| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-precision safety valve in which action can be easily recognized and secured. SOLUTION: This safety valve is installed on a steam boiler, a water boiler, a pressure container, etc. It employs a weld junction structure to prevent invasion of intake air through a valve element both on the primary side and the secondary side even in a condition where secondary side pressure is changed from atmospheric to vacuum, or when stopped. The valve element 64 is connected to a valve rod 66, and a lever 86 capable of pulling up the valve rod 66 is provided. In a state where pressure is not added to a device, action of the valve element 64 can be recognized or secured from the external while maintaining seal performance by pulling up the lever 86. COPYRIGHT: (C)2004,JPO&NCIPI
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