416F, 420F and 430F Backhoe Loaders Hydraulic and Steering System Caterpillar


Bank Valve (Backhoe) - Pilot Operated

Usage:

420F JWJ



图 1g02979217

带六个阀组的反铲控制阀

(1) 进口歧管

(2) 稳定器控制阀

(4) 斗杆控制阀

(5) 铲斗控制阀

(6) 回转控制阀

(7) 动臂控制阀

(8) 稳定器控制阀

(9) 出口歧管

(LS) 负载感应端口

(S) 泵供油口

(T) 油箱(回油)端口




图 2g02979218

带七个阀组的反铲控制阀

(1) 进口歧管

(2) 稳定器控制阀

(3) 可伸缩斗杆控制阀

(4) 斗杆控制阀

(5) 铲斗控制阀

(6) 回转控制阀

(7) 动臂控制阀

(8) 稳定器控制阀

(9) 出口歧管

(LS) 负载感应端口

(S) 泵供油口

(T) 油箱(回油)端口




图 3g02979219

带八个阀组的反铲控制阀

(1) 进口歧管

(2) 稳定器控制阀

(3) 可伸缩斗杆控制阀

(4) 斗杆控制阀

(5) 铲斗控制阀

(6) 回转控制阀

(7) 动臂控制阀

(8) 稳定器控制阀

(9) 出口歧管

(10) 辅助控制阀

(LS) 负载感应端口

(S) 泵供油口

(T) 油箱(回油)端口

反铲阀组包括六、七或八个控制阀。 除稳定器阀外,所有阀均为比例优先压力补偿 (PPPC) 阀。 机器可配置用于可伸缩斗杆的第七个阀和用于辅助功能的第八个阀。

每个控制回路中的压力补偿器形成一个负载感应 (LS) 信号压力。 单个控制阀中的供油分流到控制阀内的信号管路中。 在反铲总成的所有压力补偿器上可感应到最高 LS 信号。 在泵控制阀上也可感应到此 LS 压力。

注: 稳定器控制阀通常独立于所有其他控制回路操作。 因此,稳定器控制阀不需要是 PPPC。 当操作稳定器时,泵控制阀将向稳定器控制阀提供压力补偿。

阀端口朝向机器后部。

阀组(反铲控制)位于操作台后部地板下面。 阀安装在后机架上。

除可伸缩斗杆和辅助阀外的所有控制阀通过先导管路与操纵手柄相连。 可伸缩斗杆和辅助功能采用电动液压控制。 所有控制阀阀段都有一个闭心式位置。

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