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.

阀门有一定度，作时，冷凝水与空气从A迅速排放。着温度升高，感温元件(阀芯)内的顶，A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.

温度继续升高，阀内温度超过该阀感温元件所排水温度时，顶的位移使A关闭。