2FRE6A-2X/10QK4RV力士乐比例阀武汉现货

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恒压变量泵的基础知识，并附上翻译的老外的多媒体演示视频。希望对新手朋友能有些许帮助。

一、工作原理
恒压变量泵：拿泵的出口压力值和输入信号的值进行比较，然后通过变量机构的位置变化来确定泵的排量。
恒压变量控制：是指当流量做适应性的调节时，压力变动十分微小，可以向系统提供一个恒压源。
由于推动恒压阀动作的控制油，来自变量泵本身的出油口，所以属于自控式变量泵。

二、恒压变量泵的压力自动恒定过程：
如图所示：


CP为恒压阀，它的作用就是控制变量活塞缸的进油和回油，而控制活塞的伸出与回缩动作直接控制斜盘的倾角，从而使泵的排量发生变化。
恒压阀右侧调压弹簧的预紧力设定值为Pt（恒压阀的阀芯动作时行程非常小，可以认为弹簧的预紧力始终为其设定值Pt）；
泵的出口压力为Pp；
泵的出口流量为qp；
泵能输出的大流量qpmax；
负载所需流量qL。

1、排量增大的过程：当Pp

2、压力上升的过程：若随后负载所需要流量qL
力士乐 比例阀 武汉现货
3、排量减小的过程：当Pp>Pt时（泵出口的压力Pp上升到超过弹簧预紧力Pt时），恒压阀的阀芯右移，控制活塞无杆腔引入泵出口的高压油，斜盘倾角逐渐减小，终在qp=qL时停止。

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