先导式减压阀DR20-5-5X/200YM

先导式减压阀DR20-5-5X/200YM 德国进口博世力士乐REXROTH直动式减压阀 先导式减压阀

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先导式减压阀DR20-5-5X/200YM

特点

采用直接作用隔膜式结构，内部结构非常简单，无卡阻，性能可靠，经久耐用。耐脏防水垢，不需过滤器，不需旁通管，配管极其简单，能节省大量空间和配管成本。出口压力准确可调，在一般场合下，可以认为出口压力不受进口压力的影响（出口压力的变化量是△P1的8%）。非常好的水力特性，压力损失小，减压比可达成10：1以上。可满足多种减压要求，特别适用于支管减压系统。

工作原理

减压阀出口压力作用在隔膜底面和阀瓣底面，当它超过弹簧设定值时，压缩弹簧，使阀瓣关闭。只要下游无水流动，出口压力将基本保持在设定值（其变化量仅为入口压力变化量的8%）；当下游用水时，出口压力下降，弹簧推开隔膜，打开减压阀。水流连续流通一阵后，减压阀的开启产生自阻尼效应，使启闭动作趋于平稳。四、可能的故障原因1.霜冻损坏，在寒冷地区应注意保温。2.水流方向装错，减压阀变成止回阀，出口压力为0。3.弹簧拧得太紧，无法关闭，减压阀将直通P2=P1。4.旁通管漏水，使P2偏离设定值，鉴于本减压阀优越的可靠性和耐久性，建议不安装亮度通管为宜。

安装事项编辑

减压阀的减压保障系统

无论选用比例式还是可调式减压阀，其减压比P1∶P2不宜选择过大，一般应控制在5∶1之内。超过这个范围易产生气蚀现象，损坏阀件，产生啸叫噪音。有些活塞式减压阀，制造厂在其阀体上加工一个直径1.5mm左右的小孔，其功能是让阀芯运动时起到透吸气作用，维护管理时应注意千万不要将小孔塞住，否则影响减压阀的正常运行。

减压阀采用直接作用隔膜式结构，内部结构非常简单，无卡阻，性能可靠，经久耐用。耐脏防水垢，不需过滤器，不需旁通管，配管极其简单，能节省大量空间和配管成本。出口压力准确可调，在一般场合下，可以认为出口压力不受进口压力的影响（出口压力的变化量是△P1的8%）。非常好的水力特性，压力损失小，减压比可达成10：1以上。可满足多种减压要求，特别适用于支管减压系统。

定值器是一种高精度的减压阀，主要用于压力定值。目前有两种压力规格的定值器：其气源压力分别为0．14MPa和0．35MPa，输出压力范围分别为0—0．1MPa和0一0．25MPa。其输出压力波动不大于较大输出压力的1%，常用于需要供给较好气源压力和信号压力的场合，如气动实验设备、气动自动装置等。

先导式减压阀DR20-5-5X/200YM

DR型压力阀是先导式减压阀。它用于降低系统压力。

它主要由旋入式插装阀（滤芯）和外壳组成，可以选择是否带有止回阀（仅用于底板安装）。

在静止位置，阀门打开。液压油能够从输入通道通过主控制阀芯（1）自由流动到输出通道。出口通道中的压力通过孔（2）施加到主控制阀芯（1）的弹簧加载侧。同时，压力通过孔（3）和（4）作用在主控制阀芯（1）的与弹簧相对的一侧。

如果出口通道中的压力超过在弹簧（6）上设定的值，则先导提升阀（5）打开。

液压油从主控制阀芯（1）的弹簧加载侧通过喷嘴（7）和先导提升阀（5）流入弹簧腔（8）。

主控制阀芯（1）处于其控制位置，并将弹簧（6）上设定的出口通道中的值保持恒定。从弹簧腔（8）返回的先导油总是通过Y口（9）从外部实现。

在底板安装版本“ P”中，可以选择安装一个止回阀（10），以实现从通道A到B的自由回流。

类型DR 10 -4-4X /…

先导式减压阀DR20-5-5X/200YM型号

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R900930528 DRC30-5-5X/50YMSO184

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R900561022 DRC4-5X/200Y

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R978868322 DRC30-2-5X/315Y/12

R978897394 DRC30-5-5X/200Y/12

力士乐REXROTH先导式减压阀DR

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R900558878 DR10G5-4X/100YM=LB

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R900415429 DR10-4-4X/200Y

R900413340 DR10-4-4X/200Y/5

R900558884 DR10-4-4X/200Y=LB

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R900490762 DR10-4-4X/200YM/V/5

R900343830 DR10-4-4X/200YMV

R900343865 DR10-4-4X/200YV

R900414331 DR10-4-4X/315Y

R900380777 DR10-4-4X/315YSO150

换向阀主要由阀体、密封组件、凸轮、阀杆、手柄和阀盖等零部件组成(图1)。阀门由手柄驱动，通过手柄带动阀杆与凸轮旋转，凸轮具有定位驱动与锁定密封组件的开启与关闭功能。手柄逆时针旋转，两组密封组件分别在凸轮的作用下关闭下端的两个通道，上端的两个通道分别与管道装置的进口相通。反之，上端的两个通道关闭，下端两个通道与管道装置的进口相通，实现了不停车换向。