325D and 329D Excavators Hydraulic System Caterpillar


Stick Drift Reduction Valve

Usage:

325D L A3R
斗杆沉降阻尼阀位于主控制阀与斗杆油缸之间的斗杆液压回路中。 当斗杆操纵手柄处于空档位置时。 斗杆沉降阻尼阀阻止斗杆油缸连杆端的机油泄漏。 停止泄油可防止斗杆沉降。

斗杆伸出



图 1g03397893
斗杆沉降阻尼阀(斗杆伸出)
(1) 油道
(2) 阀
(3) 弹簧
(4) 弹簧腔
(5) 油道
(6) 端口
(7) 端口
(8) 端口
(9) 油道
(11) 滑阀
(15) 端口
(16) 斗杆沉降阻尼阀

当移动操纵手柄执行斗杆伸出操作时。 先导油并非从先导控制阀输送到斗杆沉降阻尼阀 (16) 的孔口 (15)。 滑阀 (11) 也不会移动。

从斗杆 II 控制阀流出的机油流进斗杆沉降阻尼阀的孔口 (6)。 从斗杆 l 控制阀流出的机油流进斗杆沉降阻尼阀的孔口 (7)。 流经孔口 (6) 和 (7) 的机油合流后流进油道 (1)。 由于油道 (1) 中的机油压力升高,阀 (2) 顶着弹簧 (3) 的弹力移动。 弹簧室 (4) 中的机油经过油道 (5) 和 (9),流向孔口 (8)。 现在,油道 (1) 输送的机油经过孔口 (8),流向斗杆油缸的连杆端。

斗杆收回



图 2g03666295
斗杆沉降阻尼阀(斗杆进入)
(1) 油道
(2) 阀
(3) 弹簧
(4) 弹簧腔
(5) 油道
(6) 端口
(7) 端口
(8) 端口
(11) 滑阀
(13) 排油管路
(15) 端口
(16) 斗杆沉降阻尼阀
(18) 端口
(20) 弹簧腔
(21) 油道
(22) 塞

当移动操纵手柄执行斗杆收回操作时。 先导油从先导控制阀输送到斗杆沉降阻尼阀 (16) 的孔口 (15)。 滑阀 (11) 向下移动,直到滑阀触及螺塞 (22)。 弹簧腔 (4) 中的机油经过通道 (5), 滑阀 (11 中的孔), 弹簧腔 (20), 通道 (21), 孔口 (18) 和 排油管路 (13) 流至液压油箱。

斗杆油缸连杆端的回油流进孔口 (8)。 由于弹簧室 (4) 中的压力较低,孔口 (8) 中的机油顶着弹簧 (3) 的弹力移动阀 (2)。 从斗杆油缸连杆端流出的机油经过孔口 (8)、油道 (1) 和油道 (7),流向斗杆 l 控制阀。

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