422F2, 427F2, 426F2, 428F2, 432F2, 434F2 and 444F2 Backhoe Loaders Hydraulic and Steering System Caterpillar


Priority Valve - Inlet Manifold of the Loader

Usage:

426 F2 DJ4



图 1g02990097

(1) 安全阀

(2) 优先阀

(3) 信号端口

(4) 转向端口

(5) 泵端口

(6) 油箱端口

(7) 腔室

(8) 滑阀

(9) 弹簧

(10) 腔室

(11) LS 排放调节器

(12) 转向排放负载感应端口

进口歧管通过螺栓固定到装载机控制阀组上的提升控制阀上。 安全阀 (1) 和优先阀 (2) 安装在装载机控制阀组中。 安全阀防止液压系统负载信号回路中的机油压力变得过高。 流经安全阀的负载信号油流出进口歧管,经端口 (6) 流向油箱。 端口带有 "T" 标记。

来自液压泵的油流过端口 (5) 。 端口带有 "P" 标记。 至计量泵的供油流出端口 (4) 。 端口带有 "D" 标记。 负载信号油从端口 (3) 流向反铲阀组。 端口带有 "LS" 标记。 来自装载机控制阀组回路的回油经端口 (6) 流向油箱。 端口带有 "T" 标记。

油通过端口 (5) 进入优先阀。 弹簧 (9) 保持滑阀 (8) 升起,防止油流向装载机控制阀组中的控制阀。 油环绕滑阀流动后流入腔室 (7) 。 油经过端口 (4) 流向转向回路。 部分油流向切入滑阀的腔室。 油处于腔室 (7) 和 (10) 中的滑阀内和滑阀端部。

随着油流入转向回路,优先阀中的油压升高。 当油压克服弹簧 (9) 的力时,滑阀 (8) 向下移动。 油环绕滑阀流动后流向腔室 (10) 。 随后,油流向装载机控制阀组中的控制阀。

当方向盘转动时,计量泵需要更多的油。 计量泵导致计量泵腔室 (7) 中的压力降低。 此压力降低可在腔室 (10) 中感应到。 切入滑阀的腔室允许油从腔室 (10) 流向腔室 (7) ,降低腔室 (10) 中的油压。 弹簧 (9) 将促使优先滑阀 (8) 向上移动。 优先滑阀向上移动时,滑阀减少流至装载机控制阀组的机油流量。 该操作将更多的泵供油引至计量泵。

装载机进口歧管包含负载信号油安全阀 (1) 。 装载机进口歧管的内部腔室连通来自控制阀的负载信号油与来自转向回路的负载信号油。 连通这些回路允许压力最高的回路控制来自泵的油流。 如果信号油回路中的油压过高,安全阀 (1) 将开启。 油流过安全阀,经端口 "T" 流向油箱。

负载感应排放调节器 (11) 安装在进口歧管中,当没有 LS 信号时,该调节器用于排放 LS 管路中的压力。 安装在 DLS 端口 (12) 中的节流孔(未显示)将设定 LS 备用压力。

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