博世力士乐rexroth比例阀 力士乐换向阀 

力士乐rexroth比例阀 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，流量要么最大、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。
力士乐rexroth比例阀 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。
所以使用比例阀或伺服阀的目的就是：以电控方式实Ψ 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①一定的流量来维持前置级控△制油路的工作。

力士乐rexroth博世bosch 比例阀 力士乐←比例方向阀 博世力士乐换向⊙阀
德国博世力士乐rexroth换向阀 力士乐液压阀 力士乐比例阀
0811A04639 REGELVENTIL0811404639-PU1
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