| 摘要 |
<p>A compensated direction-flow control valve arrangement provided with a direction control spool (19) for control of fluid flow to and from a fluid motor (11), which may be of a cylinder type and is subjected to positive and negative loads. During control of negative load the upstream of the outflow metering orifice (110), positioned at the outlet of the fluid motor (11), is maintained at a controlled constant pressure level by a pressure reducing valve (47) handling the fluid flow at negative load pressure. The outflow metering orifice (110) is made independent of the direction control spool (19) and its effective flow area is made responsive and varies with the pressure at the inlet of the fluid motor (11). The pressure differential across a metering orifice (35/36), positioned at the inlet of the fluid motor, is maintained at a constant preselected level by the positive load compensator (12).</p> |
