Main gas supply shut-off device at the time of occurrence of an abnormality in the backup supply device of gas

摘要

PURPOSE: To supply a spare backup gas without momentary interruption even when an abnormality occurs at the feed of artificial air to a hospital, and ensure a high reliability having no danger on the life of a patient. ;CONSTITUTION: Normal close type and normal open type automatic cutoff valves 3a, 3b and a connecting part 6 for setting the gas pressure of a backup gas BG lower than that of a main gas MG and preferentially supplying the main gas MG to a hospital in normal state are interposed in series to an outlet 2a in a main gas feed piping 2 delivered from a main gas feeding device 1 for artificial air. When abnormality input signals S₁, S₂ from the main gas feeding device 1 are inputted to one system having no failure of first and second electric control systems 7a, 7b, one of the solenoid cutoff valves 3a, 3b is interrupted to close the main gas MG, and the backup gas BG is switched and supplied to the hospital from the connecting part 6 without momentary interruption. When the service a commercial power source 8a is interrupted, also, the normal close type automatic cutoff valve 3a is closed.;COPYRIGHT: (C)1996,JPO