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力士乐减压阀分为直动式和先导式。通常我们使用先导式减压阀。力士乐减压阀的油通过先导阀和日常排放油流回油箱。由于阻尼孔作用引起的压力降，当主阀芯上下腔的压差大于弹簧10的预紧力时，主阀芯的上升减小了泄压口的间隙，增加了液压阻力，从而导致出口压力下降。相反，出口将反弹。力士乐减压阀使阀门的开度能自动调节，使出口压力稳定在设定值。力士乐减压阀的节流孔常开，由于压力油与进出口相连，因此出口应单独与油箱相连。力士乐调节先导阀的弹簧压力，以调节安全阀的控制压力，如果进口压力因外部扰动而增加，出口压力也增加了主阀芯向上移动，主阀开口减小，在新位置实现平衡，而出口压力基本不变：反之亦然，这样安全阀可以利用出口压力的反馈效应。自动控制阀的开启。识别出的出口压力基本是恒定的，因此称为恒压安全阀。当远程控制端口连接到远程压力调节阀时，远程压力调节阀的耐压低于减压阀的压力设定压力，可以实现二次减压。
力士乐比例减压阀
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