2.先導(dǎo)式單向閥，無泄露。調(diào)速閥；它根據(jù)供入執(zhí)行器對(duì)側(cè)的流量Q1控制回路量Q2。在缸中，必須考慮面積比。旁通閥，為使相反方向自由流動(dòng)。外部疊加次級(jí)壓力溢流閥（僅發(fā)蘭安裝）德國(guó)FD力士樂平衡閥

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