| 摘要 |
<p>An hydraulic valve assembly comprising an inlet (31) for connection to a source of pressure fluid, a number of subsidiary valves (43, 44) supplied from the inlet (31) and an outlet (32) for the return of fluid from the assembly to tank, and a pair of electro-hydraulic proportional load and pressure compensated cartridge valves (36, 37) to enable proportional control of fluid entering and leaving the assembly. The invention enables increased levels of control to actuators connected to the subsidiary valves, at reduced cost and in a more compact assembly when compared with conventional valve assemblies in which separate proportional control valves are required for each subsidiary valve and each requires a separate electronic channel for its operation. A valve (47) enables a float condition to be achieved on an actuator connected to service ports (41) and (42). <IMAGE></p> |
