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Technical articles美國(guó)parker派克 D*FW/D*FB系列直動(dòng)式換向閥是一種用于流量控制的比例閥。
D*FW系列采用PWD-400/PCD-400功率放大器進(jìn)行電控;
D*FB系列采用集成的電子元件插裝在閥上組成一體。
該閥共有6通徑、10通徑兩種規(guī)格。應(yīng)用于通過(guò)調(diào)節(jié)斜坡信號(hào)可使閥芯柔和換向,以此來(lái)減小液壓沖擊和機(jī)械沖擊,通過(guò)電氣方式調(diào)節(jié)流量/速度可實(shí)現(xiàn)機(jī)械功能自動(dòng)化。
特點(diǎn):
泄漏量小;
漸進(jìn)的流量特性使的流量調(diào)節(jié)靈敏;
彈簧對(duì)中的閥芯;
D*FB系列帶有集成的功率放大器;
D*FW系列帶有數(shù)字式Snap-On功率放大器;
應(yīng)急手動(dòng)操縱。
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D1VW020BNJW 清倉(cāng)處理PARKER派克D41FH系列先導(dǎo)式比例換向閥被用于控制流量,該閥具有集成的電子元件,主級(jí)的閥芯位置可調(diào),典型的應(yīng)用是:流量控制準(zhǔn)確和可實(shí)現(xiàn)流量調(diào)節(jié),在快速/低速特性下的工作運(yùn)行帶有閥芯位置監(jiān)控用于:壓力機(jī)控制,動(dòng)態(tài)位置調(diào)節(jié)和壓力/流量閉環(huán)系統(tǒng)吸力的大小因極靴1與銜鐵間的距離不同而變化 PARKER比例電磁閥的結(jié)構(gòu)如圖5-27所示工作過(guò)程:當(dāng)力矩馬達(dá)沒(méi)有電信號(hào)輸入時(shí),銜鐵位于極靴氣隙中間,平衡較久磁鐵的磁性力,當(dāng)有電流加在線圈上時(shí),銜鐵與控制信號(hào)成比例地偏轉(zhuǎn),產(chǎn)生一個(gè)順時(shí)針或逆時(shí)針運(yùn)動(dòng),方向取決于輸入控制信號(hào)的極性D31FBE02CC2NKW0
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D1VW020BNJW 德國(guó)rexroth比例閥VT-NE30-2X的輸入壓力為零.即.;時(shí),輸出腔的壓力通過(guò)比例閥皮圈凸筋間空酸從唇口泄去高壓,同時(shí),當(dāng)比例閥芯所受的彈簧力大于向右的液壓力時(shí),比例閥彈簧將比例閥芯推回原始位置,使比例閥芯與比例閥皮圈內(nèi)孔*分離而*泄壓.此時(shí)輸入輸出壓力為零.隨著輸入壓力.增大,即左增大,使比例滑閥單向力平衡遭破壞.當(dāng)<>&;6-時(shí),比例閥芯左移與比例閥皮圈產(chǎn)生間隙形成節(jié)流并混合比倒閥常見(jiàn)的故障為:1,輸入輸出壓力同步.2,低壓時(shí)輔人輸出壓力同步,高壓時(shí)輸入輸出壓力正常.3,低壓時(shí)輸入輸出壓力正常,高壓時(shí)輸入輸出壓力不正常.,1994.№為零時(shí)為混合比倒圉工作性能試驗(yàn)示意圖.試驗(yàn)時(shí),先將管內(nèi)的空氣排凈,然后分別取低,中,高三個(gè)壓力進(jìn)行試驗(yàn),輸入輔出壓力符合即為合格從他們內(nèi)部結(jié)構(gòu)看,伺服閥多是零遮蓋,比例閥則有一定的死區(qū),控制精度要低,向應(yīng)要慢 設(shè)計(jì)中就使比例電磁鐵的銜鐵在這段行程中工作D31FWE02CC4NLW0
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