| 摘要 |
The drive (70) has drive pistons (74,78) that are provided in valve housing (2). The pressure medium chambers (84,88) are provided in valve housing for creation of partial open positions. The drive piston (74) is moved from closed position to partially open position against open position, so that valve (1) is operated using one spool (3) and one seat plate (4) at one configuration of drive. The drive piston (78) is moved from closed position to partially open position toward open position, so that valve is operated using seat plate at other configuration of drive. |
