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美國(guó)派克PARKER液壓閥 液壓閥(即控制元件)在液壓系統(tǒng)中控制和調(diào)節(jié)液體的壓力、流量和方向。根據(jù)控制功能的不同，液壓閥可分為村力控制閥、流量控制閥和方向控制閥。壓力控制閥又分為益流閥(安全閥)、減壓閥、順序閥、壓力繼電器等;流量控制閥包括節(jié)流閥、調(diào)整閥、分流集流閥等;方向控制閥包括單向閥、液控單向閥、梭閥、換向閥等。根據(jù)控制方式不同，液壓閥可分為開(kāi)關(guān)式控制閥、定值控制閥和比例控制閥。
????液壓閥可分為普通液壓控制閥、伺服控制閥、比例控制閥。根據(jù)安裝形式不同，液壓閥還可分為管式、板式和插裝式等若干種。液壓閥的基本結(jié)構(gòu)主要包括閥芯、閥體和驅(qū)動(dòng)閥芯在閥體內(nèi)做相對(duì)運(yùn)動(dòng)的操縱裝置。閥芯的主要形式有滑閥、錐閥和球閥；閥體上除有與閥芯配合的閥體孔或閥座孔外，還有外接油管的進(jìn)、出油口和泄油口；驅(qū)動(dòng)閥芯在閥體內(nèi)做相對(duì)運(yùn)動(dòng)的裝置可以是手調(diào)機(jī)構(gòu)，也可以是彈簧或電磁鐵，有些場(chǎng)合還采用液壓力驅(qū)動(dòng)。
????在工作原理上，液壓閥是利用閥芯在閥體內(nèi)的相對(duì)運(yùn)動(dòng)來(lái)控制閥口的通斷及開(kāi)口的大小，以實(shí)現(xiàn)壓力、流量和方向控制。液壓閥工作時(shí)，所有閥的閥口大小、閥進(jìn)、出油口間的壓差以及通過(guò)閥的流量之間的關(guān)系都符合孔口流量公式(q＝KA·Δp m)，只是各種閥控制的參數(shù)各不相同而已。
????液壓閥的基本要求：
????動(dòng)作靈敏、使用可靠，工作時(shí)沖擊振動(dòng)小。
????液流通過(guò)時(shí)壓力損失小。
????密封性能好。
????結(jié)構(gòu)緊湊，安裝、調(diào)節(jié)、使用、維護(hù)方便，通用性和互換型號(hào)。7321KBY6320AL4D400Q3
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化工儀器網(wǎng)