液壓系統(tǒng)設(shè)計時為提高系統(tǒng)穩(wěn)定性，減少負載變化對速度的影響，要么犧牲部分我們想實現(xiàn)的功能，要么增加額外的液壓元件，如調(diào)速閥、壓力控制閥等，通過增加阻尼，提高系統(tǒng)速度剛度來提高系統(tǒng)的穩(wěn)定性。但是這樣元件的增加又會降低效率，浪費能源；還會使得整個系統(tǒng)的可靠性降低、增加成本。 R900424371 ?ZDR6DA3-4X/210Y?

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　　 （2）由于換向結(jié)構(gòu)的特殊性，使得用戶在實現(xiàn)某一功能時必須購買相應(yīng)的液壓元件，再加上工程機械廠家會根據(jù)不同最終用戶要求設(shè)計出相應(yīng)的功能，這樣會造成生產(chǎn)廠家采購?fù)?、多?guī)格的液壓控制元件來滿足不同功能要求的需要，不利于產(chǎn)品通用化及產(chǎn)品管理，同時會大大提高產(chǎn)品成本。LFA80H2-6X/F

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　　 （3）由于執(zhí)行機構(gòu)進出液壓油通過一根閥芯進行控制，單獨控制執(zhí)行機構(gòu)兩側(cè)壓力是不可能的。因此，出油側(cè)背壓作用于執(zhí)行機構(gòu)運動的反方向，隨著出油側(cè)背壓升高，為保質(zhì)執(zhí)行機構(gòu)的運動，必須提高進油側(cè)壓力。這樣會使得液壓系統(tǒng)消耗的功能增加，效率低，發(fā)熱增加。 一步升高。

彈簧腔經(jīng)孔至洞口T（Y）由外部泄油至油箱。壓力表接口用于閥的二次壓力監(jiān)測。

DP和DB型

在DP型中，油口P1減壓。信號和控制油從油口P1內(nèi)部提供。在DB型中，油口P1減壓但控制油取自B。

注意！

在DB型中，當方向閥處于P至A位置時，必須確保油口B的壓力不高于設(shè)定壓力。否則油口的壓力將降低。

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　　 采用雙閥芯技術(shù)的液壓系統(tǒng)，由于執(zhí)行機構(gòu)進出油側(cè)閥口閥芯位置及控制方式各自獨立，互不影響，這樣通過對兩閥芯控制方式的不同組合，利用軟件編程能很好解決傳統(tǒng)單閥系統(tǒng)不能解決的問題，同時還可以輕易實現(xiàn)傳統(tǒng)液壓系統(tǒng)中難以實現(xiàn)的功能。?

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? ? ? 在驅(qū)動軸驅(qū)動軸 （1） 的齒上安裝有轉(zhuǎn)子 （2），它在定子環(huán) （3） 內(nèi)回轉(zhuǎn)。葉片 （4） 安裝在轉(zhuǎn)子槽內(nèi)，轉(zhuǎn)子轉(zhuǎn)動時靠離心力使葉片壓在定子環(huán)的內(nèi)表面。排油腔的端面由配油盤 （5） 密封。由于定子環(huán)是雙偏心結(jié)構(gòu)，因此形成對稱布置的兩個吸油區(qū)和兩個壓油區(qū)，因此傳動軸的徑向液壓力相互平衡而卸載。軸僅傳遞驅(qū)動轉(zhuǎn)矩。在吸油區(qū)，葉片部分地卸荷。這能減少磨損和獲得高效率。取下端蓋 （6），可以更換泵芯 （由轉(zhuǎn)子、葉片、定子環(huán)和配油盤組成），而不必從鐘形罩上卸下泵體 （7）。這樣就能迅速地對泵進行維護和修理。

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