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    電站鍋爐主蒸汽系統包括從鍋爐過熱器出口聯箱至汽輪機進口主汽閥的主蒸汽管道合金管件、合金三通、合金彎頭、閥(fa)門(men)、疏水裝置及(ji)通往用新汽設備的(de)蒸汽支(zhi)管(guan)所組(zu)成的(de)系(xi)統。對于裝有中間再(zai)熱(re)(re)式機組(zu)的(de)發(fa)(fa)電廠，還(huan)包括從(cong)汽輪(lun)機高(gao)壓(ya)缸(gang)排汽至鍋爐再(zai)熱(re)(re)器進口聯箱的(de)再(zai)熱(re)(re)冷段管(guan)道、閥(fa)門(men)及(ji)從(cong)再(zai)熱(re)(re)器出口聯箱至汽輪(lun)機中壓(ya)缸(gang)進口閥(fa)門(men)的(de)再(zai)熱(re)(re)熱(re)(re)段管(guan)道、閥(fa)門(men)。蒸汽系(xi)統輸送工質流(liu)量大，參數高(gao)，用的(de)金屬(shu)材料質量高(gao)，對發(fa)(fa)電廠運行的(de)安全 性、可靠(kao)性、經濟性影(ying)響(xiang)大。

   S109FA機(ji)(ji)(ji)組聯合循環蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)(xi)(xi)統采用(yong)三壓(ya)、再(zai)熱(re)系(xi)(xi)(xi)統。余熱(re)鍋爐中產生的(de)(de)(de)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)有三種壓(ya)力(li)，即高壓(ya)(HP)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)、再(zai)熱(re)(RH)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)和低壓(ya)(LP)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)，它(ta)們相應地進入汽(qi)(qi)(qi)輪(lun)(lun)機(ji)(ji)(ji)(ST)的(de)(de)(de)高、中、低壓(ya)缸(gang)做功。主(zhu)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)(xi)(xi)統的(de)(de)(de)范圍，從余熱(re)鍋爐蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)出口(kou)開始至(zhi)汽(qi)(qi)(qi)輪(lun)(lun)機(ji)(ji)(ji)高、中、低壓(ya)進汽(qi)(qi)(qi)點，并從汽(qi)(qi)(qi)輪(lun)(lun)機(ji)(ji)(ji)(高壓(ya)缸(gang)排(pai)汽(qi)(qi)(qi))開始至(zhi)余熱(re)鍋爐再(zai)熱(re)器(qi)止。本節主(zhu)要介紹高壓(ya)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)(xi)(xi)統、再(zai)熱(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)(xi)(xi)統與低壓(ya)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)(xi)(xi)統。主(zhu)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)(xi)(xi)統的(de)(de)(de)作(zuo)用(yong)是將余熱(re)鍋爐產生的(de)(de)(de)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)送人汽(qi)(qi)(qi)輪(lun)(lun)機(ji)(ji)(ji)做功，同時保(bao)證機(ji)(ji)(ji)組的(de)(de)(de)安全啟停。

(1)高(gao)(gao)(gao)壓(ya)蒸(zheng)汽(qi)管道高(gao)(gao)(gao)壓(ya)蒸(zheng)汽(qi)系(xi)統將來(lai)自余熱鍋爐高(gao)(gao)(gao)壓(ya)過熱器(qi)出口的(de)高(gao)(gao)(gao)溫高(gao)(gao)(gao)壓(ya)蒸(zheng)汽(qi)輸送(song)到汽(qi)輪機高(gao)(gao)(gao)壓(ya)缸進口，通過高(gao)(gao)(gao)壓(ya)主汽(qi)閥(fa)(fa)和高(gao)(gao)(gao)壓(ya)調節閥(fa)(fa)組合閥(fa)(fa)(簡稱高(gao)(gao)(gao)壓(ya)主汽(qi)聯合閥(fa)(fa))進入(ru)高(gao)(gao)(gao)壓(ya)缸做(zuo)功(gong)。

(2)再(zai)(zai)(zai)熱(re)(re)(re)蒸汽系統(tong)再(zai)(zai)(zai)熱(re)(re)(re)蒸汽系統(tong)又分冷再(zai)(zai)(zai)熱(re)(re)(re)蒸汽系統(tong)和熱(re)(re)(re)再(zai)(zai)(zai)熱(re)(re)(re)蒸汽系統(tong)。冷再(zai)(zai)(zai)熱(re)(re)(re)蒸汽系統(tong)將高(gao)壓(ya)缸(gang)(gang)排汽輸送(song)到余熱(re)(re)(re)鍋爐(lu)再(zai)(zai)(zai)熱(re)(re)(re)器(qi)人口(kou)，并(bing)與中壓(ya)過熱(re)(re)(re)蒸汽匯(hui)合；熱(re)(re)(re)再(zai)(zai)(zai)熱(re)(re)(re)(HRH)蒸汽系統(tong)將來自余熱(re)(re)(re)鍋爐(lu)再(zai)(zai)(zai)熱(re)(re)(re)器(qi)出口(kou)的再(zai)(zai)(zai)熱(re)(re)(re)蒸汽輸送(song)到汽輪(lun)機中壓(ya)缸(gang)(gang)入口(kou)，通過兩組中壓(ya)主(zhu)汽閥(fa)和中壓(ya)調節閥(fa)(簡稱中壓(ya)蒸汽聯合閥(fa))進人中壓(ya)缸(gang)(gang)做(zuo)功。

(3)低(di)(di)壓蒸(zheng)(zheng)汽(qi)(qi)(qi)(qi)(qi)系(xi)(xi)(xi)統低(di)(di)壓蒸(zheng)(zheng)汽(qi)(qi)(qi)(qi)(qi)系(xi)(xi)(xi)統將來自余熱(re)(re)(re)鍋爐低(di)(di)壓過熱(re)(re)(re)器(qi)出口的蒸(zheng)(zheng)汽(qi)(qi)(qi)(qi)(qi)輸(shu)送到汽(qi)(qi)(qi)(qi)(qi)輪(lun)機低(di)(di)壓缸入口，通過低(di)(di)壓主(zhu)汽(qi)(qi)(qi)(qi)(qi)閥和(he)低(di)(di)壓調節閥在連通管內與中壓排汽(qi)(qi)(qi)(qi)(qi)混(hun)合(he)，進入低(di)(di)壓缸做功，乏汽(qi)(qi)(qi)(qi)(qi)最終排入冷凝器(qi)。主(zhu)蒸(zheng)(zheng)汽(qi)(qi)(qi)(qi)(qi)系(xi)(xi)(xi)統包含高壓主(zhu)蒸(zheng)(zheng)汽(qi)(qi)(qi)(qi)(qi)系(xi)(xi)(xi)統、中壓(再(zai)(zai)(zai)熱(re)(re)(re))主(zhu)蒸(zheng)(zheng)汽(qi)(qi)(qi)(qi)(qi)系(xi)(xi)(xi)統和(he)低(di)(di)壓主(zhu)蒸(zheng)(zheng)汽(qi)(qi)(qi)(qi)(qi)系(xi)(xi)(xi)統三個(ge)部分。其中，中壓主(zhu)蒸(zheng)(zheng)汽(qi)(qi)(qi)(qi)(qi)系(xi)(xi)(xi)統又分為(wei)兩部分，高壓缸排汽(qi)(qi)(qi)(qi)(qi)至鍋爐再(zai)(zai)(zai)熱(re)(re)(re)器(qi)入口部分稱為(wei)冷再(zai)(zai)(zai)熱(re)(re)(re)蒸(zheng)(zheng)汽(qi)(qi)(qi)(qi)(qi)系(xi)(xi)(xi)統；鍋爐再(zai)(zai)(zai)熱(re)(re)(re)器(qi)出口至中壓缸部分稱為(wei)熱(re)(re)(re)再(zai)(zai)(zai)熱(re)(re)(re)蒸(zheng)(zheng)汽(qi)(qi)(qi)(qi)(qi)系(xi)(xi)(xi)統。主(zhu)蒸(zheng)(zheng)汽(qi)(qi)(qi)(qi)(qi)系(xi)(xi)(xi)統采用(yong)單(dan)元制的連接方式，結構簡單(dan)、閥門少、阻力(li)小(xiao)，有利于(yu)整(zheng)套機組(zu)的自動化控(kong)制與減少管道損失。

(1)高(gao)壓(ya)主(zhu)(zhu)(zhu)(zhu)蒸汽(qi)(qi)(qi)系統高(gao)壓(ya)過(guo)(guo)熱蒸汽(qi)(qi)(qi)由余熱鍋爐的(de)高(gao)壓(ya)過(guo)(guo)熱器(qi)聯箱(xiang)出(chu)口(kou)引出(chu)，經過(guo)(guo)高(gao)壓(ya)主(zhu)(zhu)(zhu)(zhu)汽(qi)(qi)(qi)聯合閥進(jin)入(ru)汽(qi)(qi)(qi)輪機高(gao)壓(ya)汽(qi)(qi)(qi)缸噴(pen)嘴室，去高(gao)壓(ya)汽(qi)(qi)(qi)缸膨脹(zhang)做功。主(zhu)(zhu)(zhu)(zhu)汽(qi)(qi)(qi)聯合閥MSCV由主(zhu)(zhu)(zhu)(zhu)蒸汽(qi)(qi)(qi)截止閥SV和主(zhu)(zhu)(zhu)(zhu)蒸汽(qi)(qi)(qi)控制閥CV串聯而成，在主(zhu)(zhu)(zhu)(zhu)汽(qi)(qi)(qi)聯合閥前(qian)有一條高(gao)壓(ya)蒸汽(qi)(qi)(qi)的(de)旁路(lu)管道，在必要時將多余的(de)高(gao)壓(ya)蒸汽(qi)(qi)(qi)。

(2)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)主(zhu)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)統(tong)(tong)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)主(zhu)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)統(tong)(tong)依(yi)據(ju)再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)的(de)(de)(de)前(qian)(qian)后劃分(fen)，可(ke)分(fen)為冷再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)統(tong)(tong)和(he)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)統(tong)(tong)兩(liang)部(bu)分(fen)。冷再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)統(tong)(tong)為：蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)輪(lun)(lun)機(ji)(ji)的(de)(de)(de)高壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)缸(gang)(gang)排汽(qi)(qi)(qi)經冷再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)管(guan)道回到余熱(re)(re)(re)(re)(re)(re)(re)(re)(re)鍋(guo)(guo)爐(lu)(lu)(lu)，在進入再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)之前(qian)(qian)與余熱(re)(re)(re)(re)(re)(re)(re)(re)(re)鍋(guo)(guo)爐(lu)(lu)(lu)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)過熱(re)(re)(re)(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)出來(lai)的(de)(de)(de)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)混合，進入再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)。熱(re)(re)(re)(re)(re)(re)(re)(re)(re)再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)系(xi)統(tong)(tong)為：從余熱(re)(re)(re)(re)(re)(re)(re)(re)(re)鍋(guo)(guo)爐(lu)(lu)(lu)的(de)(de)(de)再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)聯(lian)(lian)(lian)箱出口的(de)(de)(de)再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)，直接接至蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)輪(lun)(lun)機(ji)(ji)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)缸(gang)(gang)的(de)(de)(de)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)主(zhu)汽(qi)(qi)(qi)閥和(he)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)調節閥，進入汽(qi)(qi)(qi)輪(lun)(lun)機(ji)(ji)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)部(bu)分(fen)做功(gong)。來(lai)自(zi)余熱(re)(re)(re)(re)(re)(re)(re)(re)(re)鍋(guo)(guo)爐(lu)(lu)(lu)再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)的(de)(de)(de)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)，經過兩(liang)只并(bing)聯(lian)(lian)(lian)的(de)(de)(de)再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)聯(lian)(lian)(lian)合閥進入蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)輪(lun)(lun)機(ji)(ji)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)汽(qi)(qi)(qi)缸(gang)(gang)噴嘴室，去中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)汽(qi)(qi)(qi)缸(gang)(gang)膨脹做功(gong)。再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)聯(lian)(lian)(lian)合閥CRV由再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)控制閥IV和(he)再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)截止閥RSV串聯(lian)(lian)(lian)而成。來(lai)自(zi)余熱(re)(re)(re)(re)(re)(re)(re)(re)(re)鍋(guo)(guo)爐(lu)(lu)(lu)過熱(re)(re)(re)(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)的(de)(de)(de)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)過熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)和(he)高壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)汽(qi)(qi)(qi)缸(gang)(gang)排出的(de)(de)(de)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)匯合后進人余熱(re)(re)(re)(re)(re)(re)(re)(re)(re)鍋(guo)(guo)爐(lu)(lu)(lu)再(zai)(zai)(zai)(zai)(zai)熱(re)(re)(re)(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)。在匯合前(qian)(qian)，來(lai)自(zi)余熱(re)(re)(re)(re)(re)(re)(re)(re)(re)鍋(guo)(guo)爐(lu)(lu)(lu)過熱(re)(re)(re)(re)(re)(re)(re)(re)(re)器(qi)(qi)(qi)的(de)(de)(de)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)過熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)經氣動調壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥調壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)，所以機(ji)(ji)組運行(xing)(xing)時調壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥執行(xing)(xing)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)控制，完成中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)過熱(re)(re)(re)(re)(re)(re)(re)(re)(re)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)與高壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)汽(qi)(qi)(qi)缸(gang)(gang)排汽(qi)(qi)(qi)的(de)(de)(de)并(bing)汽(qi)(qi)(qi)任務。在調壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥前(qian)(qian)有一(yi)條中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)的(de)(de)(de)旁路管(guan)道，在必要時將多余的(de)(de)(de)中(zhong)(zhong)(zhong)(zhong)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)蒸(zheng)(zheng)(zheng)(zheng)(zheng)(zheng)汽(qi)(qi)(qi)經減溫、減壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)后排向凝(ning)汽(qi)(qi)(qi)器(qi)(qi)(qi)。

(3)低(di)(di)(di)(di)壓(ya)(ya)(ya)(ya)蒸(zheng)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)系統(tong)來自余(yu)熱(re)鍋爐的(de)低(di)(di)(di)(di)壓(ya)(ya)(ya)(ya)過(guo)熱(re)蒸(zheng)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)，經過(guo)低(di)(di)(di)(di)壓(ya)(ya)(ya)(ya)蒸(zheng)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)進(jin)(jin)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)截(jie)(jie)止閥ASV和低(di)(di)(di)(di)壓(ya)(ya)(ya)(ya)蒸(zheng)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)進(jin)(jin)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)控制閥ACV，將(jiang)低(di)(di)(di)(di)壓(ya)(ya)(ya)(ya)過(guo)熱(re)蒸(zheng)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)匯流(liu)到汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)輪機(ji)中壓(ya)(ya)(ya)(ya)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)缸(gang)和低(di)(di)(di)(di)壓(ya)(ya)(ya)(ya)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)缸(gang)之間(jian)的(de)聯通(tong)管(guan)內，去低(di)(di)(di)(di)壓(ya)(ya)(ya)(ya)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)缸(gang)膨脹做功。低(di)(di)(di)(di)壓(ya)(ya)(ya)(ya)蒸(zheng)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)進(jin)(jin)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)截(jie)(jie)止閥ASV和低(di)(di)(di)(di)壓(ya)(ya)(ya)(ya)蒸(zheng)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)進(jin)(jin)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)控制閥ACV都是帶液壓(ya)(ya)(ya)(ya)執行(xing)機(ji)構的(de)蝶閥。它們之前有一條(tiao)低(di)(di)(di)(di)壓(ya)(ya)(ya)(ya)蒸(zheng)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)的(de)旁(pang)路合(he)金管(guan)道，在(zai)必要時將(jiang)多余(yu)的(de)低(di)(di)(di)(di)壓(ya)(ya)(ya)(ya)蒸(zheng)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)經減(jian)溫、減(jian)壓(ya)(ya)(ya)(ya)后排向凝(ning)汽(qi)(qi)(qi)(qi)(qi)(qi)(qi)器。