| 摘要 |
PURPOSE: A check valve is provided to prevent a boiler to be heated and operated in the state in which water is not provided to the boiler, thereby preventing a harmful effect due to overheating. CONSTITUTION: A check valve comprises a body(1), an influx unit(2), an outlet unit(3), a closet seat(4), a valve body(6), and flooding expansion corpus fibrosum(7). The influx unit and outlet unitare installed in the body. The closet seat is installed in a flow path between the outlet unit and the influx unit. The valve body is installed in the closet seat using a spring. The flooding expansion corpus fibrosum is installed in the longitudinal end of the spring.
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