液(ye)壓(ya)(ya)(ya)缸(gang)工作(zuo)過程：降低風機(ji)流量及全壓(ya)(ya)(ya)時(shi)(shi)(shi),電動(dong)(dong)(dong)(dong)(dong)頭驅動(dong)(dong)(dong)(dong)(dong)控(kong)制盤(pan)(7)逆時(shi)(shi)(shi)針旋轉,帶動(dong)(dong)(dong)(dong)(dong)滑塊(12)向右(you)移動(dong)(dong)(dong)(dong)(dong)。此(ci)時(shi)(shi)(shi)液(ye)壓(ya)(ya)(ya)缸(gang)只隨葉(xie)輪(lun)作(zuo)旋轉運動(dong)(dong)(dong)(dong)(dong),定(ding)位軸(1)及與之相(xiang)連(lian)的雙面齒條(8)靜止不(bu)(bu)(bu)動(dong)(dong)(dong)(dong)(dong)。于(yu)是大(da)齒輪(lun)(10)只能推動(dong)(dong)(dong)(dong)(dong)與之嚙合的單(dan)面小齒條(13)往右(you)移動(dong)(dong)(dong)(dong)(dong)。壓(ya)(ya)(ya)力(li)油(you)(you)(you)(you)口與藍(lan)色(se)油(you)(you)(you)(you)道(dao)相(xiang)通(tong),紅色(se)油(you)(you)(you)(you)道(dao)與回(hui)(hui)油(you)(you)(you)(you)口接(jie)通(tong),壓(ya)(ya)(ya)力(li)油(you)(you)(you)(you)從(cong)藍(lan)色(se)油(you)(you)(you)(you)道(dao)不(bu)(bu)(bu)斷進入活塞(sai)(sai)(3)右(you)側(ce)的液(ye)壓(ya)(ya)(ya)油(you)(you)(you)(you)缸(gang)內,使液(ye)壓(ya)(ya)(ya)油(you)(you)(you)(you)缸(gang)不(bu)(bu)(bu)斷向右(you)移動(dong)(dong)(dong)(dong)(dong)。活塞(sai)(sai)左側(ce)液(ye)壓(ya)(ya)(ya)油(you)(you)(you)(you)缸(gang)內的工作(zuo)油(you)(you)(you)(you)從(cong)紅色(se)油(you)(you)(you)(you)道(dao)通(tong)過回(hui)(hui)油(you)(you)(you)(you)孔返(fan)回(hui)(hui)油(you)(you)(you)(you)箱(xiang)。液(ye)壓(ya)(ya)(ya)油(you)(you)(you)(you)缸(gang)與葉(xie)輪(lun)上的每個(ge)動(dong)(dong)(dong)(dong)(dong)葉(xie)片的調(diao)節(jie)桿(調(diao)節(jie)桿連(lian)接(jie)葉(xie)柄，葉(xie)柄上有葉(xie)片)相(xiang)連(lian),當液(ye)壓(ya)(ya)(ya)油(you)(you)(you)(you)缸(gang)向右(you)移動(dong)(dong)(dong)(dong)(dong)時(shi)(shi)(shi),動(dong)(dong)(dong)(dong)(dong)葉(xie)片的角度減小,風機(ji)輸送流量與全壓(ya)(ya)(ya)隨即降低。

　　液(ye)壓(ya)(ya)缸(gang)反(fan)饋(kui)過程：當液(ye)壓(ya)(ya)缸(gang)向(xiang)(xiang)右移動(dong)(dong)時(shi),定位軸(1)被(bei)帶動(dong)(dong)同時(shi)向(xiang)(xiang)右移動(dong)(dong)。但由(you)于滑(hua)塊不(bu)動(dong)(dong),所(suo)以雙面(mian)齒(chi)條(tiao)(8)向(xiang)(xiang)右移動(dong)(dong)帶動(dong)(dong)大小齒(chi)輪(lun)(10、11)使單面(mian)齒(chi)條(tiao)(13)向(xiang)(xiang)左移動(dong)(dong)。這(zhe)(zhe)樣又使伺服閥將油(you)道藍(lan)色與(yu)紅色油(you)道的油(you)孔(kong)關(guan)閉,液(ye)壓(ya)(ya)油(you)缸(gang)隨之處在(zai)新(xin)的平衡位置不(bu)再移動(dong)(dong)。而(er)動(dong)(dong)葉(xie)片(pian)(pian)亦在(zai)關(guan)小的狀態(tai)下工作(zuo),這(zhe)(zhe)就是反(fan)饋(kui)過程。在(zai)反(fan)饋(kui)時(shi)指示(shi)齒(chi)輪(lun)帶動(dong)(dong)指示(shi)軸(指示(shi)盤)旋轉,將動(dong)(dong)葉(xie)片(pian)(pian)關(guan)小的角度顯示(shi)出來。