| 摘要 |
<p>PURPOSE:To selectively join two flows by switching one switching valve by opening and closing an unload valve to selectively join fluid of one fluid pump with fluid of the other fluid pump. CONSTITUTION:When respective switching valves 5, 6, 8 are located at a neutral position, fluid from the first fluid pump 1 is unloaded under substantially zero by opening an unload valve 13. Fluid from the second fluid pump 2 is by-passed under low pressure equal to spring pressure PS2 from a by-pass valve 14, so that while power loss at the neutral position is reduced, two flows can be selectively joined by switching one winding switching valve 8.</p> |
