比例阀对流量的控制可以分为两种：
一种是开关控制：要么全开、要么全关，流量要么最da、要么最小，没有中间状态，如普通的电磁直通阀、电磁换向阀、电液换向阀。
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。D41FHB32B4NB00
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