| 摘要 |
PURPOSE:To ensure achievement of a fuse function of a valve by making a magnet provided outside of a gas passage attract a magnetic member to the opening position of the valve only in a close vicinity to the magnetic member. CONSTITUTION:A valve plate 6 is energized with an uprising elasticity at all times by a spring 7 compressedly arranged in a gas outflow port 4. When an abnormal outflow occures from the gas outflow port 4, the gas pressure at the bottom surface of the valve plate 6 in a valve chest 2 lowers and the valve plate 6 is press-contacted to a valve seat 8. A magnet 12 which attracts a magnetic member 11 to the uprising opening position of the valve, is arranged outside of a valve case 1 in a manner that it can be freely contacted to or separated from the magnetic member 11 in a close vicinity right above the magnetic member 11. When the magnet 12 is in a separated position from the magnetic member 11, the magnetic member 11 goes down by its own weight and pushes down the valve plate 6 to the closing position of the valve. |
