| 摘要 |
A hydraulic system comprising a fixed displacement pump (10) driven by a prime mover operable at variable speeds and a flow control valve (18) operable to return a portion of the hydraulic fluid from the outlet of the pump (10) to the inle (17) of the pump (10) and draw fluid from a reservoir (14) to replenish the fluid at the inlet (17) when the pump (10) is operated at higher speeds. An auxiliary passage (26, 27) extends from the reservoir (14) and communicates with the inlet (17) of the pump (10) upstream from the system flow drawn from the reservoir (14) by the opening of the flow control valve (18) and normally isolated during low speed operation from the bypass flow (25) by the flow control valve (18, 21) thereby providing auxiliary flow to the inlet (17) at lower speeds.
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