?電液比例控制閥?作用：連續(xù)或按比例地隨輸入電氣信號(hào)的變化而調(diào)節(jié)和控制液流壓力、方向和流量 分類 結(jié)構(gòu)簡(jiǎn)單化，電液伺服閥準(zhǔn)確度降低，電磁比+普通的液壓閥外觀與一般的電磁鐵相同，但吸力大∝I 按控制參數(shù)：比例壓力閥、比例流量閥、比例方向閥 特點(diǎn)：既具有結(jié)構(gòu)簡(jiǎn)單，通用性強(qiáng)的特點(diǎn)，又具有伺服閥能遠(yuǎn)程、連續(xù)操縱優(yōu)點(diǎn)，故而又稱“廉價(jià)伺服閥” 比例溢流閥：比例電磁鐵+直動(dòng)溢流閥主體 比例溢流閥工作原理：輸入一I，產(chǎn)生一電磁力，作用于閥芯上，得到一控制壓力，其p∝I，I變化，p也變化。
比例溢流閥特點(diǎn) 1比例電磁鐵與其他壓力閥組合，可簡(jiǎn)單組成比例溢流閥、比例順序閥、比例減壓閥 2用一個(gè)比例閥可實(shí)現(xiàn)多級(jí)壓力控制，簡(jiǎn)單化油路，如：三級(jí)調(diào)壓回路舉例 比例換向閥組成：比例電磁鐵替代普通的電磁換向閥中的普通電磁鐵即可。
工作原理：輸入一I，得到一個(gè)運(yùn)動(dòng)方向，并且還可改變輸出流量的大小；改變電流信號(hào)極性，即可改變運(yùn)動(dòng)方向 特點(diǎn) 1∵換向閥芯上有一個(gè)三角槽 ∴閥芯運(yùn)動(dòng)時(shí)，其通流面積變化 故?液流方向變化時(shí)，流量也會(huì)變化 2在大流量情況下，應(yīng)采用先導(dǎo)式比例方向閥。
也可做成比例多路閥 比例調(diào)速閥組成:比例電磁鐵可以代替調(diào)速閥中的調(diào)節(jié)螺帽 比例調(diào)速閥工作原理：輸入一個(gè)I，節(jié)流閥閥口、流量、q∝I 比例調(diào)速閥特點(diǎn) 1∵有定差減壓閥保證△p節(jié)=c，∴q不隨F變化而變化，qV=c。
2用一個(gè)閥只須改變I，便可得到多級(jí)速度，油路簡(jiǎn)單如：轉(zhuǎn)塔進(jìn)給系統(tǒng) 電液數(shù)字閥的開發(fā)：20世紀(jì)80年代初開發(fā)的可用計(jì)算機(jī)實(shí)現(xiàn)電液系統(tǒng)控制的新 方法：增量式數(shù)字閥 電液數(shù)字閥分類:數(shù)字流量閥、數(shù)字壓力閥、數(shù)字方向流量閥 舉例：增量式數(shù)字流量閥 增量式數(shù)字流量閥組成：步進(jìn)電動(dòng)機(jī)、滾珠絲杠、閥芯、閥套、閥桿、傳感器等 工作原理：計(jì)算機(jī)發(fā)出信號(hào)后，步進(jìn)電機(jī)轉(zhuǎn)動(dòng)，通過滾絲杠轉(zhuǎn)化為軸向位移，帶動(dòng)節(jié)流閥閥心移動(dòng)，首先打開非全周節(jié)流口，流量較小，而后打開全周節(jié)流口，流量較大，可達(dá)3600l/min。
特點(diǎn) 1閥芯、閥套、閥桿的相對(duì)熱膨脹?取得溫度補(bǔ)償，維持流量恒定 2該閥無反饋功能，但裝有零位移傳感器，每個(gè)控制終了，閥芯都可在它控制下回到零位，重復(fù)精度較高 90-L-075-KP-1-BC-80-S-3-S1-D-00-GBA-42-42-24 90L075KP1BC80S3S1D00GBA424224 90-L-075-KP-1-BC-80-S-3-S1-D-03-GBA-35-35-24 90L075KP1BC80S3S1D03GBA353524 90-L-075-KP-1-BC-80-S-3-S1-D-03-GBA-42-42-24 90L075KP1BC80S3S1D03GBA424224 90-L-075-KP-1-BC-80-S-4-S1-D-03-GBA-42-42-24 90L075KP1BC80S4S1D03GBA424224 90-L-075-KP-1-BC-80-S-4-S1-D-03-GBA-42-42-28 90L075KP1BC80S4S1D03GBA424228 90-L-075-KP-1-CD-60-P-3-C7-D-00-GBA-35-35-20 90L075KP1CD60P3C7D00GBA353520 90-L-075-KP-1-CD-60-P-3-S1-D-03-GBA-35-35-24 90L075KP1CD60P3S1D03GBA353524 90-L-075-KP-1-CD-60-P-4-C7-E-03-GBA-23-23-24 90L075KP1CD60P4C7E03GBA232324 90-L-075-KP-1-CD-60-R-3-S1-D-03-GBA-42-42-24 90L075KP1CD60R3S1D03GBA424224 90-L-075-KP-1-CD-60-R-3-T2-C-03-GBA-42-38-24 90L075KP1CD60R3T2C03GBA423824 90-L-075-KP-1-CD-60-S-3-C6-D-03-GBA-35-35-24 90L075KP1CD60S3C6D03GBA353524 90-L-075-KP-1-CD-60-S-3-S1-D-03-GBA-35-35-24 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