ATOS先導(dǎo)型溢流閥由主閥和先導(dǎo)閥兩部分組成。先導(dǎo)閥類似于直動型溢流閥，但一般多為錐閥（或球閥）形閥座式結(jié)構(gòu)。主閥可分為一節(jié)同心結(jié)構(gòu)、二節(jié)同心結(jié)構(gòu)和三節(jié)同心結(jié)構(gòu)。三節(jié)同心結(jié)構(gòu):主閥芯與閥蓋、閥體與主閥座等三處有同心配合要求，屬于三節(jié)同心結(jié)構(gòu)。壓力油自閥體中部進(jìn)油口進(jìn)入，并主閥芯上阻尼孔進(jìn)入主閥芯上腔，油閥蓋上通道和錐閥座上小孔作用與錐閥上。當(dāng)進(jìn)油口壓力小于先導(dǎo)閥調(diào)壓彈簧調(diào)定值時，先導(dǎo)閥關(guān)閉，主閥芯上、下兩側(cè)有效面積比為1.03～1.05，上側(cè)稍大，作用與主閥芯上壓力差和主閥彈簧力均使主閥口閉緊，不溢流。當(dāng)進(jìn)油壓力超過先導(dǎo)閥調(diào)定壓力時，先導(dǎo)閥被打開，造成資金油口P井主閥芯阻尼孔、先導(dǎo)閥口、主閥芯中心孔至閥體下部出油口（溢流口）流動。阻尼孔處流動損失使主閥芯上、下腔中油液產(chǎn)生一個隨先導(dǎo)閥流量增加而增加壓力差，當(dāng)它主閥芯上、下作用面上產(chǎn)生總壓力差足以克服主閥彈簧力、主閥自重和摩擦力時，主閥芯開啟。此時進(jìn)油口與出油口（溢流口）直接相通，造成溢流以保持系統(tǒng)壓力。

ATOS先導(dǎo)型溢流閥故障失靈及造成的原因：先導(dǎo)閥閥芯彈簧折斷；陰尼孔堵塞；先導(dǎo)閥閥口密封不良；主閥芯卡死等。相應(yīng)的排除措施是：更換或在折斷處加平墊以應(yīng)急使用；清洗疏通；研磨或?qū)⒃撚吐窋嗦芬詰?yīng)急使用；研磨、清洗。

限壓不穩(wěn)：先導(dǎo)型溢流閥限壓不穩(wěn)，表現(xiàn)為液壓系統(tǒng)壓力偏低或偏高，液壓執(zhí)行元件動作無力或油管、泵體、閥體爆裂。造成限壓不穩(wěn)故障的原因：壓力調(diào)整不當(dāng)；先導(dǎo)閥閥芯彈簧彎曲或變軟；油液過臟或油液流動不暢。相應(yīng)的排除措施是：重新調(diào)整；校正、加墊或更換；更換、清洗。先導(dǎo)型溢流閥限壓不穩(wěn)為漸發(fā)性故障，先導(dǎo)型溢流閥失靈為突發(fā)性故障，在排除完故障后，應(yīng)按系統(tǒng)所限定的壓力對先導(dǎo)型溢流閥控制的壓力重新進(jìn)行調(diào)整。 

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ATOS先導(dǎo)式溢流閥

AGAM-10/350

AGAM-10/50 34

AGAM-20/10/100/V-IX 24DC 53

AGAM-20/10/210/V-IX 24DC 53

AGAM-20/10/210-IX 230/50/60AC

AGAM-20/10/210-IX 24DC

AGAM-20/10/350-IX 230/50/60AC

AGAM-20/10/350-IX 24DC

AGAM-20/100

AGAM-20/11/210/M-AO 220 21

AGAM-20/11/210/V-IX 24DC 53

AGAM-20/11/210-IX 230/50/60AC

AGAM-20/11/210-IX 24DC

AGAM-20/11/350-IX 24DC 53

AGAM-20/210

AGAM-20/210/V 53 /WG

AGAM-20/22/350/350-IX 24DC

AGAM-20/350

AGAM-32/10/210-IX 24DC

AGAM-32/10/350-IX 24DC

AGAM-32/20/210/210/V-IX 230/50/60AC 53

AGAM-32/20/210/210-IX 230/50/60AC

AGAM-32/20/350/210-IX 24DC 53

AGAM-32/210 53

AGAM-32/350

AGAM-32/350/V 53

ARAM-20/10/100/V-IX 110/50/60A

ARAM-20/10/210-IX 24DC 72

ARAM-20/100 72

ARAM-20/210

ARAM-20/350 72

ARAM-32/11/210-IX 110/50/60AC

AGAM-10/10/100 34

AGAM-10/10/100-IX 230/50/60AC 34

AGAM-10/10/100-IX 24DC

AGAM-10/10/210

AGAM-10/10/210/V-IX 24DC

AGAM-10/10/210-IX 230/50/60AC

AGAM-10/10/210-IX 24DC

AGAM-10/10/210-IX 24DC 34/WG

AGAM-10/10/350 34

AGAM-10/10/350/V-IX 24DC

AGAM-10/10/350-1X 24DC 34

AGAM-10/100

AGAM-10/100/V

AGAM-10/11/100 34

AGAM-10/11/100/7PA-M-AO 24DC

AGAM-10/11/100-IX 230/50/60AC

AGAM-10/11/210-IX 230/50/60AC

AGAM-10/11/210-IX 24DC

AGAM-10/11/350/PA-GK-AO 24DC 22

AGAM-10/11/350-IX 110/50/60AC

AGAM-10/11/350-IX 24DC

AGAM-10/20/210/100-IX 24DC

AGAM-10/20/350/100-IX 230/50/60AC 34

AGAM-10/20/350/210/V-IX 230/50/60AC 34

AGAM-10/20/350/210-IX 230/50/60AC 34

AGAM-10/20/350/210-IX 24DC 34

AGAM-10/21/350/100-IX 24DC 34

AGAM-10/21/350/210-IX 230/50/60AC 34

AGAM-10/210

AGAM-10/210/V 34

ATOS放大器

E-BM-AC-011F

E-BM-AC-01F 11/2

E-BM-AC-01F 11/3

E-BM-AC-01F/RR 11/A1

E-BM-AC-05F 11/3

E-BM-AC-05F 11/4

E-BM-AC-05F/RR 11/3

E-ME-AC-01F 20

E-ME-AC-01F 20/1

E-ME-AC-01F 20/2

E-ME-AC-01F 20/3

E-ME-AC-01F 20/4

E-ME-AC-01F 20/6

E-ME-AC-01F 20/A1

E-ME-AC-01F 20/A2

E-ME-AC-01F 20/A4

E-ME-AC-01F/4R-4 20

E-ME-AC-01F/4R-4 20/2

E-ME-AC-01F/4R-4 20/3

E-ME-AC-01F/4R-4 20/6

E-ME-AC-01F/I 20

E-ME-AC-01F/I 20/2

E-ME-AC-01F/I 20/4

E-ME-AC-01F/I 20/6

E-ME-AC-01F/RR 20/4

E-ME-AC-01F/RR 20/A2

E-ME-AC-01F/RR-4 20

E-ME-AC-01F/RR-4 20/3

E-ME-AC-01F/RR-4 20/6

E-ME-AC-01F-4 20/2

E-ME-AC-05F 20

E-ME-AC-05F 20/2

E-ME-AC-05F 20/3

E-ME-AC-05F 20/4

E-ME-AC-05F 20/A3

E-ME-AC-05F/4R-4 20/3

E-ME-AC-05F/4R-4 20/4

E-ME-AC-05F/I 20

E-ME-AC-05F/I 20/3

E-ME-AC-05F/I 20/4