Rexroth減壓閥現貨R900905251 LT07MKA-20/100/02M

Rexroth減壓閥現貨R900905251 LT07MKA-20/100/02M

武漢百士自動化設備有限公司專注于液壓、氣動、工控自動化備件銷售，熱誠歡迎新老客戶咨詢購買！

減壓閥
按逆時針旋轉至上位置（相對低出口壓力），然后關閉減壓閥后閘閥；
3、慢慢開啟減壓閥前的閘閥至全開；
4、順時針慢慢旋轉調節螺釘，將出口壓力調至所需要的壓力（以閥后表壓為準）；調整好后，將鎖緊
螺母鎖緊，打開減壓閥后閘閥；
5、如在調整時出口壓力高于設定壓力，須從第一步開始重新調整，即只能從低壓向高壓調。
主要作用
減壓閥的作用原理是靠閥內流道對水流的局部阻力降低水壓，水壓降的范圍由連接閥瓣的薄膜或活塞兩側的進出口水壓差自動調節。定比減壓原理是利用閥體中浮動活塞的水壓比控制，進出口端減壓比與進出口側活塞面積比成反比。這種減壓閥工作平穩無振動；閥體內無彈簧，故無彈簧銹蝕、金屬疲勞失效之慮；密封性能良好不滲漏，因而既減動壓（水流動時）又減靜壓（流量為0時）；特別是在減壓的同時不影響水流量。
水流通過減壓閥雖有很大的水頭損失，但由于減少了水的浪費并使系統流量分布合理、改善了系統布局與工況，因此總體上講仍是節能的。介質為蒸汽的場合，宜選用先導活塞式減壓閥或先導波紋管式減壓閥。為了操作、調整和維修的方便，減壓閥一般應安裝在水平管道上。
（1）出口壓力幾乎等于進口壓力，不減壓
這一故障現象表現為：減壓閥進出口壓力接近相等，而且出口壓力不隨調壓手柄的旋轉調節而變化。產生原因和排除方法如下。
①因主閥芯上或閥體孔沉割槽棱邊上有毛刺或者主閥芯與閥體孔之間的間隙里卡有污物，或者因主閥芯或閥孔形位公差超差，產生液壓卡緊，將主閥芯卡死在大開度(max)的位置上，由于開口大，油液不減壓。此時可根據上述情況分別采取去毛刺、清洗和修復閥孔和閥芯精度的方法予以排除。
②因主閥芯與閥孔配合過緊，或裝配時拉毛閥孔或閥芯，將閥芯卡死在大開度位置上，此時可選配合理的間隙。J型減壓閥配合間隙一般為0. 007～0. 015mm，配前可適當研磨閥孔，再配閥芯。
③主閥芯短阻尼孔或閥座孔堵塞，失去了自動調節機能，主閥彈簧力將主閥推往大開度，變成直通無阻，進口壓力等于出口壓力。可用φ1. Omm鋼絲或用壓縮空氣吹通阻尼孔，并進行清洗再裝配。
④對J型減壓閥，帶阻尼孔的阻尼件是壓入主閥芯內的，使用中有可能因過盈量不夠而沖出。沖出后，使進油腔與出油腔壓力相等（無阻尼），而閥芯上下受力面積相等，但出油腔有一彈簧，所以主閥芯總是處于大開度的位置，使出口壓力等于入口壓力。此時需重新加工外徑稍大的阻尼件并重新壓入主閥芯。
⑤JF型減壓閥，出廠時泄油孑L是用油塞堵住的。當此油塞未擰出而使用時，使主閥芯上腔（彈簧腔）困油，導致主閥芯處于大開度而不減壓。J型管式閥與此相同。J型板式閥如果設計安裝板時未使L口連通油池也會出現此現象。
⑥對J型管式閥，拆修時很容易將閥蓋裝錯方向（錯90°或180°），使外泄油口堵死，無法排油，造成同上的困油現象，使主閥頂在大開度而不減壓。修理時將閥蓋裝配方向裝對即可。

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