320 GC, 320 and 323 Excavator Machine Systems Caterpillar


Check Valve (Return Makeup)

Usage:

320 GC BR4


图 1g06203681
主控制阀回油回路
(1) 液压油冷却器
(2) 至机油冷却器进口的管
(3) 主控制阀
(4) 回转马达
(5) 补给管(流向回转马达的补充机油)
(6) 液压油箱
(7) 至液压油箱的回油管
(8) 回油单向阀
(9) 来自机油冷却器出口的管


图 2g06203697
回油单向阀
(A) 来自主控制阀
(B) 至液压油冷却器
(C) 自液压油冷却器
(D) 至液压油箱
(10) 旁通单向阀
(11) 回油单向阀

回油单向阀 (8) 由两个单向阀组成:回油单向阀 (11) 和旁通单向阀 (10)。 回油单向阀 (11) 位于回油回路主控制阀和液压油箱之间。 回油单向阀限制回油流量。 此限制导致主控制阀内的回油通道压力升高。 补偿管路 (5) 与此回油通道直接相连。

如果回转马达出现气穴,主控制阀回油通道内的机油流入补偿管路 (5)。 这部分补偿油供至回转马达进口,以防止回转马达出现气穴。

注: 有关补给操作的更多信息,请参阅系统操作, "机油补偿(回转系统)"。

流过回油单向阀的回油分流到两条流路。 一部分回油流经端口 (B) 进入液压油冷却器 (1)。 流出液压油冷却器的机油流量流入端口 (C) 并经过端口 (D) 进入液压油箱中的回油滤清器。 其余回油流经旁通单向阀 (10)。

当回油的温度很低时,油的粘度很高。 机油厚度导致冷却器 (1) 内的阻力较大。 因此,端口 (B) 中的机油压力高。

由于回油的压力很高,旁通单向阀 (10) 打开。 大部分回油流经旁通单向阀和端口 (D) 进入液压油箱中的回油滤清器。 其余的机油流经端口 (B) 进入液压油冷却器。 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 (10) 开始关闭。 更多的回油流向液压油冷却器。 旁通单向阀 (10) 将液压油保持在最适宜的工作温度。

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