Rexroth减压阀现货R900905251 LT07MKA-20/100/02M

武汉百士自动化设备有限公司专注于液压、气动、工控自动化备件销售，热诚欢迎新老客户咨询购买！

减压阀
按逆时针旋转至上位置（相对低出口压力），然后关闭减压阀后闸阀；
3、慢慢开启减压阀前的闸阀至全开；
4、顺时针慢慢旋转调节螺钉，将出口压力调至所需要的压力（以阀后表压为准）；调整好后，将锁紧
螺母锁紧，打开减压阀后闸阀；
5、如在调整时出口压力高于设定压力，须从第一步开始重新调整，即只能从低压向高压调。
主要作用
减压阀的作用原理是靠阀内流道对水流的局部阻力降低水压，水压降的范围由连接阀瓣的薄膜或活塞两侧的进出口水压差自动调节。定比减压原理是利用阀体中浮动活塞的水压比控制，进出口端减压比与进出口侧活塞面积比成反比。这种减压阀工作平稳无振动；阀体内无弹簧，故无弹簧锈蚀、金属疲劳失效之虑；密封性能良好不渗漏，因而既减动压（水流动时）又减静压（流量为0时）；特别是在减压的同时不影响水流量。
水流通过减压阀虽有很大的水头损失，但由于减少了水的浪费并使系统流量分布合理、改善了系统布局与工况，因此总体上讲仍是节能的。介质为蒸汽的场合，宜选用先导活塞式减压阀或先导波纹管式减压阀。为了操作、调整和维修的方便，减压阀一般应安装在水平管道上。
（1）出口压力几乎等于进口压力，不减压
这一故障现象表现为：减压阀进出口压力接近相等，而且出口压力不随调压手柄的旋转调节而变化。产生原因和排除方法如下。
①因主阀芯上或阀体孔沉割槽棱边上有毛刺或者主阀芯与阀体孔之间的间隙里卡有污物，或者因主阀芯或阀孔形位公差超差，产生液压卡紧，将主阀芯卡死在大开度(max)的位置上，由于开口大，油液不减压。此时可根据上述情况分别采取去毛刺、清洗和修复阀孔和阀芯精度的方法予以排除。
②因主阀芯与阀孔配合过紧，或装配时拉毛阀孔或阀芯，将阀芯卡死在大开度位置上，此时可选配合理的间隙。J型减压阀配合间隙一般为0. 007～0. 015mm，配前可适当研磨阀孔，再配阀芯。
③主阀芯短阻尼孔或阀座孔堵塞，失去了自动调节机能，主阀弹簧力将主阀推往大开度，变成直通无阻，进口压力等于出口压力。可用φ1. Omm钢丝或用压缩空气吹通阻尼孔，并进行清洗再装配。
④对J型减压阀，带阻尼孔的阻尼件是压入主阀芯内的，使用中有可能因过盈量不够而冲出。冲出后，使进油腔与出油腔压力相等（无阻尼），而阀芯上下受力面积相等，但出油腔有一弹簧，所以主阀芯总是处于大开度的位置，使出口压力等于入口压力。此时需重新加工外径稍大的阻尼件并重新压入主阀芯。
⑤JF型减压阀，出厂时泄油孑L是用油塞堵住的。当此油塞未拧出而使用时，使主阀芯上腔（弹簧腔）困油，导致主阀芯处于大开度而不减压。J型管式阀与此相同。J型板式阀如果设计安装板时未使L口连通油池也会出现此现象。
⑥对J型管式阀，拆修时很容易将阀盖装错方向（错90°或180°），使外泄油口堵死，无法排油，造成同上的困油现象，使主阀顶在大开度而不减压。修理时将阀盖装配方向装对即可。

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