| 摘要 |
<p>1373339 Valves CROSS MFG Inc 9 July 1973 [20 July 1972] 32649/73 Heading F2V A valve assembly for controlling fluid flow to a series of independently actuated hydraulic motors 60a, 60b, 60c comprises control spools 66a, 66b, 66c of the open centre type having common inlets 44 and common outlets 40, the control spool 66a having regenerative circuitry including check valve 144 so that should the piston of the motor 60a descend faster than the inlet fluid enters the upper working chamber, the two working chambers are interconnected and the outlet is blocked, the assembly further comprising a pressure responsive member 86 which maintains a constant pressure drop across the spool 66a regardless of the position of the spool or load on the motor but which moves, when the pressure of inlet fluid falls to a given value in chamber 98, under the bias of spring 90 to the position shown in Fig. 2 to block the outlet 40.</p> |
