) can abut sealingly against the seat and thereby close the nipple boring (12, 22) when the nipples (40, 50) are screwed completely into the nipple borings (12, 22). The hydraulic system can be connected to an evacuation device. An external section (19, 29) of the nipple borings (12, 22) is arranged to slidably and sealingly abut against the second end section (44, 54) of the nipples (40, 50) both when the first end section (41, 51) of these closes and opens the nipple boring (12, 22). A connecting channel (35) provides communication between the nipple borings (12, 22). Furthermore the nipple channel (60) cooperates with a device (63) which prevents fluid flow from the second end section of the nipple towards the first.
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