Before steam admission , valve on vacuum hogging extraction line ( the valve is befor hogging pipe of the two stage steam jet ejector ) should be closed ( see also two stages steam jet ejector installation and operation instruction ) 在蒸汽進(jìn)入之前,抽真空啟動(dòng)管道上的閥門(mén)(啟動(dòng)抽汽器前的閥門(mén))應(yīng)該關(guān)閉(請(qǐng)參見(jiàn)相應(yīng)的兩級(jí)射汽抽氣器安裝使用說(shuō)明書(shū)) 。