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R900449957 4WH6D5X/力士乐手动换向阀

换向阀

作用:

利用阀芯相对于阀体间的相对位置改变，使油路接通、关断，或改变油流的方向，从而使液压执行元件启动、停止或变换运动方向。

1、对换向阀的性能要求

(1)油液导通时压力损失要小;

(2)油液断开时泄漏要小;

(3)阀芯换位时操纵力要小。

2、类型

按阀芯的形状分类滑阀、转阀

按阀的安装方式分类:管式、板式、法兰式。

按操纵方式分类: 

手动、机动、电动、弹簧控制、液动、液压先导控制、电液动等。

3、换向阀主体结构与工作原理

几种典型换向阀的结构

1、手动换向阀

2、机动换向阀，又称行程阀。

它是借助于安装在工作台上的挡铁或凸轮来迫使阀芯移动。通常是二位的，有二通、三通、四通和五通几种，其中二位二通机动阀又分常闭和常开两种。

WMM型手动换向阀是通过手柄的转动使阀芯做轴向移动从而对油路进行切换的直动式换向滑阀。具有二位三通，二位四通和三位四通多种滑阀机能。并可选择定位设备和弹簧复位装置，采用板式连接。

 WMM…/型（带复位弹簧，不带定位设备）：

该阀由阀体、手柄、阀芯、一个或两个复位弹簧和推杆等组成。

当未操纵手柄时，阀芯被复位弹簧保持在中位或初始位置上，当向右或向左推动手柄2时，手柄通过铰链推动推杆并直接控制阀芯，阀芯便移动到要求的位置，从而获得所需要的流动截面。当手柄回到零位时，控制阀芯借助复位弹簧回到正常位置。这种阀的切换位置由手柄操纵确定。

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力士乐REXROTH定向滑阀，直接操作，与流体驱动WH 6...XC

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力士乐REXROTH三位四通，二位四通和二位三通流体驱动换向阀WHZ 6

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力士乐REXROTH三位四通，二位四通和二位三通流体驱动换向阀WP 6

安全阀结构主要有两大类：弹簧式和杠杆式。弹簧式是指阀瓣与阀座的密封靠弹簧的作用力。杠杆式是靠杠杆和重锤的作用力。随着大容量的需要，又有一种脉冲式安全阀，也称为先导式安全阀，由主安全阀和辅助阀组成。当管道内介质压力超过规定压力值时，辅助阀先开启，介质沿着导管进入主安全阀，并将主安全阀打开，使增高的介质压力降低。