| 摘要 |
PURPOSE: A pressure relief valve is provided to prevent the reduction of opening and closing performance of a disk even in a long term use because a stem, a spring, and a diaphragm press the disk. CONSTITUTION: A pressure relief valve comprises a nozzle(20), a disk(30), a stem(40), a partition(50), a cover(60), a diaphragm(70), a mechanical pilot valve(200), and an electronic solenoid valve(300). The nozzle comprises a through hole(21) and a connection hole(22). The disk is provided on the top of the nozzle and opens and closes the through hole. The stem comprises a spring(41) and supports the disk in order to the upward motion of the disk caused by water hammering pressure. The partition is fixed separate from the top of the nozzle by a fixture(90) and comprises a stem bush(51). The cover comprises a space part and an adjusting hole(62). The diaphragm is fixed to the top of the stem and applies pressure to the disk. The mechanical pilot valve, when water hammering pressure flows into the connection hole, compares the water hammering pressure with the set pressure and sends pressure to the cover in order to actuate the diaphragm. The electronic solenoid valve, when water hammering pressure flows into the connection hole, compares the water hammering pressure with the set pressure and sends pressure to the cover in order to actuate the diaphragm. The electronic solenoid valve and the mechanical pilot valve operate separately or simultaneously.
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