| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve problems that all the valves saved from damage are difficult to be turned manually to be closed, in an emergency condition of disaster where an aqueduct line and a city gas line are damaged over a wide range in an earthquake disaster, that secondary disasters of road damage and water shortage caused by a water spurt are generated to make domestic non-commercial water difficult to be secured and hindrance on health is generated thereby, when a water supply pipe and a distributing water pipe embedded in a road are damaged, and that a fire disaster is induced, for example, in damage of a city gas pipe, to expose a lot of human lives to danger by a diasaster of its secondary disaster. SOLUTION: In an aseismic disaster-preventive automatic valve, each joint pipe 2 in both sides of a valve casing 1 of which the inside is formed into an elliptical shape is connected directly by a by-pass pipe 7 provided with a sub-valve 6, and a ball body 3 pushed by a fluid to move to a pushed direction is self-contained to abut to a flow-out side pipe port so as to close it. The automatic valves are provided in important positions of a pipe line.</p> |
