比例閥采用閥芯+閥體結(jié)構(gòu)。伺服閥和伺服比例閥主要應(yīng)用在閉環(huán)控制系統(tǒng)，比例閥的驅(qū)動(dòng)裝置是比例電磁鐵。
伺服閥的驅(qū)動(dòng)裝置是力馬達(dá)或力矩馬達(dá).閥體兼作閥套。
驅(qū)動(dòng)裝置不同.所以近些年出現(xiàn)了比例伺服閥。
比例閥一般最高幾十Hz，伺服閥中位沒(méi)有死區(qū)，伺服閥對(duì)液壓油液的要求更高.性能參數(shù)不同；否則容易堵塞，
用來(lái)控制流量和流向，比例閥要求低一些.比例閥有中位死區(qū)；
比例閥和伺服閥的區(qū)別主要體現(xiàn)在以下幾點(diǎn)：
逐漸向伺服閥靠近，
比例換向閥屬于比例閥的一種，滯環(huán)、中位死區(qū)、頻寬、過(guò)濾精度等特性不同.閥的額定壓降不同；比例換向閥具有與普通換向閥相似的中位機(jī)能，
而比例伺服閥性能介于伺服閥和比例閥之間，因此應(yīng)用場(chǎng)合不同，伺服閥和伺服比例閥采用閥芯+閥套的結(jié)構(gòu)。中位機(jī)能種類(lèi)不同.其它結(jié)構(gòu)的比例閥主要應(yīng)用在開(kāi)環(huán)控系統(tǒng)及閉環(huán)速度控制系統(tǒng)；因?yàn)楸壤y的性能越來(lái)越好；2伺服閥的頻響（響應(yīng)頻率）更高。閥芯結(jié)構(gòu)及加工精度不同.伺服閥與比例閥之間的差別并沒(méi)有嚴(yán)格的規(guī)定。
，可以高達(dá)200Hz左右，需要精過(guò)濾才行，而伺服閥中位機(jī)能只有O型（Rexroth產(chǎn)品的E型）。
型號(hào) 4WRL 和 4WRLE
德國(guó)REXROTH力士樂(lè)高頻響方向閥4WRL
高頻響方向閥，先導(dǎo)式，帶電位反饋4WRPH6C3B24L-2X/G24Z4/M 0811404035
規(guī)格10至35
安裝面按DIN 24340 A型和ISO 4401
控制流量的方向和大小
用于動(dòng)力、位置、速度和位置的閉環(huán)控制
RV-PL先導(dǎo)控制閥
閉環(huán)位置控制先導(dǎo)控制閥和主級(jí)
帶不同閥標(biāo)記的模塊系統(tǒng)
集成電控器（OBE），用于4WRLE
標(biāo)準(zhǔn)和非線性特性曲線
德國(guó)REXROTH力士樂(lè)4WRL系列高頻響方向閥
R901131953 4WRLE25Q3-370M-3X/G24K0/A1M
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