| 摘要 |
PURPOSE:To prevent live gas from being discharged at resetting operation of a valve, in which the connection part of a gas cock is provided and the valve is actuated by an electromagnetic operating part, by forcibly attaching a valve main unit to a valve seat through the pressure of gas and opening the valve only through release of the pressure of the gas. CONSTITUTION:If an electric current is conducted to flow in a coil 6 so as to generate magnetic flux in the same direction as a movable permanent magnet 5, the movable permanent magnet 5 is attracted to a fixed iron core 4 against a spring 12. Then a pipe 9 lifts a ball valve 7 to a valve seat position, and the ball valve 7 is forcibly attached to a valve seat 11 by a pressure of gas flowing into a valve main unit 1, then gas is shut off. Then if the coil 6 is electrically conducted so as to generate magnetic flux in the reverse direction to the movable permanent magnet 5, the pipe 9 is depressed by the spring 12. However, the ball valve 7, being pressed by the pressure of the gas, can not be detached from the valve seat 11. Accordingly, a gas cock 2 is shut off before conducting an electric current, and gas in the valve main unit 1 must be previously released by operating a manual button 15. |
