| 摘要 |
A hydraulic circuit (1) that comprises at least one actuator (2) connected to a bed or footboard, a main line (4) for the fluid, a pilot line (6) and a lock valve (8), gauged at a first level of pressure, set upstream of each actuator (2), a distributor (16) and a main lock valve (12), gauged at a second level of pressure greater than the first level of pressure to allow the reflux of the work fluid from the main line for the lowering of the bed or footboard.
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