Patent ID: 8176936

Claim:
A fluid shutoff device which is provided separately from a flow measuring unit which measures a flow amount of fluid, comprising: an inlet connector and an outlet connector removably connectable in series to a piping for delivering the fluid, one of which is connectable to one of an inlet and an outlet of the flow measuring unit; a fluid passage that extends from the inlet connector to the outlet connector to flow the fluid therethrough; a cutoff valve that is disposed in the fluid passage and comprises a valve body and a valve seat configured to cooperate with each other to open and close the fluid passage; a cutoff valve driving device configured to electrically drive the cutoff valve to open and close the fluid passage, wherein the cutoff valve driving device has a conducting portion disposed outside the fluid passage; a communicating portion configured to conduct bidirectional radio communications with an external device; a controller responsive to a cutoff/return command received from the external device via the communicating portion to operate the cutoff valve driving device to open or close the fluid passage and output, in response to the command, a response signal to the external device via the communicating portion; a battery that supplies electric power to the controller, the communicating portion, and the cutoff valve driving device via the controller; and a piping disconnection detector disposed in the fluid passage to detect disconnection of the fluid cutoff device from the piping, wherein when the piping disconnection detector detects disconnection of the fluid cutoff device from the piping, the controller outputs a signal to the external device via the communicating portion to notify disconnection of the fluid cutoff device.