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D*1FW/ D*1FB系列先导式比例换向阀被用于控制流量。
D*1FW系列采用PWD00A-400功率放大器进行电控；
D*1FB系列采用集成的电子元件插装在阀上组成一体。
该阀共有10通径、16通径、25通径、32通径几种规格。应用于通过调节斜坡信号可使阀芯柔和换向，以此来减小液压和机械冲击，通过电气方式调节流量/速度可实现机械功能的自动化。
特点：
泄漏量小；
渐进的流量特性使得流量调节灵敏；
弹簧对中的主级；
比例先导；
安全系统的初始位置监控；
D*1FB系列带有集成的功率放大器；
D*1FW带有数字式Snap-On功率放大器。
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