?根據(jù)不同的工作壓力和工作環(huán)境，在液壓系統(tǒng)中選用不同型號(hào)液壓泵，可以提高液壓系統(tǒng)的工作效率和穩(wěn)定性，節(jié)省能量，提高產(chǎn)品質(zhì)量和產(chǎn)品競(jìng)爭(zhēng)力此外，液壓回流泵是一種新型節(jié)能產(chǎn)品由于回流泵體積小、重量輕，而效率高，因而能廣泛用于各種流體工程機(jī)械中。
這類泵的結(jié)構(gòu)簡(jiǎn)單：油封和泵內(nèi)均為一體成型的金屬材料制成（根據(jù)材質(zhì)不同分為鑄造精密泵、玻璃鋼精密泵等）這樣不但可以減少油封的損壞，而且由于流體工程機(jī)械中泵內(nèi)的壓力表處于真空狀態(tài)，泵內(nèi)無(wú)氣，泵內(nèi)介質(zhì)較少，相對(duì)地減小了體積和重量；油泵有真空泵、真空流量調(diào)整裝置和真空輔助裝置等部件；另外由于液體是靜止的和流動(dòng)的，不需要潤(rùn)滑，因此在設(shè)計(jì)、制造時(shí)都很省油。
低噪聲，無(wú)污染，有良好的耐溫性能，并能改善電機(jī)的運(yùn)行特性，可在苛刻條件下工作噪音極小，不會(huì)污染工作環(huán)境效率高流量能控制在標(biāo)準(zhǔn)規(guī)格范圍內(nèi)低功耗運(yùn)行平穩(wěn) 由于油泵的輸入油量與出口油量一致，因此可根據(jù)用戶需要靈活地調(diào)節(jié)其流量。
這種泵的主要特點(diǎn)是，對(duì)壓力調(diào)節(jié)范圍較大，且不受流量限制，且不需要對(duì)設(shè)備進(jìn)行改造如無(wú)液流量監(jiān)測(cè)系統(tǒng)或儀表裝置，壓力過(guò)高時(shí)只能調(diào)整油壓；壓力過(guò)低時(shí)則又需增加液量泵的主要結(jié)構(gòu)是：用彈簧來(lái)保持動(dòng)平衡以防止振動(dòng)；泵腔里有若干個(gè)工作腔。
活塞在運(yùn)動(dòng)中產(chǎn)生著巨大的推力并將其作用于氣缸壁而產(chǎn)生著反作用力當(dāng)活塞受到徑向力時(shí)就會(huì)有一部分被吸進(jìn)氣缸內(nèi)，另一部分又通過(guò)一個(gè)工作腔繼續(xù)運(yùn)動(dòng)，所以活塞向外產(chǎn)生著作用力；活塞在缸蓋內(nèi)運(yùn)動(dòng)時(shí)，其行程相當(dāng)于泵的輸出量（流量）的百分比。
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