壓力變送器在測試的時(shí)候也有很多的因素影響，首先是被測介質(zhì)的兩種壓力通入高、低兩壓力室，低壓室壓力采用大氣壓或真空，作用在δ元件(即敏感元件)的兩側(cè)隔離膜片上，通過隔離片和元件內(nèi)的填充液傳送到測量膜片兩側(cè)。壓力變送器是由測量膜片與兩側(cè)絕緣片上的電極各組成一個(gè)電容器。 當(dāng)兩側(cè)壓力不一致時(shí)，致使測量膜片產(chǎn)生位移，其位移量和壓力差成正比，故兩側(cè)電容量就不等，通過振蕩和解調(diào)環(huán)節(jié)，轉(zhuǎn)換成與壓力成正比的信號。
Rexroth力士樂壓力閥
直動(dòng)式溢流閥：DBD，KDB
先導(dǎo)式溢流閥：ZDB，Z2DB，ZDBK，Z2DBK，DBA，
? ? ? ? ? ? ? DBAW，DBAE，DB，DBW
直動(dòng)式減壓閥：DR6DP，DR10DP，ZDR，DR-4X，
? ? ? ? ? ? ? DR-5X，DR10K，DRHD，ZDRHD，KRD
先導(dǎo)式減壓閥：ZDR10V，ZDRK6V，ZDRK10V，KTV，DR
順 序 閥： ?ZD6D，ZD10D，DZ10，DZ25，DZ32
壓力截止閥： ? ?DA，KAV
DR20-5-5X/200Y、DR20-5-5X/315Y、DR30-5-5X/100Y、DR30-5-5X/200Y
DR30-5-5X/315Y
?
先導(dǎo)式減壓閥（DR10K）：
DR10K5-3X/50YM、DR10K5-3X/100YM、DR10K5-3X/200YM、DR10K5-3X/315YM
?
先導(dǎo)式減壓閥（ZDR10）：
ZDR10VA5-3X/50Y、ZDR10VA5-3X/100Y、ZDR10VA5-3X/200Y、ZDR10VB5-3X/100Y
ZDR10VB5-3X/200Y、ZDR10VP5-3X/100YM、ZDR10VP5-3X/200YM、ZDR10VP5-3X/315YM
?
先導(dǎo)式減壓閥（ZDRK6VP）：
ZDRK6VP5-1X/50YMV、ZDRK6VP5-1X/100YMV、ZDRK6VP5-1X/210YMV
?
先導(dǎo)式減壓閥（ZDRK10V）：
ZDRK10VA5-1X/50YV、ZDRK10VA5-1X/100YV、ZDRK10VA5-1X/210YV
ZDRK10VB5-1X/50YV、ZDRK10VB5-1X/100YV、ZDRK10VB5-1X/210YV
ZDRK10VP5-1X/50YMV、ZDRK10VP5-1X/100YMV、ZDRK10VP5-1X/210YMV
規(guī)格6和10
安裝面按DIN24340A型和ISO4401
控制流量的方向和大小
用于位置、速度和壓力的閉環(huán)控制
通過控制電磁鐵觸發(fā)
通過感應(yīng)位置檢測器對控制滑閥進(jìn)行位置傳感
集成電控器（OBE），用于4WRPEH
特性曲線帶或不帶變化
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0811403017 4WRBA10EA75-2X/G24K4/M-828
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0811404043 4WRPH6C3B25P-2X/G24Z4/M
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0811404059 4WRPH10C3B100L-2X/G24Z4/M
0811404060 4WRPH10C4B50L-2X/G24Z4/M
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0811404079 4WRPH10C5B100P-2X/G24Z4/M
0811404080 4WRP10W63S-1X/G24Z4/M
0811404104 4WRP6C3B02L-1X/G24Z4/M
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0811404115 4WRBA6E15-2X/G24N9Z4/M
0811404122 4WRPH6C3B04L-1X/G24Z4/M
0811404123 4WRBA6E07-2X/G24N9Z4/M
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0811404141 4WRPE6E32SJ-2X/G24K0/A1M
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0811404183 4WRL10W80S-3X/G24Z4/M
0811404188 4WRL10W80S-3X/G24ETZ4/M
0811404207 4WRL16V200M-3X/G24Z4/M
0811404209 4WRL16WZ180S-3X/G24Z4/M
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R901195742 4WRZ16EA150-7X/6EG24N9ETK4/M-674
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R978919859 4WRZ10E85-7X/6EG24N9TK4/M
R910991713
4WRA6V30-2X/G24N9Z4/V-589
常用液壓名稱\名詞解釋
電磁閥（Electromagnetic valve）是用電磁控制的工業(yè)設(shè)備，是用來控制流體的自動(dòng)化基礎(chǔ)元件，屬于執(zhí)行器，并不限于液壓、氣動(dòng)。用在工業(yè)控制系統(tǒng)中調(diào)整介質(zhì)的方向、流量、速度和其他的參數(shù)。電磁閥可以配合不同的電路來實(shí)現(xiàn)預(yù)期的控制，而控制的精度和靈活性都能夠保證。電磁閥有很多種，不同的電磁閥在控制系統(tǒng)的不同位置發(fā)揮作用，最常用的是單向閥、安全閥、方向控制閥、速度調(diào)節(jié)閥等。
電磁閥里有密閉的腔，在不同位置開有通孔，每個(gè)孔連接不同的油管，腔中間是活塞，兩面是兩塊電磁鐵，哪面的磁鐵線圈通電閥體就會被吸引到哪邊，通過控制閥體的移動(dòng)來開啟或關(guān)閉不同的排油孔，而進(jìn)油孔是常開的，液壓油就會進(jìn)入不同的排油管，然后通過油的壓力來推動(dòng)油缸的活塞，活塞又帶動(dòng)活塞桿，活塞桿帶動(dòng)
機(jī)械裝置。這樣通過控制電磁鐵的電流通斷就控制了機(jī)械運(yùn)動(dòng)。
柱塞泵是液壓系統(tǒng)的一個(gè)重要裝置。它依靠柱塞在缸體中往復(fù)運(yùn)動(dòng)，使密封工作容腔的容積發(fā)生變化來實(shí)現(xiàn)吸油、壓油。柱塞泵具有額定壓力高、結(jié)構(gòu)緊湊、效率高和流量調(diào)節(jié)方便等優(yōu)點(diǎn)，被廣泛應(yīng)用于高壓、大流量和流量需要調(diào)節(jié)的場合，諸如液壓機(jī)、工程機(jī)械和船舶中。機(jī)械分類 ? 軸向式 ? 直軸斜盤式 ?? 徑向式 ? 液壓式 柱塞泵一般分為單柱塞泵、臥式柱塞泵、軸向柱塞泵和徑向柱塞泵。
比例閥 閥對流量的控制可以分為兩種：
一種是開關(guān)控制：要么全開、要么全關(guān)，流量要么最大、要么最小，沒有中間狀態(tài)，如普通的電磁直通閥、電磁換向閥、電液換向閥。
另一種是連續(xù)控制：閥口可以根據(jù)需要打開任意一個(gè)開度，由此控制通過流量的大小，這類閥有手動(dòng)控制的，如節(jié)流閥，也有電控的，如比例閥、伺服閥。
所以使用比例閥或伺服閥的目的就是：以電控方式實(shí)現(xiàn)對流量的節(jié)流控制（當(dāng)然經(jīng)過結(jié)構(gòu)上的改動(dòng)也可實(shí)現(xiàn)壓力控制等），既然是節(jié)流控制，就必然有能量損失，伺服閥和其它閥不同的是，它的能量損失更大一些，因?yàn)樗枰欢ǖ牧髁縼砭S持前置級控制油路的工作。
換向閥是具有兩種以上流動(dòng)形式和兩個(gè)以上油口的方向控制閥。是實(shí)現(xiàn)液壓油流的溝通、切斷和換向，以及壓力卸載和順序動(dòng)作控制的閥門。
可分為手動(dòng)換向閥、電磁換向閥、電液換向閥等。
又稱克里斯閥，閥門的一種，具有多向可調(diào)的通道，可適時(shí)改變流體流向。
工作時(shí)借著閥外的驅(qū)動(dòng)傳動(dòng)機(jī)構(gòu)轉(zhuǎn)動(dòng)驅(qū)動(dòng)軸，帶動(dòng)搖拐臂，啟動(dòng)閥板，使工作流體時(shí)而從左入口通向閥的下部出口，時(shí)而從右入口變換通向下部出口，實(shí)現(xiàn)了周期變換流向的目的。
這種變換閥在石油、化工生產(chǎn)中有著廣泛的應(yīng)用，在合成氨造氣系統(tǒng)中最為常用。此外，換向閥還可作成閥瓣式的結(jié)構(gòu)，多用于較小流量的場合。工作時(shí)只需轉(zhuǎn)動(dòng)手輪通過閥瓣來變換工作流體的流向。
溢流閥是一種液壓壓力控制閥，在液壓設(shè)備中主要起定壓溢流作用，穩(wěn)壓，系統(tǒng)卸荷和安全保護(hù)作用。
主要作用編輯定壓溢流作用：在定量泵節(jié)流調(diào)節(jié)系統(tǒng)中，定量泵提供的是恒定流量。當(dāng)系統(tǒng)壓力增大時(shí)，會使流量需求減小。此時(shí)溢流閥開啟，使多余流量溢回油箱，保證溢流閥進(jìn)口壓力，即泵出口壓力恒定（閥口常隨壓力波動(dòng)開啟）。
節(jié)流閥是通過改變節(jié)流截面或節(jié)流長度以控制流體流量的閥門。將節(jié)流閥和單向閥并聯(lián)則可組合成單向節(jié)流閥。節(jié)流閥和單向節(jié)流閥是簡易的流量控制閥，在定量泵液壓系統(tǒng)中，節(jié)流閥和溢流閥配合，可組成三種節(jié)流調(diào)速系統(tǒng)，即進(jìn)油路節(jié)流調(diào)速系統(tǒng)、回油路節(jié)流調(diào)速系統(tǒng)和旁路節(jié)流調(diào)速系統(tǒng)。節(jié)流閥沒有流量負(fù)反饋功能，不能補(bǔ)償由負(fù)載變化所造成的速度不穩(wěn)定，一般僅用于負(fù)載變化不大或?qū)λ俣确€(wěn)定性要求不高的場合。
齒輪泵是依靠泵缸與嚙合齒輪間所形成的工作容積變化和移動(dòng)來輸送液體或使之增壓的回轉(zhuǎn)泵。由兩個(gè)齒輪、泵體與前后蓋組成兩個(gè)封閉空間，當(dāng)齒輪轉(zhuǎn)動(dòng)時(shí)，齒輪脫開側(cè)的空間的體積從小變大，形成真空，將液體吸入，齒輪嚙合側(cè)的空間的體積從大變小，而將液體擠入管路中去。吸入腔與排出腔是靠兩個(gè)齒輪的嚙合線來隔開的。齒輪泵的排出口的壓力完全取決于泵出處阻力的大小。
葉片泵因?yàn)闅v史的葉片泵根據(jù)中類型的不同有兩種
一）專門指容積泵中的滑片泵。
二）指動(dòng)力式泵的三泵（離心泵、混流泵、軸流泵）或其他特殊的泵。
這類泵產(chǎn)品一般不會叫葉片泵。但作為專著，葉片泵幾乎全部是指離心泵、混流泵、軸流泵等。
根據(jù)其每轉(zhuǎn)的理論排量是固定值還是可變值，可以分為葉片式變量泵和葉片式定量泵。
工作原理編輯葉片泵轉(zhuǎn)子旋轉(zhuǎn)時(shí)，葉片在離心力和壓力油的作用下，尖部緊貼在定子內(nèi)表面上。這樣兩個(gè)葉片與轉(zhuǎn)子和定子內(nèi)表面所構(gòu)成的工作容積，先由小到大吸油后再由大到小排油，葉片旋轉(zhuǎn)一周時(shí)，完成兩次吸油與排油。
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單向閥是流體只能沿進(jìn)口流動(dòng)，出口介質(zhì)卻無法回流的裝置
單向閥 Check Valve?
單向閥又稱止回閥或逆止閥。用于液壓系統(tǒng)中防止油流反向流動(dòng),或者用于氣動(dòng)系統(tǒng)中防止壓縮空氣逆向流動(dòng)。
單向閥有直通式和直角式兩種。直通式單向閥用螺紋連接安裝在管路上。直角式單向閥有螺紋連接、板式連接和法蘭連接三種形式。液控單向閥也稱閉鎖閥或保壓閥，它與單向閥相同，用以防止油液反向流動(dòng)。但在液壓回路中需要油流反向流動(dòng)時(shí)又可利用控制油壓，打開單向閥，使油流在兩個(gè)方向都可流動(dòng)。液控單向閥采用錐形閥芯，因此密封性能好。在要求封閉油路時(shí)，可用此閥作為油路的單向鎖緊而起保壓作用。液控單向閥控制油的泄漏方式有內(nèi)泄式和外泄式二種。在油流反向出口無背壓的油路中可用內(nèi)泄式；否則需用外泄式，以降低控制油壓力。
壓力繼電器，液壓術(shù)語，是液壓系統(tǒng)中當(dāng)流體壓力達(dá)到預(yù)定值時(shí)，使電接點(diǎn)動(dòng)作的元件。
2.是將壓力轉(zhuǎn)換成電信號的液壓元器件，客戶根據(jù)自身的壓力設(shè)計(jì)需要，通過調(diào)節(jié)壓力繼電器，實(shí)現(xiàn)在某一設(shè)定的壓力時(shí)，輸出一個(gè)電信號的功能。
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