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其工作特點是只(zhi)有(you)P和P同(tong)時(shi)供氣,口才(cai)有輸(shu)出(chu);當P或P單獨通氣(qi)時,閥(fa)(fa)芯就被推至相對端,封閉截止型(xing)閥(fa)(fa)口;當P和P同(tong)時通氣時,哪端壓力低(di),口就和哪端相(xiang)通,另一(yi)端關(guan)閉(bi),其邏輯關(guan)系為“與(yu)”,圖(tu)形符(fu)號如圖(tu)。
換向(xiang)型方向(xiang)控制(zhi)閥
換向(xiang)(xiang)型方向(xiang)(xiang)控(kong)(kong)制(zhi)(zhi)閥簡稱(cheng)換向(xiang)(xiang)閥,是(shi)通過改變(bian)(bian)氣流通道而使氣體流動方向(xiang)(xiang)發生變(bian)(bian)化,從而達(da)到(dao)改變(bian)(bian)氣動執行元件運動方向(xiang)(xiang)的目的。它包括氣壓控(kong)(kong)制(zhi)(zhi)換向(xiang)(xiang)閥、電磁控(kong)(kong)制(zhi)(zhi)換向(xiang)(xiang)閥、機械控(kong)(kong)制(zhi)(zhi)換向(xiang)(xiang)閥、人力控(kong)(kong)制(zhi)(zhi)換向(xiang)(xiang)閥和時(shi)間控(kong)(kong)制(zhi)(zhi)換向(xiang)(xiang)閥等(deng)。
氣(qi)壓控制(zhi)換向閥(fa)
氣壓控(kong)(kong)(kong)(kong)制換向(xiang)閥是利用氣體壓力使(shi)主(zhu)閥芯和(he)閥體發(fa)生相(xiang)對(dui)運(yun)動而改變氣體流向(xiang)的(de)元件。調(diao)節(jie)器(qi)(qi)(qi)有正(zheng)作(zuo)用和(he)反(fan)作(zuo)用調(diao)節(jie)器(qi)(qi)(qi)兩(liang)種(zhong)。調(diao)節(jie)器(qi)(qi)(qi)正(zheng)反(fan)作(zuo)用的(de)選(xuan)擇同被(bei)(bei)控(kong)(kong)(kong)(kong)過(guo)(guo)程(cheng)(cheng)的(de)特(te)性及調(diao)節(jie)閥的(de)氣開(kai)、氣關形式有關。被(bei)(bei)控(kong)(kong)(kong)(kong)過(guo)(guo)程(cheng)(cheng)也分正(zheng)反(fan)兩(liang)種(zhong)。當(dang)被(bei)(bei)控(kong)(kong)(kong)(kong)過(guo)(guo)程(cheng)(cheng)的(de)輸(shu)入(ru)量(liang)(liang)通過(guo)(guo)調(diao)節(jie)閥的(de)物料(liao)或能量(liang)(liang)增(zeng)加(jia)或減小時,其(qi)輸(shu)出(chu)被(bei)(bei)控(kong)(kong)(kong)(kong)參數亦(yi)增(zeng)加(jia)或減小,此(ci)時稱(cheng)其(qi)被(bei)(bei)控(kong)(kong)(kong)(kong)過(guo)(guo)程(cheng)(cheng)為正(zheng)作(zuo)用;反(fan)之,當(dang)被(bei)(bei)控(kong)(kong)(kong)(kong)過(guo)(guo)程(cheng)(cheng)的(de)輸(shu)入(ru)量(liang)(liang)增(zeng)加(jia)時,其(qi)輸(shu)出(chu)卻減小,稱(cheng)其(qi)過(guo)(guo)程(cheng)(cheng)為反(fan)作(zuo)用。一個(ge)控(kong)(kong)(kong)(kong)制系統能夠正(zheng)常工作(zuo),則其(qi)組成的(de)各(ge)個(ge)環節(jie)的(de)極性可(ke)用其(qi)靜(jing)態(tai)放大(da)系數表示相(xiang)乘必(bi)須(xu)為正(zheng)。
如圖.為快速排氣閥的結構(gou)原理(li)。當氣體從(cong)P通(tong)入時,氣體的壓力使(shi)唇(chun)型密封(feng)圈右移(yi)封(feng)閉(bi)快速排氣口e,并壓縮(suo)密封圈的唇邊,導通(tong)P口和(he)口,當P口沒有壓縮空(kong)氣時,密(mi)封圈的唇邊張開,封閉和P通道,口氣體的壓(ya)力使唇型(xing)密(mi)封圈左移,、T通(tong)過(guo)排氣通(tong)道(dao)e連通而快速排氣(qi)(qi)一般排到(dao)大氣(qi)(qi)中。