| 摘要 |
PURPOSE:To make it possible to perform, for sure at all times the inspection of an isolation valve for the leak in it by performing setting of pressure setting means after a specified time has passed from the motion of closing the isolation valve. CONSTITUTION:The setting for a pressure setting device 2 which is provided between isolation valves 1a and 1b on the upstream side and downstream side respectively is performed after a specified time length has passed from closing the isolation valves 1a and 1b. When the fire of a burner 5 is to be extinguished, the isolation valves 1a and 1b are closed, and then after a specified time length has passed, the pressure setting device 2 is operated and the pressure in the space 4 between the isolation valves 1a and 1b is set at pressure which is different from the pressure in supplying gas. When there is a gas leak in either of the valves 1a and 1b, the gas pressure in the space 4 rises or falls with the elapse of time. Accordingly, by detecting the pressure in the space 4 after a specified time has passed from operating the pressure setting device 2 by a pressure detection device 3, it is possible to detect the presence of leak in the isolation valves 1a and 1b by judging if there is a change of pressure more than specified. |
