Rising the temperature continuously , when it in the valves runs over the temperature of drainage, the detrusion of top material causes the port A close.

阀门有一定开度，开始工作时，冷凝水与A口迅速排放。着度升高，件(阀芯)内的顶杆，向A口移动。

Rising the temperature continuously , when it in the valves runs over the temperature of drainage, the detrusion of top material causes the port A close.

度继续升高，阀内度超过该阀件所排水度时，顶杆的位移使A口关闭。