| 摘要 |
The hydraulic drives comprise at least one line (14, 15) which leads to a machine aggregate (16) and which can be connected either to a pump or to a reservoir. When the line is connected to the tank, a holding valve (17) arranged in the line maintains a minimum pressure in the branch of the line leading to the machine aggregate. The actual value of the pressure in the line is measured by a manometer (18) arranged in said line branch. If this value falls below the minimum pressure predetermined by the opening pressure of the holding valve, as determined by a comparator (19), this indicates the presence of a leak, even minute, in the section of the line. |
