WETIEN液控单向阀MPCV节流阀MTCV减压阀MBRV溢流阀MRV-02/03-W-P
液压系统单向节流阀的结构及工作原理
单向节流阀由单向阀和节流阀并联而成,用于一个方向需要控制流量而另一个方向(反向)需要油流畅通的回路中,以实现执行元件正向可调速,而反向能快速退回。
下面就带大家来了解下单向节流阀的结构及其工作原理。
图1所示爲滑阀压差式单向节流阀。当油液从P1流向P2时,阀起节流阀作用,反向时起单向阀作用。阀芯4下端和上端分别受进、出油腔压力油的作用,在进出油腔压差和複位弹簧6的作用下,阀芯紧压在调节螺钉2上,以保持原来调节好的节流口开度。
滑阀压差式单向节流阀
图2所示爲可以直接安装在管路上的单向节流阀。节流口爲轴向三角槽式结构,旋转调节套3,可以改变节流口通流面积的大小,实现流量调节。正向流动时(B→A)起节流阀作用;反向流动时(A→B)起单向阀作用,由于有部分油液可在环形缝隙中流动,可以清除节流口上的沉积物。阀芯左端有刻度槽,调节套上有刻度圈,以标志调节流量的大小。该阀流量调节须在无压力下进行。博士力乐士系列的MK型单向节流阀即爲此结构。
管式单向节流阀
单向节流阀在结构上有两种,一种是单向阀和节流阀共用一个阀芯,另一种是单向阀和节流阀两个阀芯是分开的。如:中低压单向节流阀(LI型),节流阀与单向阀共用一个阀芯,中高压单向节流阀(LDF型)两个阀芯是分开的,它们的压力流量系列均同节流阀。它们的结构见图3~图5所示。
单向节流阀结构
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