它由电磁线圈、阀芯、复位弹簧和外壳组成，阀芯由挡铁，动杆和密封垫构成。
The valve consists of an electromagnetic loop, a valve core, a replacement spring and a shell and the valve core consists of a retaining iron, a movable bar and a sealing pad.
链条炉排尾部的挡渣铁最多使用一个采暖期，每年均须更换挡渣铁。
Analyses that the slag iron of chain grate tail use at most one heating term, which must be changed every year.
用耐火混凝土挡渣墙可以代替挡渣铁，且费用低，使用寿命长。
Fireproof concrete not only can be taken the place of slag iron, but also the cost is lower and use life is longer.
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