力士乐比例阀放大板VT-VRPA1-151-12/V0/0

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射流管阀是液体能量转换式放大器，属于非节流式放大器，其工作原理与滑阀和喷嘴挡板阀有根本区别，它们都是节流式放大器，其静特性的导出主要基于实验与推理。

滑阀和喷嘴挡板阀都是根据节流原理工作的，而射流管阀是根据压力能与动能转换原理工作的。它们都是根据要求，由输入量控制，将液压源的流量、压力通过控制阀送入液压执行元件中带动负载进行位置、速度、加速度、力和压力控制。

通常喷嘴挡板阀和射流管阀作前置级液压放大器，如两级伺服阀中的前置级，滑阀是三种液压控制阀中经常用的--种，如液压控制系统中的液压放大器、伺服阀、机液伺服机构和液压动力机构等都离不开滑阀。

通过对各种滑阀的稳态性能分析和比较得知:四通阀有两个节流口(控制口)同时工作控制对称液压缸，三通阀只有一个控制口工作控制差动缸。

因此，四通阀的压力增益比三通阀大- -倍，两者的流量增益相同，故四通阀的流量--压力系数比三通阀小--倍，四通阀比三通阀性能好。

同理，双喷嘴挡板阀性能比单喷嘴挡板阀好，零开口阀效率高，线性差，流量增益小，正开口阀效率低，线性好，流量增益大。喷嘴挡板阀属于正开口阀，所以正开口滑阀和喷嘴挡板阀适于作前置放大，零开口滑阀作前置放大和功率放大均可。

由于喷嘴挡板阀无摩擦，惯性力极小，其动态性能和灵敏度远优于滑阀。射流管阀由于结构因素，抗污染能力强，工作可靠，寿命长，这些又是滑阀和喷嘴挡板阀不可比拟的。

 

4WR...型比例控制阀

3.结构和功能原理

先导控制阀型号3DREP 6... 该先导阀是一个由比例电磁铁控制的三通减压阀,它的作用是将一个输入的电信号转化为一个与其成比例的压力输出信号,可用于所有的4WRZ..和5WR...型比例阀的控制。

比例电磁铁是可调式,湿式直流电磁结构,带中心螺纹,线圈可单独拆卸;电磁铁控制可通过外部放大器( WRZ型)或内置的放大器( WRZE型)来实现。

结构:

该阀主要由下列部分组成:

(1)带有安装底面的壳体( 1 );

(2)装有压力测量活塞(3和4)的控制阀芯(2 );

(3)带中心螺纹电磁铁( 5和6);

(4)可选带内置放大器( 7 )

工作原理:

(1)当电磁铁(5和6)不带电时,对中弹簧将控制阀芯(2)保持在中位;

(2)比例电磁铁带电被激励后, 会直接推动控制阀芯( 2),例如:电磁”a” (5)被激励;

(3)控制阀芯(2)和压力测量活塞(3)被推向左侧;

(4)位移与输入的电信号成比例。

这时,P口与B口及A口与T口通过阀芯与阀体形成的节流口1接通，节流特性为渐进式。如果电磁铁(5 )失电,控制阀芯( 2 )被弹簧重新推回中位。在先导阀的中位，A口、B口和T口相通,这也意味着油液可以从这里直接回油箱。

 

先导式比例方向阀, 型号4WRZ..和5WRZ.. , 4WRZ..型阀是先导式、比例电磁铁

控制的四通方向阀,它可控制液流的方向和大小。

结构:

该阀主要由下列部分组成:

(1)装有比例电磁. (5和6 )的先导控制阀( 9 )

(2)装有主阀芯(11)和对中弹簧(12)的主阀(10)

工作原理:

(1)当电磁铁(5和6)不带电时,对中弹簧(12)将主阀芯(11)保持在中位。

(2)主阀芯(11)的动作由先导阀(9)来控制-它会间接地被电磁铁”b"(6)成比例地推动。首先控制阀芯( 2 )被推向右侧,控制油经过先导阀(9 )进入控制腔( 13 )，并与输入信号成比例地推动主阀芯( 11 ), 这时,P口与A口及B口与T口通过阀芯与阀体形成的节流口接通,节流特性为渐进式。

(3)先导阀所需的控制油液可通过P口内供或X口外供。

(4)如果电磁铁(6)失电,控制阀芯( 2 )和主阀芯( 11 )会重新回到中位。

(5)随着主阀芯位置的不同, P口与A口、B口与T口(R)接通或P口与B口、A口与T口(R)通。可选保护罩手动应急操作( 14和15 ),它可使先导阀芯( 2 )在电磁不通电的情况下移动。

力士乐比例阀放大板VT-VRPA1-151-12/V0/0

力士乐REXROTH具有电位置反馈的比例阀的阀放大器

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力士乐REXROTHA4VS变量柱塞泵和A2V轴向柱塞泵与EO4变量轴向柱塞泵数字闭环控制电子放大板

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R901102344 VT-VPCD-1-1X/V0/1-C-1

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力士乐REXROTH高响应阀的阀用放大板

力士乐REXROTH模拟电路放大板，欧洲版制式

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力士乐REXROTH插入式切换放大器

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