PURPOSE:To allow the applied voltage necessary for opening valve to be independent from production error by setting a permanent magnet in swingable state for a lever. CONSTITUTION:A permanent magnet 36 is installed onto a supporting tool 35 on the opposite side of a valve piece 33. Said permanent magnet 36 performs free swing movement for a lever 30. in correspondence with the permanent magnet 36, the lower edge surface 38 of a magnetic pole 37 is set close to a gas passage, and the permanent magnet 36 is adsorbed onto the edge surface 38 of the magnetic pole. The magnetic pole 37 and a yoke 40 form a magnetic circuit 41. When the lever 30 is turned clockwise from the closed valve state by pushing a button 44, the permanent magnet 36 approaches to the magnetic pole 37, and the permanent magnet 36 revolves by its own attraction force from a certain position and opens the valve.
展开▼
