Control Valve (Stick Lowering)
如果液压供油管路出现故障，或通向斗杆油缸的供油管路出现故障，斗杆降低控制阀可防止斗杆滑落。
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| 图 1 | g01459142 |
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简化液压示意图（斗杆降低控制阀） (1) 斗杆油缸 (2) 管路 (3) 管路 (4) 单向阀 (5) 安全阀 (6) 油道 (7) 阀 (8) 油道 (9) 单向阀 (10) 管路 (11) 先导管路 (12) 管路 (13) 先导控制阀 (14) 主控制阀 | |
当操作员将操纵手柄移至 STICK OUT（斗杆伸出）位置时，泵油从主控制阀 ( 14) 流向斗杆降低控制阀。 泵油流过单向阀 (4) 流入斗杆油缸 ( 1) 连杆端。
当操纵手柄返回 NEUTRAL（空档）时，斗杆油缸保持在提升位置。 单向阀 (4)、安全阀 ( 5) 和单向阀 (9) 阻止斗杆油缸缸盖端的机油流出斗杆油缸。
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| 图 2 | g01459169 |
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简化液压示意图（斗杆降低控制阀） (1) 斗杆油缸 (2) 管路 (3) 管路 (4) 单向阀 (5) 安全阀 (6) 油道 (7) 阀 (8) 油道 (9) 单向阀 (10) 管路 (11) 先导管路 (12) 管路 (13) 先导控制阀 (14) 主控制阀 | |
当操作员移动操纵手柄至 STICK IN（斗杆进入）位置时，先导油经过管路 ( 11) 输送至斗杆降低控制阀的孔口 ( Pi)。 先导油移向阀 ( 7)。 阀 (7) 向左移动。
泵油从主控制阀 (14 ) 经过管路 (3) 流入斗杆油缸缸盖端。
机油从斗杆油缸连杆端经过阀 ( 7) 流入主控制阀。 然后机油流回液压油箱。
当操纵手柄返回至 NEUTRAL（空档）位置时，阀 ( 7) 向右移。 斗杆油缸保持在位。
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