R900780198 DBW20B1-5X/350-6EG24N9K4力士樂比例溢流閥

R900780198 DBW20B1-5X/350-6EG24N9K4力士樂比例溢流閥

武漢百士自動化設備有限公司專注于液壓、氣動、工控自動化備件銷售，熱誠歡迎新老客戶咨詢購買！

我司主要經銷氣動，液壓，工控自動化流體控制設備備品備件
主營品牌：博世力士樂BOSCH-REXROTH、安沃馳AVENTICS、迪普馬DUPLOMATIC、愛爾泰克AIRTEC、本特利Bently、貝加萊B&R、世格ASCO、阿托斯ATOS。
主要涵蓋產品：電磁閥、比例閥、單向閥、溢流閥、壓力繼電器、壓力傳感器、葉片泵、柱塞泵、齒輪泵、蓄能器、氣動閥、氣缸、氣源處理單元、探頭、前置器、延伸電纜、監測模塊、校驗儀、伺服驅動器、PLC模塊、I/O模塊、伺服電機、觸摸屏等。
伺服閥與比例閥之間的差別并沒有嚴格的規定，因為比例閥的性能越來越好，逐漸向伺服閥靠近，所以近些年出現了比例伺服閥。
比例閥和伺服閥的區別主要體現在以下幾點：
1.驅動裝置不同。比例閥的驅動裝置是比例電磁鐵；伺服閥的驅動裝置是力馬達或力矩馬達；
2.性能參數不同。滯環、中位死區、頻寬、過濾精度等特性不同，因此應用場合不同，伺服閥和伺服比例閥主要應用在閉環控制系統，其它結構的比例閥主要應用在開環控系統及閉環速度控制系統；
2.1 伺服閥中位沒有死區，比例閥有中位死區；
2.2 伺服閥的頻響（響應頻率）更高，可以高達200Hz左右，比例閥一般高幾十Hz；
2.3 伺服閥對液壓油液的要求更高，需要精過濾才行，否則容易堵塞，比例閥要求低一些；
3.閥芯結構及加工精度不同。比例閥采用閥芯+閥體結構，閥體兼作閥套。伺服閥和伺服比例閥采用閥芯+閥套的結構。
4.中位機能種類不同。比例換向閥具有與普通換向閥相似的中位機能，而伺服閥中位機能只有O型（Rexroth產品的E型）。
5.閥的額定壓降不同。
而比例伺服閥性能介于伺服閥和比例閥之間。
比例換向閥屬于比例閥的一種，用來控制流量和流向。
3延伸資料
---電氣比例閥
自動控制可分成斷續控制和連續控制。斷續控制即開關控制。氣動控制系統中使用動作頻率較低的開關式(ON-OFF)的換向閥來控制氣路的通斷?？繙p壓閥來調節所需要的壓力，靠節流閥來調節所需要的流量。這種傳統的氣動控制系統要想要有多個輸出力和多個運動速度，就需要多個減壓閥、節流閥及換向閥。這樣，不僅元件需要多，成本高，構成系統復雜，且許多元件都需要預先進行人工調節。電氣比例閥控制屬于連續控制，其特點是輸出量隨輸入量的變化而變化，輸出量與輸入量之間存在一定的比例關系。比例控制有開環控制和閉環控制之分。

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