Main Relief Valve
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| 图 1 | g00465999 |
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动臂和吊钩控制阀的主安全阀 (A) 进口 (B) 安全端口 (1) 弹簧腔 (2) 调整螺钉 (3) 弹簧 (4) 先导阀 (5) 弹簧 (6) 卸载阀 | |
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| 图 2 | g00466126 |
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主安全阀的位置 (7) 主安全阀 | |
主安全阀安装在驾驶室地板下方的动臂和吊钩控制阀中。 安全阀是先导操作阀。 该阀将系统压力限制在大约
泵油通过端口 (A) 进入安全阀 (7)。 油流经卸载阀 (6) 中的一个节流孔。 油填充弹簧室 (1)。 此压力开始建立在先导阀 (4) 上。
当油压小于安全阀设定值时，卸载阀 (6) 由弹簧 (5) 保持关闭，先导阀 (4) 由弹簧 (3) 保持关闭。
当油压达到安全阀设定值时，先导阀 (3) 打开。 油室 (1) 中的油以比通过卸载阀 (6) 中节流孔的油更快速地卸放油箱中。 这会使油室 (1) 中的压力降低。 泵油的压力克服弹簧 (5) 的力向上移动卸载阀 (6)。 这将打开至油箱的端口 (B)，泵油流卸放到油箱中。
可通过改变保持先导阀 (4) 关闭的弹簧 (3) 的力来改变安全阀的压力设定。 这是通过转动调整螺钉 (2) 完成的。 当顺时针转动螺钉时，压力增加。 当逆时针转动螺钉时，压力降低。 一整圈等于大约
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