單向閥有直通式和直角式兩種。直通式單向閥用螺紋連接安裝在管路上。直角式單向閥有螺紋連接、板式連接和法蘭連接三種形式。液控單向閥也稱閉鎖閥或保壓閥，它與單向閥相同，用以防止油液反向流動。但在液壓回路中需要油流反向流動時又可利用控制油壓，打開單向閥，使油流在兩個方向都可流動。液控單向閥采用錐形閥芯，因此密封性能好。在要求封閉油路時，可用此閥作為油路的單向鎖緊而起保壓作用。液控單向閥控制油的泄漏方式有內泄式和外泄式二種。在油流反向出口無背壓的油路中可用內泄式；否則需用外泄式，以降低控制油壓力。
上海韋米機電設備有限公司位于浦東金橋是全國工業傳動流體自動化領域實力較強的經銷代理商，有著豐富的氣動液壓技術服務、工業銷售及國際采購的經驗，主營產品涉及液壓泵閥（電磁閥、柱塞泵拳頭產品）、工控產品、驅動模塊、伺服電機、可編程控制器PLC、數控傳動、傳感器系列、電源、氣動元件、工業儀器儀表。具體主要經營品牌及產品如下:
博世力士樂rexroth工業液壓氣動元件大量現貨（電磁換向閥、節流閥、單向閥、比例閥、伺服閥、安全溢流閥、流量控制閥、減壓閥、調節閥、壓力繼電器、比例放大板、放大器，軸向柱塞泵、葉片泵、齒輪泵，伺服驅動器、伺服電機，氣動元件、氣動閥、氣缸等），部分系列型號：
高頻響方向閥：4WRPH、4WRPEH、5WRP、5WRPE、4WRREH、4WRP、4WRPE、4WRP(E)H、4WRSE、4WRSEH、4WRPNH、4WRL、4WRLE、4WRVE、4WRGE、4WRL、4WRLE、4WRDE、3WRCBH，伺服系統：HAS、HNL、HCS、HNL
意大利阿托斯ATOS及迪普馬DUPLOMATIC、美國Parker派克及EATON VICKERS伊頓 威格士液壓、日本YUKEN油研泵閥優勢現貨系列（電磁閥換向閥、壓力開關、柱塞泵、齒輪泵、比例閥、截止閥、開關閥等），
奧地利貝加萊B&R ?br-automation自動化配品配件貨期短現貨多（伺服驅動器、觸摸屏、工控機、CPU模塊、總線控制器、X20\2003\2005\2010系統中各類功能模塊等）
博世力士樂電磁球閥M-3SEW10C
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力士樂Rexroth單向閥、力士樂Rexroth壓力繼電器、力士樂Rexroth方向閥、力士樂Rexroth溢流閥、
力士樂Rexroth電磁閥、力士樂Rexroth節流閥、力士樂液壓閥、博世力士樂比例閥、Bosch-Rexroth比例液壓閥、Rexroth 液壓產品 ?Rexroth 靜態配置液壓閥、rexroth力士樂比例液壓閥、rexroth液壓閥、REXROTH液壓閥力士樂0811系列、力士樂比例閥，比例流量閥 液壓閥、博世力士樂疊加式節流閥 兩路節流單向閥、力士樂壓力指示單元、
力士樂疊加式雙單向節流閥、力士樂德國力士樂REXROTH(液壓閥)單向節流閥、德國力士樂REXROTH(液壓閥)疊加式單向閥、力士樂截止閥-單向閥、力士樂插裝閥單向閥溢流閥、力士樂測試和維修單元、力士樂節流和單向節流閥
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