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液壓比例控制系統
以比例控制元件完成動力與運動方向控制，分為比例壓力閥、比例流量閥、比例方向閥及比例方向流量閥，可為模擬量輸入或數字量輸入，視是否帶反饋分為開環控制與閉環控制，一般獲得頻率不是很高(10HZ)以內，高頻響閥可實現較高頻率。
若精度要求不高可考慮使用電液比例控制系統，一般電液比例控制系統可達至以下精度
位置精度- 3 mm
速度精度帶壓力補償器- 3%
加減速斜坡時間-0.5秒
壓力帶位移傳感器的產品-比例壓力閥設定的0.3% (如壓力設定為200bar,精度可達0.6bar)
一般的多驅動器液壓系統皆要求流量及壓力控制，提供比例壓力及流量控制系統
開環式比例壓力及流量控制可用于定量泵及變量泵系統。
速度和流量比例控制的分別是:
流量控制只控制供油量,并不控制驅動元件的運動方向;
若系統負載及變速要求高，則要使用速度控制系統。
速度比例控制多用于自動化控制、注塑機、壓力機等
使用閉環的主要原因:
保持設定值不受外來干擾所影響
→在不同的工作壓力下保持穩定的速度
→在不同的輸出力下保證相同位置
→在帶偏載的情況下作同步移動
提高精度要求
→位置誤差低于1 mm
→壓力誤差低于1 ba
→需要控制加減速度
高動態要求的系統
→模擬應用
→測驗應用


液壓伺服控制系統
以伺服控制元件完成動力與運動方向控制，綜合壓力、流量、方向控制為一體，利用偏差控制進行糾偏，以滿足精度控制需要，必須為閉環控制，可實現較高頻率( 100HZ以上) ,有滑閥式、噴嘴擋板式、射流管式等，常采用機械伺服、電液伺服、氣液伺服。

液壓伺服系統分類:
(1)按輸入的信號變化規律分類:定值控制系統、程序控制系統和伺服系統三類。當系統輸入信號為定值時，稱為定值控制系統，其基本任務是提高系統的抗干擾能力。當系統的輸入信號按預先給定的規律變化時，稱為程序控制系統。伺服系統也稱為隨動系統，其輸入信號是時間的未知函數，輸出量能夠準確、迅速地復現輸入量的變化規律。
(2)按輸入信號的不同分類:機液伺服系統、電液伺服系統、氣液伺服系統等。
(3)按輸出的物理量分類:位置伺服系統、速度伺服系統、力(或壓力)伺服系統等。
(4)按控制元件分類:閥控系統和泵控系統。在機械設備中，閥控系統應用較多。


液壓伺服系統的特點如下:
(1)反饋。把輸出量的一部分或全部按一定方式回送到輸入端，并和輸入信號進行比較，這就是反饋。在上例中，反饋(測速裝置輸出)電壓和給定(輸入信號)電壓是異號的，即反饋信號不斷地抵消輸入信號，這是負反饋。自動控制系統大多數是負反饋。
(2)偏差。要使液壓缸輸出一定的力和速度，伺服閥必須有一定的開口量，因此輸入和輸出之間必須有偏差信號。液壓缸運動的結果又力圖消除這個誤差。但在伺服系統工作的任何時刻都不能完全消除這一-偏差，伺服系統正是依靠這一-偏差信號進行工作的。
(3)放大。執行元件(液壓缸)輸出的力和功率遠遠大于輸入信號的力和功率，其輸出的能量是液壓能源供給的。
(4)跟蹤。液壓缸的輸出量完全跟蹤輸入信號的變化。



電液比例閥是比例控制系統中的主要功率放大元件,按輸入電信號指令連續地成比例地控制液壓系統的壓辦流量等參數。與伺服控制系統中的伺服閥相比,在某些方面還有一定的性能差距(主要性能比較如表1所示),但它顯著的優點是抗污染能力強,大大地減少了由污染而造成的工作故障,提高了液壓系統的工作穩定性和可靠性。另一方面比例閥的成本比伺服閥低，結構也簡單,已在許多場合獲得廣泛應用。

比例閥按功能分為三大類
(1)比例壓力閥。有溢流閥減壓閥,分別有直動和先導兩種結構;可連續地或按比例地遠程控制其輸出油液壓力;
(2)比例換向閥。有直動和先導兩種結構,直動閥有帶位移傳感器和不帶位移傳感器兩類。由于使用了比例電磁鐵閥芯不僅可以換位，而且換位的行程可以連續地或按比例地變化。因而連通油口間的通流面積也可以連續或按比例地變化。所以比例換向閥不僅能夠控制執行元件的方向而且能夠控制其速度。因為這個原因比例閥中的比例換向閥應用也普遍;
(3)比例流量閥。有比例調速閥和比例溢流流量控制閥,可連續地或按比例地遠程控制其輸出流量。
比例閥的輸入單元是電-機械轉換器,它將輸入的電信號轉換成機械量轉換器有伺服電機和步進電機力馬達和力矩馬達比例電磁鐵等形式。但常用的比例閥大都采用了比例電磁鐵，比例電磁鐵根據電磁原理設計,能使其產生的機械量(力或力矩和位移)與輸入電信號(電流)的大小成比例,再連續地控制液壓閥閥芯的位置，進而實現連續地控制液壓系統的壓力方向和流量。比例電磁鐵的結構，它由線圈、銜鐵推桿等組成,當有信號輸入線圈時,線圈內磁場對銜鐵產生作用力,銜鐵在磁場中按信號電流的大小和方向成比例連續地運動,再通過固連在一起的銷釘帶動推桿運動,從而控制滑閥閥芯的運動。應用的比例電磁鐵是耐高壓直流比例電磁鐵。

比例電磁鐵的類型按照工作原理主要分為
如下幾類:
(1)力控制型
這類電磁鐵的行程短，只有1 5mm,輸出力與輸入電流成正比,常用在比例閥的先導控制級
上:
(2)行程控制型
由力控制型加負載彈簧共同組成，電磁鐵輸出的力通過彈簧轉換成輸出位移,輸出位移與輸入電流成正比，工作行程達3mm,線性好，可以用在直控式比例閥上;
(3)位置調節型
銜鐵的位置由傳感器檢測后,發出一個閥內反饋信號,在閥內進行比較后重新調節銜鐵的位置。閥內形成閉環控制,精度高,銜鐵的位置與力
無關，精度高的比例閥如德國的博世意大利的阿托斯等都采用這種結構。
比例閥與放大器配套使用放大器采用電流負反饋,設置斜坡信號發生器階躍函數發生器、PD調節器反向器等,控制升壓降壓時間或運動加速度及減速度。斷電時, 能使閥芯處于安全位置。
比例電磁鐵和液壓閥組成電液比例閥。由于比例電磁鐵可以在不同的電流下得到不同的力(或行程),因此可以無級改變壓力、流量。故比例電磁鐵是比例閥的關鍵元件。
REXROTH兩位四通比例閥4WRA10EA00-22/G24K4/V-828
力士樂REXROTH比例、高頻響應和伺服閥
力士樂REXROTH比例方向閥
力士樂REXROTH比例方向閥，直動式
力士樂REXROTH二位四通和三位四通比例方向閥直控式，閥芯不帶位移電反饋，不帶集成式放大版（OBE）4WRA
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R978919010 4WRA6X30-23/G24N9K4/V-874
R978916415 4WRA10EA30-23/G24N9K4/VSO43A-1681
R978009437 4WRA10W1-60-23/G24N9K4/VSO43A-1779
R902650718 DIR.-CONTROLVALVE 4WRA6E07-23/G24NJK&
R902650387 DIR.-CONTROLVALVE 4WRA6E30-23/G24N9K&
R902416026 DIR.-CONTROLVALVE 4WRA6E30-23/G24N9Z&
R910988077 DIR.-CONTROLVALVE 4WRA6V15-23/G24N9K&
R910991712 DIR.-CONTROLVALVE 4WRA6V30-23/G24N9K&
R910988078 DIR.-CONTROLVALVE 4WRA10V30-23/G24N9K4&
R910988165 DIR.-CONTROLVALVE 4WRA10V30-23/G24N9Z4&
R902435562 DIR.-CONTROLVALVE 4WRA6EO7-23/G24NJK31&
力士樂REXROTH二位四通和三位四通比例方向閥直控式，閥芯不帶位移電反饋，帶集成式放大版（OBE）4WRAE
R900954084 4WRAE10E1-30-2X/G24K31/A1V
R901311329 4WRAE10E1-30-2X/G24K31/F1V
R900936848 4WRAE10E1-30-2X/G24N9K31/A1V
R901213358 4WRAE10E1-30-2X/G24N9K31/F1V
R900921596 4WRAE10E1-30-2X/G24N9Z31/A1V
R900954409 4WRAE10E1-60-2X/G24K31/A1V
R901049206 4WRAE10E1-60-2X/G24K31/F1V
R900909658 4WRAE10E1-60-2X/G24N9K31/A1V
R901384952 4WRAE10E1-60-2X/G24N9K31/F1M
R900773932 4WRAE10E1-60-2X/G24N9K31/F1V
R900904991 4WRAE10E1-60-2X/G24N9Z31/A1V
R978016005 4WRAE10E3-60-2X/G24N9K31/A1V
R900933793 4WRAE10E30-2X/G24K31/A1V
R901026395 4WRAE10E30-2X/G24K31/F1V
R900920588 4WRAE10E30-2X/G24N9K31/A1V
R900904010 4WRAE10E30-2X/G24N9K31/F1V
R900570901 4WRAE10E30-2X/G24N9Z31/A1V
R900934721 4WRAE10E30-2X/G24Z31/A1V
R900954083 4WRAE10E60-2X/G24K31/A1V
R900965674 4WRAE10E60-2X/G24K31/F1V
R900558356 4WRAE10E60-2X/G24N9K31/A1V
R901038922 4WRAE10E60-2X/G24N9K31/A1V-280
R900929318 4WRAE10E60-2X/G24N9K31/F1V
R900572096 4WRAE10E60-2X/G24N9Z31/A1V
R900908419 4WRAE10E60-2X/G24N9Z31/F1V
R900954085 4WRAE10EA30-2X/G24K31/A1V
R900940206 4WRAE10EA30-2X/G24N9K31/A1V
R900954109 4WRAE10EA30-2X/G24N9K31/F1V
R900914273 4WRAE10EA30-2X/G24N9Z31/A1V
R900954086 4WRAE10EA60-2X/G24K31/A1V
R900786039 4WRAE10EA60-2X/G24K31/F1V
R900916601 4WRAE10EA60-2X/G24N9K31/A1V
R900930423 4WRAE10EA60-2X/G24N9K31/F1V
R900546669 4WRAE10EA60-2X/G24N9Z31/A1V
R900939576 4WRAE10EB30-2X/G24N9K31/A1V
R900906761 4WRAE10EB30-2X/G24N9Z31/A1V
R900926473 4WRAE10EB60-2X/G24N9K31/A1V
R901316266 4WRAE10EB60-2X/G24N9K31/F1V
R900551277 4WRAE10EB60-2X/G24N9Z31/A1V
R900913578 4WRAE10V60-2X/G24N9Z31/A1V
R900953496 4WRAE10W1-30-2X/G24K31/A1V
R900707215 4WRAE10W1-30-2X/G24K31/F1V
R900555967 4WRAE10W1-30-2X/G24N9K31/A1V
R900925687 4WRAE10W1-30-2X/G24N9K31/F1V
R900912261 4WRAE10W1-30-2X/G24N9Z31/A1V
R900954089 4WRAE10W1-60-2X/G24K31/A1V
R900732536 4WRAE10W1-60-2X/G24K31/F1V
R900936006 4WRAE10W1-60-2X/G24N9K31/A1V
R900949757 4WRAE10W1-60-2X/G24N9K31/F1V
R900909337 4WRAE10W1-60-2X/G24N9Z31/A1V
R900961942 4WRAE10W3-30-2X/G24N9K31/A1V
R978011121 4WRAE10W3-60-2X/G24K31/F1V
R900946871 4WRAE10W3-60-2X/G24N9K31/A1V
R900968832 4WRAE10W3-60-2X/G24N9K31/F1V
R900911320 4WRAE10W3-60-2X/G24N9Z31/A1V
R900954087 4WRAE10W30-2X/G24K31/A1V
R901059583 4WRAE10W30-2X/G24K31/A1V-280
R900711868 4WRAE10W30-2X/G24K31/F1V
R900913646 4WRAE10W30-2X/G24N9K31/A1V
R900922439 4WRAE10W30-2X/G24N9K31/F1V
R900900163 4WRAE10W30-2X/G24N9Z31/A1V
R900954088 4WRAE10W60-2X/G24K31/A1V
R901369568 4WRAE10W60-2X/G24K31/F1M
R900710530 4WRAE10W60-2X/G24K31/F1V
R901416065 4WRAE10W60-2X/G24N9K31/A1M
R900900988 4WRAE10W60-2X/G24N9K31/A1V
R900974924 4WRAE10W60-2X/G24N9K31/A1V-280
R900920055 4WRAE10W60-2X/G24N9K31/F1V
R900570097 4WRAE10W60-2X/G24N9Z31/A1V
R901239551 4WRAE10W60-2X=G24N9K31/F1V
R900954090 4WRAE10WA30-2X/G24K31/A1V
R900901949 4WRAE10WA30-2X/G24N9Z31/A1V
R900954091 4WRAE10WA60-2X/G24K31/A1V
R900904801 4WRAE10WA60-2X/G24N9K31/A1V
R901151668 4WRAE10WA60-2X/G24N9K31/F1V
R900966303 4WRAE10WB30-2X/G24K31/A1V
R901239201 4WRAE10WB30-2X/G24N9K31/F1V
R978019392 4WRAE10WB60-2X/G24N9K31/A1V
R901239457 4WRAE10WB60-2X/G24N9K31/F1V
R978916639 4WRAE6E03-2X/G24K31/A1V
R900953168 4WRAE6E03-2X/G24N9K31/A1V
R901066051 4WRAE6E03-2X/G24N9K31/F1V
R900920071 4WRAE6E03-2X/G24N9Z31/A1V
R900954069 4WRAE6E07-2X/G24K31/A1V
R901201706 4WRAE6E07-2X/G24K31/A1V-280
R900759329 4WRAE6E07-2X/G24K31/F1V
R900925006 4WRAE6E07-2X/G24N9K31/A1V
R901130352 4WRAE6E07-2X/G24N9K31/A1V-280
R900925456 4WRAE6E07-2X/G24N9K31/F1V
R900912300 4WRAE6E07-2X/G24N9Z31/A1V
R901015564 4WRAE6E1-07-2X/G24K31/A1V
R900617493 4WRAE6E1-07-2X/G24K31/F1V
R901355164 4WRAE6E1-07-2X/G24N9K31/A1V
R900711880 4WRAE6E1-07-2X/G24N9K31/F1V
R900954072 4WRAE6E1-15-2X/G24K31/A1V
R900738355 4WRAE6E1-15-2X/G24K31/F1V
R900753599 4WRAE6E1-15-2X/G24N9K31/A1V
R900954073 4WRAE6E1-30-2X/G24K31/A1V
R900928872 4WRAE6E1-30-2X/G24N9K31/A1V
R900947058 4WRAE6E1-30-2X/G24N9K31/F1V
R900954070 4WRAE6E15-2X/G24K31/A1V
R901282085 4WRAE6E15-2X/G24K31/A1V-280
R901019997 4WRAE6E15-2X/G24K31/F1V
R900909389 4WRAE6E15-2X/G24N9K31/A1V
R900947059 4WRAE6E15-2X/G24N9K31/F1V
R900553353 4WRAE6E15-2X/G24N9Z31/A1V
R900957274 4WRAE6E3-30-2X/G24N9K31/F1V
R900954071 4WRAE6E30-2X/G24K31/A1V
R901015613 4WRAE6E30-2X/G24K31/F1V
R900558355 4WRAE6E30-2X/G24N9K31/A1V
R900974925 4WRAE6E30-2X/G24N9K31/A1V-280
R900931485 4WRAE6E30-2X/G24N9K31/F1V
R900552113 4WRAE6E30-2X/G24N9Z31/A1V
R900920810 4WRAE6E30-2X/G24N9Z31/F1V
R900745630 4WRAE6EA07-2X/G24K31/A1V
R900966133 4WRAE6EA07-2X/G24N9K31/A1V
R900723376 4WRAE6EA07-2X/G24N9K31/F1V
R900954074 4WRAE6EA15-2X/G24K31/A1V
R901145773 4WRAE6EA15-2X/G24K31/F1V
R900750718 4WRAE6EA15-2X/G24N9K31/A1V
R900957490 4WRAE6EA15-2X/G24N9K31/F1V
R900579463 4WRAE6EA15-2X/G24N9Z31/F1V
R900954075 4WRAE6EA30-2X/G24K31/A1V
R901021332 4WRAE6EA30-2X/G24K31/F1V
R900937158 4WRAE6EA30-2X/G24N9K31/A1V
R900938373 4WRAE6EA30-2X/G24N9K31/F1V
R900916339 4WRAE6EA30-2X/G24N9Z31/A1V
R900929851 4WRAE6EB07-2X/G24N9K31/A1V
R900916594 4WRAE6EB15-2X/G24K31/A1V
R900935661 4WRAE6EB15-2X/G24N9K31/A1V
R900963738 4WRAE6EB15-2X/G24N9K31/F1V
R900969665 4WRAE6EB30-2X/G24N9K31/A1V
R900935958 4WRAE6M30-2X/G24N9K31/A1V
R900909958 4WRAE6M30-2X/G24N9Z31/A1V
R901117558 4WRAE6V03-2X/G24N9K31/A1V
R900703358 4WRAE6V07-2X/G24N9K31/A1V
R901306165 4WRAE6V07-2X/G24N9K31/F1V
R901201460 4WRAE6V1-07-2X/G24N9K31/F1V
R901201458 4WRAE6V1-15-2X/G24N9K31/F1V
R900965020 4WRAE6V1-30-2X/G24N9K31/F1V
R900577739 4WRAE6V1-30-2X/G24N9Z31/A1V
R900578084 4WRAE6V1-30-2X/G24N9Z31/F1V
R900576353 4WRAE6V1-30-2X/G24Z31/F1V
R900758996 4WRAE6V15-2X/G24K31/A1V
R901250162 4WRAE6V15-2X/G24N9K31/A1V
R900551850 4WRAE6V15-2X/G24N9Z31/A1V
R900935370 4WRAE6V30-2X/G24N9K31/A1V
R901424158 4WRAE6V30-2X/G24N9K31/F1V
R900736894 4WRAE6W03-2X/G24N9K31/A1V
R900618361 4WRAE6W03-2X/G24N9K31/F1V
R900954076 4WRAE6W07-2X/G24K31/A1V
R900778280 4WRAE6W07-2X/G24K31/F1V
R900932003 4WRAE6W07-2X/G24N9K31/A1V
R900950144 4WRAE6W07-2X/G24N9K31/F1V
R901026400 4WRAE6W1-07-2X/G24K31/A1V
R901099279 4WRAE6W1-07-2X/G24K31/F1V
R900947785 4WRAE6W1-07-2X/G24N9K31/A1V
R900958128 4WRAE6W1-07-2X/G24N9K31/F1V
R900954079 4WRAE6W1-15-2X/G24K31/A1V
R901018004 4WRAE6W1-15-2X/G24K31/F1V
R900913442 4WRAE6W1-15-2X/G24N9K31/A1V
R900950774 4WRAE6W1-15-2X/G24N9K31/F1V
R900555820 4WRAE6W1-15-2X/G24N9Z31/A1V
R900954080 4WRAE6W1-30-2X/G24K31/A1V
R900974817 4WRAE6W1-30-2X/G24K31/F1V
R900913445 4WRAE6W1-30-2X/G24N9K31/A1V
R900941258 4WRAE6W1-30-2X/G24N9K31/F1V
R900549444 4WRAE6W1-30-2X/G24N9Z31/A1V
R900954077 4WRAE6W15-2X/G24K31/A1V
R900976919 4WRAE6W15-2X/G24K31/F1V
R900908938 4WRAE6W15-2X/G24N9K31/A1V
R901290623 4WRAE6W15-2X/G24N9K31/A1V-280
R900908195 4WRAE6W15-2X/G24N9K31/F1V
R900900159 4WRAE6W15-2X/G24N9Z31/A1V
R901439515 4WRAE6W2-30-2X/G24N9K31/A1V
R900915895 4WRAE6W3-15-2X/G24N9Z31/F1V
R900975416 4WRAE6W3-30-2X/G24N9K31/A1V
R900954078 4WRAE6W30-2X/G24K31/A1V
R900762072 4WRAE6W30-2X/G24K31/F1V
R900900987 4WRAE6W30-2X/G24N9K31/A1V
R900974927 4WRAE6W30-2X/G24N9K31/A1V-280
R900943826 4WRAE6W30-2X/G24N9K31/F1V
R900557303 4WRAE6W30-2X/G24N9Z31/A1V
R900914844 4WRAE6W30-2X/G24N9Z31/A1V-612
R900786463 4WRAE6WA07-2X/G24K31/A1V
R900783251 4WRAE6WA07-2X/G24K31/F1V
R900946529 4WRAE6WA07-2X/G24N9K31/A1V
R900954081 4WRAE6WA15-2X/G24K31/A1V
R900951675 4WRAE6WA15-2X/G24N9K31/A1V
R900901182 4WRAE6WA15-2X/G24N9K31/F1V
R900905675 4WRAE6WA15-2X/G24N9Z31/A1V
R900954082 4WRAE6WA30-2X/G24K31/A1V
R901100348 4WRAE6WA30-2X/G24K31/F1V
R900962407 4WRAE6WA30-2X/G24N9K31/A1V
R900752021 4WRAE6WA30-2X/G24N9K31/F1V
R900903760 4WRAE6WA30-2X/G24N9Z31/A1V
R901170924 4WRAE6WB07-2X/G24N9K31/F1V
R900913647 4WRAE6WB15-2X/G24N9K31/A1V
R901239200 4WRAE6WB15-2X/G24N9K31/F1V
R900941851 4WRAE6WB30-2X/G24N9K31/A1V
力士樂REXROTH比例方向閥，直控式4WRA ...XE
R901158548 4WRA6E07-2X/G24XEJ/V
R901097419 4WRA6E15-2X/G24XEJ/V
R901154863 4WRA6E30-2X/G24XEJ/V
R901254509 4WRA6EA03-2X/G24XEJ/V
R901262600 4WRA6EA07-2X/G24XEJ/V
R901393419 4WRA6EA15-2X/G24XEJ/V
R901173051 4WRA6EA30-2X/G24XEJ/V
R901271117 4WRA6EB07-2X/G24XEJ/V
R901061252 4WRA6W07-2X/G24XEJ/V
R901368290 4WRA6W1-07-2X/G24XEJ/V
R901066698 4WRA6W1-15-2X/G24XEJ/V
R901028052 4WRA6W1-30-2X/G24XEJ/V
R901177023 4WRA6W15-2X/G24XEJ/V
R901053397 4WRA6W30-2X/G24XEJ/V
R901123241 4WRA6WA30-2X/G24XEJ/V
力士樂REXROTH二位四通和三位四通比例方向閥直控式，閥芯帶位移電反饋，不帶集成式放大版（OBE）4WRE
R902650795 4WRE6V32-2X/G24K4V-822
R900726605 4WRE10E1-25-2X/G24K4/V
R900954103 4WRE10E1-50-2X/G24K4/V
R900954104 4WRE10E1-75-2X/G24K4/V
R902435414 4WRE10E25-2X/24Z4/V-93
R900954100 4WRE10E25-2X/G24K4/V
R902650773 4WRE10E25-2X/G24K4V-93
R901048036 4WRE10E3-75-2X/G24K4/V
R900954101 4WRE10E50-2X/G24K4/V
R900954102 4WRE10E75-2X/G24K4/V
R901039213 4WRE10EA25-2X/G24K4/V
R900752971 4WRE10EA50-2X/G24K4/V
R900969351 4WRE10EA75-2X/G24K4/V
R900703186 4WRE10EB50-2X/G24K4/V
R901151585 4WRE10V1-25-2X/G24K4/V
R901415922 4WRE10V1-50-2X/G24K4/M
R901017446 4WRE10V1-50-2X/G24K4/V
R901414444 4WRE10V1-75-2X/G24K4/V
R900954115 4WRE10V25-2X/G24K4/V
R900954116 4WRE10V50-2X/G24K4/V
R901236220 4WRE10V50-2X=G24K4/V
R900954117 4WRE10V75-2X/G24K4/V
R900974152 4WRE10W1-25-2X/G24K4/V
R900954113 4WRE10W1-50-2X/G24K4/V
R900954114 4WRE10W1-75-2X/G24K4/V
R900954105 4WRE10W25-2X/G24K4/V
R900608420 4WRE10W3-75-2X/G24K4/V
R900954106 4WRE10W50-2X/G24K4/V
R900954107 4WRE10W75-2X/G24K4/V
R901436393 4WRE10WA25-2X/G24K4/V
R901086329 4WRE10WA50-2X/G24K4/V
R901030897 4WRE10WA75-2X/G24K4/V
R901339372 4WRE10WB75-2X/G24K4/V
R901031274 4WRE6E04-2X/G24K4/V
R900933478 4WRE6E08-2X/G24K4/V
R900968149 4WRE6E1-08-2X/G24K4/V
R900954093 4WRE6E1-16-2X/G24K4/V
R900954094 4WRE6E1-32-2X/G24K4/V
R900954092 4WRE6E16-2X/G24K4/V
R900926366 4WRE6E32-2X/G24K4/V
R900783105 4WRE6EA08-2X/G24K4/V
R900720198 4WRE6EA16-2X/G24K4/V
R900752799 4WRE6EA32-2X/G24K4/V
R901364823 4WRE6Q2-08-2X/G24K4/V
R900246943 4WRE6V04-2X/G24K4/V
R900954097 4WRE6V08-2X/G24K4/V
R902650793 4WRE6V08-2X/G24K4V-822
R900966805 4WRE6V1-16-2X/G24K4/V
R901403868 4WRE6V16-2X/G24K4/M
R900954098 4WRE6V16-2X/G24K4/V
R902651062 4WRE6V16-2X/G24K4/V-916
R902650794 4WRE6V16-2X/G24K4V-822
R900954099 4WRE6V32-2X/G24K4/V
R901246418 4WRE6W04-2X/G24K4/V
R900941264 4WRE6W08-2X/G24K4/V
R900953729 4WRE6W1-08-2X/G24K4/V
R900954095 4WRE6W1-16-2X/G24K4/V
R901236264 4WRE6W1-16-2X=G24K4/V
R900954096 4WRE6W1-32-2X/G24K4/V
R900775379 4WRE6W1-32-2X/G24K4/V=LB
R900944121 4WRE6W16-2X/G24K4/V
R900773304 4WRE6W16-2X/G24K4/V=LB
R900933480 4WRE6W32-2X/G24K4/V
R901433171 4WRE6W9-32-2X/G24K4/V
R901022178 4WRE6WA08-2X/G24K4/V
R900965434 4WRE6WA16-2X/G24K4/V
R901300969 4WRE6WA16-2X/G24K4/V-303
R901011624 4WRE6WA32-2X/G24K4/V
R902437398 4WRE6V08-2X/G24Z4/V-822
R902437418 4WRE6V16-2X/G24Z4/V-822
R902461723 4WRE6V16-2X/G24Z4/V-916
R902437419 4WRE6V32-2X/G24Z4/V-822
力士樂REXROTH二位四通和三位四通比例方向閥直控式，閥芯帶位移電反饋，帶集成式放大版（OBE）4WREE
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R901126284 4WREE10E50-2X/G24K31/A1V-280
R901219466 4WREE10E50-2X/G24K31/A1V=XV
R901354780 4WREE10E50-2X/G24K31/F1M
R900943094 4WREE10E50-2X/G24K31/F1V
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R900948360 4WREE10W75-2X/G24K31/F1V
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R900706670 4WREE6E3-32-2X/G24K31/A1V
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R901220128 4WREE6E32-2X/G24K31/A1V-204=XV
R900974914 4WREE6E32-2X/G24K31/A1V-280
R900975521 4WREE6E32-2X/G24K31/A1V=LB
R901354736 4WREE6E32-2X/G24K31/F1M
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R978899985 4WREE6V32-2X/G24K31/A1VSO43A-1485
R978912989 4WREE6V32-2X/G24K31/F1VSO43A-1639
力士樂REXROTH二位四通和三位四通比例方向閥直控式，閥芯帶位移電反饋，帶集成式放大版（OBE）4WREE
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R900703908 4WREE10E1-50-24/G24K31/F1V
R901381875 4WREE10E1-75-24/G24K31/A1M
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R901268118 4WREE10E1-75-24/G24K31/A1V-280
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R900927231 4WREE10E50-24/G24K31/A1V
R901126284 4WREE10E50-24/G24K31/A1V-280
R901219466 4WREE10E50-24/G24K31/A1V=XV
R901354780 4WREE10E50-24/G24K31/F1M
R900943094 4WREE10E50-24/G24K31/F1V
R987098779 4WREE10E50-24/G24K31/F1V=CSA
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R900927356 4WREE10E75-24/G24K31/F1V
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液壓執行元件
將液壓能轉換為機械能的裝置，其作用是在壓力油的推動下輸出力和速度或轉矩和速度，以驅動工作裝置做工。例如液壓缸、液壓馬達。
2.1液壓馬達
液壓馬達習慣上是指輸出旋轉運動的，將液壓泵提供的液壓能轉變為機械能的能量轉換裝置。
液壓馬達亦稱為油馬達，主要應用于注塑機械、船舶、起揚機、工程機械、建筑機械、煤礦機械、礦山機械、冶金機械、船舶機械、石油化工、港口機械等。
高速馬達齒輪馬達具有體積小、重量輕、結構簡單、工藝性好、對油液的污染不敏感、耐沖擊和慣性小等優點。缺點有扭矩脈動較大、效率較低、起動扭矩較小(僅為額定扭矩的60%-一70%)和低速穩定性差等。
2.2液壓缸
液壓缸是將液壓能轉變為機械能的、做直線往復運動(或擺動運動)的液壓執行元件。它結構簡單、工作可靠。用它來實現往復運動時，可免去減速裝置，并且沒有傳動間隙，運動平穩，因此在各種機械的液壓系統中得到廣泛應用。液壓缸輸出力和活塞有效面積及其兩邊的壓差成正比;液壓缸基本上由缸筒和缸蓋、活塞和活塞桿、密封裝置、緩神裝置與排氣裝置組成。緩神裝置與排氣裝置視具體應用場合而定，其他裝置則必不可少。
3.3液壓控制調節元件
用來控制液壓傳動系統中油液的流動方向、壓力和流量，以保證液壓執行元件和工作裝置完成指定工作。
液壓傳動中用來控制液體壓力、流量和方向的元件。其中控制壓力的稱為壓力控制閥，控制流量的稱為流量控制閥，控制通、斷和流向的稱為方向控制閥。
3.4液壓輔助元件
保證液壓傳動系統正常工作。例如油箱、油管、濾油器。
液壓輔件是系統的一一個重要組成部分，其合理設計和選用在很大程度上影響液壓系統的效率、噪聲、溫升、工作可靠性等技術性能。主要包括:
3.4.1過濾器
過濾器的作用:濾去油中雜質，維護油液清潔，防止油液污染，保證系統正常工作。
3.4.2蓄能器
蓄能器的作用:
蓄能器是液壓系統中儲存和釋放壓力能的裝置。
1.作輔助動力源或緊急動力源在工作循環不同階段需要的流量變化很大時，常采用蓄能器和一個流量較小的泵組成油源。另外當驅動泵的原動機發生故障時，蓄能器可作緊急動力源。
2.保壓和補充泄漏需要較長時間保壓而泵卸載時，可利用蓄能器釋放儲存的壓力油，補充系統泄漏，保持系統壓力。
3.吸收沖擊和消除壓力脈動在壓力沖擊處和泵的出口安裝蓄能器可吸收壓力沖擊峰值和壓力脈動，提高系統工作的平穩性。
3.4.3油箱
油箱是液壓系統中儲存液壓油用。
油箱的功用:
儲存系統所需的足夠油液;;
散發油液中的熱量;
逸出溶解在油液中的空氣; :
沉淀油液中的污物;
對中小型液壓系統，泵裝置及一些液壓元件還安裝在油箱頂板上。
3.4.4熱交換器
系統能量損失轉換為熱量以后，會使油液溫度升高。若長時間油溫過高,油液粘度下降，泄漏增加，密封老化，油液氧化，嚴重影響系統正常工作。為保證正常工作溫度在20~65C，需要在系統中安裝冷卻器。相反，油溫過低，油液粘度過大，設備啟動困難，壓力損失加大并引起過大的振動。此種情況下系統應安裝加熱器，將油液溫度升高到適合的溫度。
3.4.5管件
管件是用來連接液壓元件、輸送液壓油液的連接件。它應保證有足夠的強度,沒有泄漏,密封性能好，壓力損失小，拆裝方便。
3.4.6密封裝置
密封裝置用來防止系統油液的內外泄漏，以及外界灰塵和異物的侵入，保證系統建立必要壓力。
3.5液壓工作介質
工作介質指傳動液體，通常被稱為液壓油。
3.5.1液壓油
液壓油引就是利用液體壓力能的液壓系統使用的液壓介質，在液壓系統中起著能量傳遞、系統潤滑、防腐、防銹、冷卻等作用。對于液壓油來說，首先應滿足液壓裝置在工作溫度下與啟動溫度下對液體粘度的要求，由于油的粘度變化直接與液壓動作、傳遞效率和傳遞精度有關，還要求油的粘溫性能和剪切安定性應滿足不同用途所提出的各種需求。
3.5.2液壓油的要求
質量要求:
1.合適的粘 度和良好的粘溫性能，以保證液壓元件在工作壓力和工作溫度發生變化的條件下得到良好潤滑、冷卻和密封。
2.良好的極壓抗磨性， 以保證油泵、液壓馬達、控制閥和油缸中的摩擦副在高壓、高速苛刻條件下得到正常的潤滑，減少磨損。
3.優良的抗氧化安定性、水解安定性和熱穩定性，以抵抗空氣、水分和高溫、高壓等因素的影響或作用，使其不易老化變質，延長使用壽命。
4.良好的抗泡性 和空氣釋放值，以保證在運轉中受到機械劇烈攪拌的條件下產生的泡沫能迅速消失:并能將混入油中的空氣在較短時間內釋放出來，以實現準確、靈敏、平穩地傳遞靜壓。
5.良好的抗乳化性， 能與混入油中的水分迅速分離，以免形成乳化液，引起液壓系統的金屬材質銹蝕和降低使用性能。
6.良好的防銹性，以防止金屬表面銹蝕。