液(ye)(ye)壓(ya)缸(gang)(gang)工(gong)作(zuo)過(guo)程：降低風(feng)機流量及(ji)全(quan)壓(ya)時(shi),電(dian)動(dong)(dong)頭驅動(dong)(dong)控制盤(7)逆(ni)時(shi)針(zhen)旋轉(zhuan),帶動(dong)(dong)滑塊(12)向右(you)移動(dong)(dong)。此時(shi)液(ye)(ye)壓(ya)缸(gang)(gang)只隨葉(xie)(xie)(xie)輪作(zuo)旋轉(zhuan)運動(dong)(dong),定位軸(1)及(ji)與(yu)之相(xiang)(xiang)連(lian)的(de)雙面齒條(tiao)(tiao)(8)靜止不動(dong)(dong)。于(yu)是(shi)大齒輪(10)只能推(tui)動(dong)(dong)與(yu)之嚙合(he)的(de)單面小(xiao)齒條(tiao)(tiao)(13)往右(you)移動(dong)(dong)。壓(ya)力(li)油(you)(you)(you)口與(yu)藍色油(you)(you)(you)道(dao)相(xiang)(xiang)通,紅(hong)色油(you)(you)(you)道(dao)與(yu)回油(you)(you)(you)口接通,壓(ya)力(li)油(you)(you)(you)從藍色油(you)(you)(you)道(dao)不斷(duan)(duan)進入(ru)活(huo)塞(3)右(you)側的(de)液(ye)(ye)壓(ya)油(you)(you)(you)缸(gang)(gang)內(nei),使(shi)液(ye)(ye)壓(ya)油(you)(you)(you)缸(gang)(gang)不斷(duan)(duan)向右(you)移動(dong)(dong)。活(huo)塞左側液(ye)(ye)壓(ya)油(you)(you)(you)缸(gang)(gang)內(nei)的(de)工(gong)作(zuo)油(you)(you)(you)從紅(hong)色油(you)(you)(you)道(dao)通過(guo)回油(you)(you)(you)孔返回油(you)(you)(you)箱。液(ye)(ye)壓(ya)油(you)(you)(you)缸(gang)(gang)與(yu)葉(xie)(xie)(xie)輪上的(de)每個動(dong)(dong)葉(xie)(xie)(xie)片(pian)的(de)調(diao)(diao)節(jie)桿(調(diao)(diao)節(jie)桿連(lian)接葉(xie)(xie)(xie)柄，葉(xie)(xie)(xie)柄上有葉(xie)(xie)(xie)片(pian))相(xiang)(xiang)連(lian),當液(ye)(ye)壓(ya)油(you)(you)(you)缸(gang)(gang)向右(you)移動(dong)(dong)時(shi),動(dong)(dong)葉(xie)(xie)(xie)片(pian)的(de)角度減(jian)小(xiao),風(feng)機輸送流量與(yu)全(quan)壓(ya)隨即降低。

　　液(ye)壓缸反(fan)饋(kui)過程：當液(ye)壓缸向右(you)移(yi)(yi)動(dong)時(shi),定位(wei)軸(zhou)(1)被(bei)帶動(dong)同時(shi)向右(you)移(yi)(yi)動(dong)。但由于滑塊不(bu)動(dong),所以雙面齒條(8)向右(you)移(yi)(yi)動(dong)帶動(dong)大小齒輪(lun)(10、11)使(shi)單(dan)面齒條(13)向左移(yi)(yi)動(dong)。這(zhe)樣又使(shi)伺(si)服閥將(jiang)油道藍色與紅色油道的(de)油孔關(guan)閉,液(ye)壓油缸隨之處在新的(de)平(ping)衡位(wei)置(zhi)不(bu)再移(yi)(yi)動(dong)。而動(dong)葉片亦在關(guan)小的(de)狀態(tai)下工作(zuo),這(zhe)就是反(fan)饋(kui)過程。在反(fan)饋(kui)時(shi)指示齒輪(lun)帶動(dong)指示軸(zhou)(指示盤)旋轉,將(jiang)動(dong)葉片關(guan)小的(de)角(jiao)度顯示出來。