| 摘要 |
<p>A control valve apparatus for determining pressure between a delivery line (18) and a return line (26), and concomitantly, for selectively directing a flow of power fluid at that pressure through a load device (64) from the delivery line (18) to the return line (26). The control valve apparatus comprises sets of first (190), second (194), third (196), and fourth (200) metering ramps sequentially connecting first transverse slots (184) with second transverse slots (186), and then the second transverse slots (186) with third transverse slots (188), for selectively determining pressure between a delivery line (18) and a return line (26) as a function of metering fluid flow therethrough. In addition, the control valve apparatus comprises a similar number of sets of four-way flow control orifice arrays for selectively enabling the flow of power fluid between the delivery line (18) and the return line (26) via the load device (64), which is fluidly coupled across the sets of four-way flow control orifice arrays.</p> |
