R901092786 4WRKE27E500L-35/6EG24K31/A1D3M比例阀 德国博世力士乐REXROTH比例阀 比例控制阀

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R901092786 4WRKE27E500L-35/6EG24K31/A1D3M比例阀

电气比例阀

自动控制可分成断续控制和连续控制。断续控制即开关控制。气动控制系统中使用动作频率较低的开关式(ON-OFF)的换向阀来控制气路的通断。靠减压阀来调节所需要的压力，靠节流阀来调节所需要的流量。这种传统的气动控制系统要想要有多个输出力和多个运动速度，就需要多个减压阀、节流阀及换向阀。这样，不仅元件需要多，成本高，构成系统复杂，且许多元件都需要预先进行人工调节。电气比例阀控制属于连续控制，其特点是输出量随输入量的变化而变化，输出量与输入量之间存在一定的比例关系。比例控制有开环控制和闭环控制之分。

结构原理

输入信号加大，供气用电磁阀先导阀1换向，而排气用电磁先导阀7处于复位状态，则供气压力从SUP口通过阀1进入先导室5，先导室压力上升，气压力作用在膜片2的上方，则和膜片2相连的供气阀芯4便开启，排气阀芯3关闭，产生输出压力。此输出压力通过压力传感器6反馈至控制回路8。在这里，与目标值进行快速比较修正，知道输出压力与输入信号成一定比例为止，从而得到输出压力与输入信号的变化成比例的变化。由于没有喷嘴挡板机构，故阀对杂质不敏感，可靠性高。

比例控制技术是在开关控制技术和伺服控制技术之间的过渡技术，采用比例放大器控制比例电磁铁，实现对比例阀的连续控制，从而实现对液压系统压力、流量、方向的无级调节；但是用比例方向阀进行速度控制时，如果负载是变化的，那么执行元件的速度就会受负载变化的影响（负载小时速度快，负载大时速度慢）；于是在系统设计时，人们引入了压力补偿器，它可以使比例阀阀口的压差保持恒定，使执行元件的速度不受负载变化的影响。

R901092786 4WRKE27E500L-35/6EG24K31/A1D3M比例阀

4WRKE型阀是两级比例方向阀。它们控制流向和大小。主级是位置控制的，因此在较大流量的情况下，控制阀芯的位置也不受流动力的影响。

这些阀主要由先导控制阀（1），壳体（8），主控制阀芯（7），盖（5和6），对中弹簧（4），感应位置传感器（9）和减压阀（3）。如果没有输入信号，则主控制阀芯（7）将通过对中弹簧（4）保持在中央位置。盖子（5和6）中的两个控制室都通过阀控制阀芯（2）连接到油箱。主控制阀芯（7）通过感应式位置传感器（9）连接到合适的控制电子设备。主控制阀芯（7）的位置变化和放大器结点求和时的命令值变化都会产生电压差。在比较命令值和实际值时，通过电子装置确定可能的控制偏差，并为先导控制阀（1）的比例电磁阀供电。电流在螺线管中感应出一个力，该力通过一排柱塞操作控制阀芯。通过控制横截面激活的流量导致主控制阀芯的调整。装有感应位置传感器（9）核心的主控制阀芯（7）移位，直到实际值与命令值相对应。在受控状态下，主控制阀芯（7）受力平衡并保持在该受控位置。控制阀芯行程和控制开度与指令值成比例地变化。控制电子装置集成在阀门中。通过调节阀门和电子设备，

不得将油箱管路排空；在相应的安装条件下，必须安装预载阀（预载压力约为2 bar）。

阀门特性

第二阶段基本上是我们比例阀模块的设置。“零点主级”的零点调整是在工厂进行的，并且可以通过控制电子装置中的电位计在标称冲程的±30％范围内进行调整。拧下盖板外壳前侧的螺塞，即可进入集成控制电子设备。更换先导控制阀或控制电子设备时，应重新进行调整。所有调整只能由经过指导的相关人士执行。

注意！

零点的变化可能会导致系统损坏，并且只能由经过培训的专业人员执行！

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安全阀是启闭件受外力作用下处于常闭状态，当设备或管道内的介质压力升高超过规定值时，通过向系统外排放介质来防止管道或设备内介质压力超过规定数值的特殊阀门。安全阀属于自动阀类，主要用于锅炉、压力容器和管道上，控制压力不超过规定值，对人身安全和设备运行起重要保护作用。注安全阀必须经过压力试验才能使用。