單向閥(fa)(fa)(fa)(fa)，俗稱單向閥(fa)(fa)(fa)(fa)，只能(neng)沿水口(kou)(kou)，入口(kou)(kou)流(liu)(liu)(liu)動(dong)，水口(kou)(kou)出(chu)(chu)口(kou)(kou)不能(neng)回流(liu)(liu)(liu)。也稱為止(zhi)(zhi)回閥(fa)(fa)(fa)(fa)或(huo)逆止(zhi)(zhi)閥(fa)(fa)(fa)(fa)。用于液壓(ya)系(xi)統中防(fang)止(zhi)(zhi)油倒流(liu)(liu)(liu)或(huo)氣動(dong)系(xi)統中防(fang)止(zhi)(zhi)壓(ya)縮空(kong)氣倒流(liu)(liu)(liu)。止(zhi)(zhi)回閥(fa)(fa)(fa)(fa)有直(zhi)(zhi)通(tong)(tong)式和直(zhi)(zhi)角式兩種(zhong)。直(zhi)(zhi)通(tong)(tong)止(zhi)(zhi)回閥(fa)(fa)(fa)(fa)通(tong)(tong)過(guo)螺(luo)紋(wen)連(lian)(lian)接(jie)安(an)裝在管(guan)道上。直(zhi)(zhi)角止(zhi)(zhi)回閥(fa)(fa)(fa)(fa)有三種(zhong)形(xing)式：螺(luo)紋(wen)連(lian)(lian)接(jie)、板式連(lian)(lian)接(jie)和法蘭連(lian)(lian)接(jie)。普通(tong)(tong)單向閥(fa)(fa)(fa)(fa)的作用是使油只向一個(ge)方向流(liu)(liu)(liu)動(dong)，不允(yun)許反向流(liu)(liu)(liu)動(dong)。其用途(tu)是：安(an)裝在泵(beng)的出(chu)(chu)口(kou)(kou)處，可(ke)以防(fang)止(zhi)(zhi)系(xi)統壓(ya)力(li)沖擊對(dui)泵(beng)的沖擊。另外，在泵(beng)不工作時，可(ke)以防(fang)止(zhi)(zhi)系(xi)統油通(tong)(tong)過(guo)泵(beng)回流(liu)(liu)(liu)到油箱，單向閥(fa)(fa)(fa)(fa)還可(ke)以用來分隔油路(lu)，防(fang)止(zhi)(zhi)干擾。單向閥(fa)(fa)(fa)(fa)可(ke)以與其他閥(fa)(fa)(fa)(fa)組合(he)形(xing)成復合(he)閥(fa)(fa)(fa)(fa)。

止(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)有直(zhi)通(tong)式和直(zhi)角式兩(liang)(liang)種(zhong)。直(zhi)通(tong)止(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)通(tong)過螺(luo)紋連接安裝(zhuang)在(zai)管道上。直(zhi)角止(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)有三種(zhong)形式：螺(luo)紋連接、板式連接和法蘭(lan)連接。液(ye)壓(ya)(ya)單向(xiang)(xiang)閥(fa)(fa)(fa)又稱(cheng)鎖止(zhi)(zhi)(zhi)(zhi)閥(fa)(fa)(fa)或保壓(ya)(ya)閥(fa)(fa)(fa)，與單向(xiang)(xiang)閥(fa)(fa)(fa)相(xiang)同，是為了(le)防止(zhi)(zhi)(zhi)(zhi)油的(de)倒流(liu)。但是，當(dang)油流(liu)在(zai)液(ye)壓(ya)(ya)回(hui)路中需(xu)要反向(xiang)(xiang)流(liu)動時，可以(yi)用控制(zhi)油壓(ya)(ya)打(da)開單向(xiang)(xiang)閥(fa)(fa)(fa)，使油流(liu)可以(yi)雙(shuang)向(xiang)(xiang)流(liu)動。液(ye)壓(ya)(ya)止(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)采用錐形閥(fa)(fa)(fa)芯(xin)，密封(feng)性能好。當(dang)需(xu)要關閉油路時，該閥(fa)(fa)(fa)可用作油路的(de)單向(xiang)(xiang)鎖，以(yi)保持壓(ya)(ya)力。液(ye)壓(ya)(ya)止(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)(fa)(fa)控制(zhi)漏油有兩(liang)(liang)種(zhong)方式：內漏和外漏。內泄式可用于油流(liu)反向(xiang)(xiang)出口無背壓(ya)(ya)的(de)油路中；否則，需(xu)要泄漏型(xing)來降低控制(zhi)油的(de)壓(ya)(ya)力。

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