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力士乐比例阀是一种新型的液压控制装置，在普通压力阀、流量阀和方向阀上，用比例电磁铁替代原有的控制部分，按输入的电气信号连续地、按比例地对油流的压力、流量或方向进行远距离控制。力士乐比例阀一般都具有压力补偿性能，输出压力和流量可以不受负载变化的影响
力士乐比例阀的工作原理如下：在不制动时,活塞在感载弹簧通过杠杆施加的推力F的作用下,处 于左端极限位置,这时阀门离开阀座打开,使输入输出油路相通。当开始制动时,来自助力器的压力为P1的制动液由进油口进入,并通过阀门从出油口输至后制动管路.此时输出液压P,等于输入液压P1当制动踏板力增大时,P1和P2同步增大。但由于活塞左侧承压面积大于右侧,致使活塞左侧受到的力也大于右侧. Rexroth力士乐比例阀的结构和其它参数一定的情况下,调节作用的初始控制压力P·的值取决于感载的比例阀感载弹簧预紧力的大小,其变化范围在.
■规格6和10
■安装面按*** 4401
■控制流量的方向和大小
■比例电磁铁操作
■对中弹簧控制阀芯
■不同阀芯可遮盖
■集成控制电气元件（OBE）用于4WREE型
6 通径和 10 通径直动式比例方向阀，带集成的阀电子元件和位
控阀芯。控制电子元件（VT 13080 和 VT 13081 类型）集成
在阀上。
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