| 最大压力 : | 35 | 性能 : | 耐磨 |
| 工作电压 : | 24 | 驱动方式 : | 电磁 |
| 类型(通道位置) : | 先导式 | 连接形式 : | 内螺纹 |
| 品牌 : | PARKER/派克 | 材质 : | 碳钢 |
| 规格 : | D91FHE01H4NB00 | 压力环境 : | 高压 |
| 适用介质 : | 油品 | 用途 : | 换向 |
| 流动方向 : | 双向 | 适用范围 : | 流体控制 |
| 产品别名 : | 换向阀 | 型号 : | D91FHE01H4NB00 |
| 工作压差 : | 1.5 | 介质温度 : | 85℃ |
另一种是连续控制：阀口可以根据需要打开任意一个开度，由此控制通过流量的大小，这类阀有手动控制的，如节流阀，也有电控的，如比例阀、伺服阀。
所以使用比例阀或伺服阀的目的就是：以电控方式实现对流量的节流控制（当然经过结构上的改动也可实现压力控制等），既然是节流控制，就必然有能量损失，伺服阀和其它阀不同的是，它的能量损失更大一些，因为它需要一定的流量来维持前置级控制油路的工作伺服阀的主阀一般来说和换向阀一样是滑阀结构，只不过阀芯的换向不是靠电磁铁来推动，而是靠前置级阀输出的液压力来推动，这一点和电液换向阀比较相似，只不过电液换向阀的前置级阀是电磁换向阀，而伺服阀的前置级阀是动态特性比较好的喷嘴挡板阀或射流管阀。
也就是说，伺服阀的主阀是靠前置级阀的输出压力来控制的，而前置级阀的压力则来自于伺服阀的入口p，假如p口的压力不足，前置级阀就不能输出足够的压力来推动主阀芯动作。
而我们知道，当负载为零的时候，如果四通滑阀完全打开，p口压力=t口压力+阀口压力损失（忽略油路上的其它压力损失），如果阀口压力损失很小，t口压力又为零，那么p口的压力就不足以供给前置级阀来推动主阀芯，整个伺服阀就失效了。
所以伺服阀的阀口做得偏小，即使在阀口全开的情况下，也要有一定的压力损失，来维持前置级阀的正常工作。
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