The main body and sheet are of one piece, making it highly durable in high temperature and high pressure, and thus appropriate for steam engines or nuclear power generators. The structure is simple and repair is easy. The disk has undergone thermal treatment for increased hardness and greater durability. The thermal insulating cap was designed to prevent any impact from the exterior air. The built-in strainer prevents breakdowns or errors caused by impurities. When selecting the size of the trap, select one that is 3 times that of the necessary capacity for the trap. (This is dependent on the type of equipment and operational conditions.)