?優(yōu)勢減壓閥ZDR10DA1-5X/210YV

武穴黎翔機電設備有限公司，詢價聯(lián)系人：何女士

詢價電話：0713-6542758，手機：18934630908????

詢價傳真：0713-6542758

詢價QQ:?736567721,704552157

現(xiàn)貨特價型號：R900925687?4WRAE10W1-30-22/G24N9K31/F1V??2臺

D634-371C?R24K02MONSS2????3臺DG4V-3-6C-M-U-H7-60????10臺

DG4V-3-2N-M-U-H7-60????15臺DG4V-3-2A-M-U-H7-60????10臺

　　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)需要打開任意一個開度，由此控制通過流量的大小，這類閥有手動控制的，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：以電控方式實現(xiàn)對流量的節(jié)流控制（當然經(jīng)過結(jié)構(gòu)上的改動也可實現(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，因為它需要一定的流量來維持前置級控制油路的工作。

　　伺服閥的主閥一般來說和換向閥一樣是滑閥結(jié)構(gòu)，只不過閥芯的換向不是靠電磁鐵來推動，而是靠前置級閥輸出的液壓力來推動，這一點和電液換向閥比較相似，只不過電液換向閥的前置級閥是電磁換向閥，而伺服閥的前置級閥是動態(tài)特性比較好的噴嘴擋板閥或射流管閥。?

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　　也就是說，伺服閥的主閥是靠前置級閥的輸出壓力來控制的，而前置級閥的壓力則來自于伺服閥的入口p，假如p口的壓力不足，前置級閥就不能輸出足夠的壓力來推動主閥芯動作。?

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　　而我們知道，當負載為零的時候，如果四通滑閥完全打開，p口壓力＝t口壓力＋閥口壓力損失（忽略油路上的其它壓力損失），如果閥口壓力損失很小，t口壓力又為零，那么p口的壓力就不足以供給前置級閥來推動主閥芯，整個伺服閥就失效了。所以伺服閥的閥口做得偏小，即使在閥口全開的

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