威格士比例阀KBCG-3-L100D-Z-M2-3-A-PE7-H1-10 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*da、要么*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。
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。
方向阀 02-342113 DG4S4-019A-UG-60-S491
方向阀 02-399306 DG4S4-019A-UH-60-S491
方向阀 283636 DG4S4L 012C 110AC50 50
方向阀 02-127753 DG4S4L-012A-B-60-LH
方向阀 363444 DG4S4L-012N-110AC50-51
方向阀 02-329212 DG4S4LW 012A D 60 LH
方向阀 02-119576 DG4S4LW-012A-B-60
方向阀 02-119978 DG4S4LW-012A-B-60-LH
方向阀 02-119493 DG4S4LW-012C-B-60
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方向阀 02-119767 DG4S4W-012A-B-60
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方向阀 02-126582 DG4S4W-012A-D-60
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SHAFT #1 27/42 VTM
DG5V-5-2C-PDA-T-M-U-H7-10
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