Bypass Valve (Return) - Bypass Check Valve
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| 图 1 | g00847520 |
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主控制阀室（回油回路） (5) 补给管（流向回转马达的补充机油） (10) 主控制阀 (17) 低速回油单向阀 (29) 液压油冷却器 ( 18)的进口油管 | |
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| 图 2 | g01234594 |
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低速回油单向阀和旁通单向阀 (5) 补给管（流向回转马达的补充机油） (16) 回油管 (17) 低速回油单向阀 (24) 旁通单向阀 (28) 单向阀 (29) 液压油冷却器 ( 18)的进口油管 (30) 旁通单向阀回油管 (33) 回油管（流向回油滤清器的回油流） | |
流过低速回油单向阀 ( 17) 的回油流量分流到两条流路。 部分机油经过进口油管 ( 29) 流向液压油冷却器，其余的回油流过旁通单向阀 ( 24)。
当进口油管 (29) 中的回油温度很低时，机油粘度很大。 进口油管 (29) 中的回油流动阻力很高。 因此，回油的压力很高。
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| 图 3 | g00849905 |
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(19) 回油滤清器
(25) 液压油箱 (33) 回油管 | |
由于回油的压力很高，旁通单向阀 ( 24) 打开。 大部分回油经过旁通单向阀 ( 24)、回油管 (33) 和回油滤清器 ( 19)，流向液压油箱 ( 25)。 其余的机油经过进口油管 ( 29) 流向液压油冷却器。 由于少量回油流向机油冷却器，因此机油温度升高。
机油温度升高后，回油压力降低。 旁通单向阀 (24) 开始关闭。 更多的回油流向液压油冷却器。 旁通单向阀 (24) 将液压油保持在最适宜的工作温度。
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