乐REXROTH流量阀2FRM6B36-2X/0.6QRV-IN001由上海韦米机电设备有限公司专业提供
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乐REXROTH流量阀2FRM6B36-2X/0.6QRV-IN001
2FRM 型调速阀
1.结构和工作原理
2FRM型调速阀是两通的流量控制阀。此阀是由减压阀和节流阀串联构成的，油流进入调速后，先以过减压阀减压，再由节流阀节流。由于减压阀对节流阀进行了压力补偿，所以调速阀的流量不受负载变化的影响，保持稳定，同时节流窗口设计成薄刃状，流量受温度变化很小。调速阀与单向阀并联时，油流能反向回流。
Z4S型整流板装在调速阀下，可以稳定通过调速阀两个方向的流量。
2.调速阀的常见故障及排除
流量调节失灵
这是指调整节流调节部分，出油腔流量不发生变化，其主要原因是阀芯径向减压阀芯或节流阀芯在全闭位置时，径向卡住会使出油腔没有流量，在全开位置(或节流口调整好)时，径向卡住会使调整节流调节部分出油腔流量不发生变化。
另外，当节流调节部分发生故障时，会使调节螺杆不能轴向移动，使出油腔流量也不发生变化。发生阀芯卡住或节流调节部分故障时，应进行清洗和修复。
(二)流量不稳定
减压节流型调速阀当节流口调整好锁紧后，有时会出现流量不稳定现象，特别在小稳定流量时易发生。其主要原因是锁紧装置松动，节流口部分堵塞，油温升高，进、出油腔小压差过低和进、出油腔接反等。
油流反向通过QF型调速阀时，减压阀对节流阀不起压力补偿作用，使调速阀变成节流阀。故当进、出油腔油液压力发生变化时，流经的流量就会发生变化，从而引起流量不稳定。
因此在使用时要注意进、出油腔的位置，避免接反。
(三)内泄漏量加大
减压节流型调速阀节流口关闭时，是靠间隙密封，因此不可避免有一定的泄漏量，故它不能作为截止阀用。当密封面(减压阀芯、节流阀芯和单向阀芯密封面等)磨损过大后，会引起内泄漏量增加，使不稳定，特别会影响到小稳定流量。卡住和节流调节部分发生故障等。
流量控制阀
功用:通过改变阀口过流面积来调节输出流量，从而控制执行元件的运动速度。
分类:节流阀、调速阀、温度补偿调速阀、分流集流阀。
常用节流口结构有锥形、三角槽形、矩形、三角形等。由节流方程知，当压力差.定时，改变开口面积即改变液阻就可改变流量。
节流阀实质相当于-一个可变节流口，借助控制机构使阀芯相对于阀体孔运动改变阀口的过流面积。
结构原理
主要零件有阀芯、阀体和螺母。阀体上右边是进油口，左边是出油口。阀芯一端开有三角尖槽，另-端加工有螺纹，旋转阀芯即可轴向移动改变阀口过流面积。为平衡液压径向力，三角槽须对称布置。
调速阀定差减压阀与节流阀串联而成，用来调节通过的自动补
偿负载变化的影响。
乐REXROTH流量控制阀
乐REXROTH双向流量控制阀2FRM6A
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乐REXROTH二通流量控制阀2FRM6B
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乐REXROTH双向流量控制阀2FRM6SB
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乐REXROTH二通流量控制阀2FRM
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