| 摘要 |
PURPOSE: A safety valve of gas is provided to prevent an accident of gas by detecting a problem of a gas equipment and a machinery with a difference of gas pressure and by alarming with checking visually and auditorily from an outside of the valve before using a gas. CONSTITUTION: A lever is pushed to open a first ball(210) and a power is inputted during turning on a first lead switch by moving a first magnet inside an influent area of the first lead switch. A performance of an examining function is informed by lighting a green lamp. When a gas pressure inside a normal pressure area(10) of an examining valve(100) and a gas pressure inside a ventilating passage of gas(301) are different, a second magnet turns on a second lead switch(504) in an extended state of a bellows of an elastic member. A red light is turned on and an alarming sound is generated. A second ball is opened again by rotating a sub gear at 180 degrees with a main gear in a state normally flowed the gas by completely opening the first ball and a second ball in a state rotated the lever at 90 degrees. The normal pressure area(110) is sealed by the second ball in a state embedded the using normal pressure.
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