| 摘要 |
A directional valve for controlling an actuator by means of pressurized medium, the directional valve comprising: a spool (4) fitted to move axially inside the directional valve; a first position of the spool (4), in which the spool tends to be set; and a second position of the spool (4), to which the spool can be moved by a pilot control force. In addition to the functions of a directional valve, the directional valve comprises a metering orifice (7) placed in the pressure port (P) or in the first work port (A) or in the second work port (B) or in the tank port (T), and across which a pressure difference is effective. The spool (4) further comprises a second position, to which the spool can be moved by a pilot control force. When the spool (4) is in at least the second position, the directional valve is fitted to generate a compensating force proportional to said pressure difference, to move the spool (4) to compensate for the flow. |
