| 摘要 |
PURPOSE:To make a warning sound generate without discharging gas in case an abnormality occurs in the inner pressure of a gas main, by equipping a by-pass line provided in the main pipeline for supplying gas with a warning sound generator having a special constitution. CONSTITUTION:A by-pass line 2 having a warning sound generator 3 interposed therein is put beside a gas main pipe 1 which connects a gas storage tank with an outlet valve leading to a medical instrument or the like. A pressure-sensitive switch device 7 having a working valve 6 is installed close to the inlet 4 of the main pipe 1 and the inlet 5 of the by-pass line. Thus, the pressure response of the device 7 turns over the working valve 6 to open or close the inlets 4 and 5 pertinently. |
