The basalt casting plate manufacturer explains that the basalt casting valve is a valve that can automatically discharge condensate, air and other non condensing gases to prevent steam leakage. Cast basalt valves are mainly used for steam pipe network and equipment drainage. The cast basalt valve plays the role of steam blocking and exhaust in the steam heating system. Selecting the appropriate drain valve can make the steam heating equipment achieve high working efficiency. In order to achieve good results, it is necessary to fully understand the working performance and characteristics of various traps. There are many kinds of traps with different performance. When selecting the drain valve, first select its characteristics to meet the good operation of steam heating equipment, and then consider other objective conditions to make the required drain valve correct and effective. The drain valve must be able to "identify" steam and condensate in order to play the role of drainage and steam resistance. The identification of "steam and condensate" is based on the three principles of density difference, temperature difference and phase change. Traps can be divided into three categories: mechanical traps, thermostatic traps and thermal traps.