| 摘要 |
Disclosed herein is an automatic valve device which controls fluid flow in a pipe. The automatic valve device of the present invention detects leakage of fluid or abnormal fluid flow. The automatic valve device, having a space therein, is open at a first end thereof and has at a second end thereof a fluid flow closing part, that is, a fluid shut-off valve. The automatic valve device includes a differential pressure detecting body which operates the shut-off valve and is expanded or contracted depending on outside pressure. Furthermore, the differential pressure detecting body communicates with an outlet of the valve device. Thus, when pressure of the outlet of the valve device is lower than that of an inlet, the differential pressure detecting body is contracted, thereby the shut-off valve is opened. Therefore, the present invention can determine whether fluid leakage occurs using the frequency that an amount of fluid greater than the volume of the differential pressure detecting body passes through the valve. |
