云(yun)南电动(dong)压差(cha)旁通(tong)阀(fa)由差压控(kong)制器、电动(dong)调(diao)节(jie)阀组(zu)成(cheng)，工(gong)作(zuo)原理(li)是(shi)由差(cha)压(ya)控制器(qi)监(jian)测系统(tong)的(de)压(ya)差(cha)，当(dang)系(xi)统供、回水(shui)压差增(zeng)大(da)并(bing)超(chao)过(guo)控制器设定(ding)值时，控制器将控(kong)制电(dian)动(dong)阀(fa)门(men)开(kai)大，管网部(bu)分循环(huan)水(shui)经旁(pang)通阀(fa)流过，从而使系(xi)统供、回水压(ya)差减(jian)小(xiao)。反(fan)之，系(xi)统(tong)的压(ya)差(cha)如果(guo)小(xiao)于(yu)设定值，则(ze)控制器将电(dian)动(dong)阀门(men)关(guan)小(xiao)，使系(xi)统(tong)压差(cha)增加(jia)。

  云(yun)南自力(li)式(shi)压(ya)差旁通(tong)阀(fa)门(men)内(nei)部(bu)装有感压膜(mo)片(pian)，通(tong)过导(dao)压(ya)孔感(gan)知(zhi)分集系统(tong)两端的压差，当压(ya)差超过(guo)设(she)定值(zhi)时，感压膜片会通(tong)过阀杆带动(dong)阀(fa)塞(sai)打开，部(bu)分流量从(cong)此经(jing)过(guo)，以(yi)保证(zheng)机组(zu)流(liu)量(liang)不(bu)小(xiao)于安全流量(liang)值。当压(ya)差减(jian)小，阀(fa)门(men)自(zi)动关(guan)小、关(guan)闭，压(ya)差恢(hui)复到(dao)设定(ding)值。