| 摘要 |
<p>Generic type of the invention: pilot-controlled hydraulic valve for changing over the valve input pressure (p1) between a working pressure value and a lower circulating pressure value, in particular a pressure limiting valve. A main flow path is provided here with inlet (16) and outlet (17), a main valve (HV) arranged in the main flow path and a pilot control valve (VV1) operatively connected to the main valve. The main valve (HV) is provided with a resiliently elastic reset element (6). Object of the invention: production of a valve of the abovementioned type which is distinguished by a low circulating pressure with nonetheless high operational reliability, even for relatively high working pressures and relatively large flows. Achieving the object: in conjunction with the features of the generic type, provision is made of a relieving device (EV) which can be activated by the pilot control valve (VV1), is operatively connected to the reset element (6) and controls the resetting effect on the main valve (HV). Furthermore, the relieving device (EV) is designed such that it can be changed over, under the effect of the pilot control valve (VV1), between an activated position with a reduced effect of the reset element (6) on the main valve (HV) and a deactivated position with increased effect of the reset element on the main valve. <IMAGE></p> |
