?AZPF-12-008LSA20MB

武穴黎翔機(jī)電設(shè)備有限公司，詢價(jià)聯(lián)系人：何女士

詢價(jià)電話：0713-6542758，手機(jī)：18934630908????

詢價(jià)傳真：0713-6542758

詢價(jià)QQ:?736567721,704552157

現(xiàn)貨特價(jià)型號：R900925687?4WRAE10W1-30-22/G24N9K31/F1V??2臺

0811402141?DBETBEX-1X/315G24K31F1M?????2臺

由于電磁鐵推力的限制，在大于63L/min的液壓系統(tǒng)中，一般不再選用直推式的電磁換向閥，而選用通過流量較大的電液換向閥。電液換向閥的原理是：控制油通過電磁先導(dǎo)閥到達(dá)電液閥主閥芯的兩端（即電液換向閥主閥體兩端蓋側(cè)），通過電磁先導(dǎo)閥的換向，來實(shí)現(xiàn)主閥芯的左右移動，從而開通或切斷通往執(zhí)行元件的油路，使執(zhí)行元件運(yùn)行或停止。但在打開或切斷油路的瞬間，系統(tǒng)中會產(chǎn)生相當(dāng)大的沖擊，這種沖擊會極大影響液壓系統(tǒng)中液壓元件和密封件的使用壽命。為了減小及至消除由此引起的液壓沖擊，最簡單的辦法是在該電液閥下面疊加一個(gè)P口節(jié)流閥或進(jìn)油節(jié)流式雙單向節(jié)流閥、出油節(jié)流式雙單向節(jié)流閥，以延長閥芯的換向及復(fù)位時(shí)間，從而到降低液壓沖擊的目的。下面就以彈簧復(fù)位型、三位四通中封式電液壓換向閥為例、

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PVV54-1X/139-098RB15UUMC?

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AZPF-12-011RNF20MF

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AZPF-12-014LHO30KB

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AZPF-12-014LNT20MB

AZPF-12-014LRR20KF

AZPF-12-014LRR20MB

AZPF-12-014RCB20MB

AZPF-12-014RHO20KF

AZPF-12-014RHO30KB

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對該三種疊加節(jié)流方式作簡要說明。

一、疊加一個(gè)P口可調(diào)節(jié)流閥：控制油先通過疊加可調(diào)節(jié)流閥、到達(dá)電磁先導(dǎo)閥的P口，通過電磁先導(dǎo)閥的換向及調(diào)整節(jié)流閥的開度，來實(shí)現(xiàn)主閥芯的換向延時(shí)，從而達(dá)到降低主油路與執(zhí)行元件接通時(shí)的換向沖擊。但先導(dǎo)電磁閥斷電時(shí)

上置式油箱把液壓泵等裝置安裝在有較好剛度的上蓋板上，其結(jié)構(gòu)緊湊、應(yīng)用最廣。此外還可在油箱外殼上鑄出散熱翅片，加強(qiáng)散熱效果，即提高了液壓泵的使用壽命。

側(cè)置式油箱是把液壓泵等裝置安裝在油箱旁邊，占地面積雖大，但安裝與維修都很方便，通常在系統(tǒng)流量和油箱容量較大時(shí)采用，尤其是當(dāng)一個(gè)油箱給多臺液壓泵供油時(shí)使用。因側(cè)置式油箱油位高于液壓泵吸油口，故具有較好的吸油效果。

下置式油箱是把液壓泵置于油箱底下，不僅便于安裝和維修，而且液壓泵吸入能力大為改善。

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力士樂葉片泵

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PV7-11/06-10RA01MA0-10?印度產(chǎn)

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、彈簧復(fù)位型電液換向閥主閥體兩端蓋內(nèi)的液壓油會通過先導(dǎo)電磁閥的中位與泄油口接通、主閥芯在復(fù)位彈簧的作用下會立即復(fù)位，由于主閥芯復(fù)位快、亦即切斷執(zhí)行元件油路的速度快、從而引起液壓沖擊。

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由此可見，疊加一個(gè)P口可調(diào)節(jié)流閥，只能實(shí)現(xiàn)換向接通延時(shí)、不能解決復(fù)位切斷延時(shí)。注：象油缸類的執(zhí)行元件，油缸前進(jìn)與后退時(shí)通過換向閥的流量是不一致的，油缸無桿腔與有桿腔的面積比越大、流量差距也越大，此時(shí)若想較滿意的降低執(zhí)行元件前進(jìn)與后退時(shí)的液壓沖擊，通過一個(gè)可調(diào)節(jié)流閥，恐怕是難以實(shí)現(xiàn)的。

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