| 摘要 |
PURPOSE: An apparatus for deciding the center is provided to improve the installation of a gas circuit breaker by automatically setting the center of rotary axes for a gas circuit breaker and a ball valve. CONSTITUTION: A gas circuit breaker(2) is installed on a gas pipe(3) by the steps of; inserting a rotary axis(11) of a ball valve(1) and a nut(12) connected to the axis into an insertion groove(22A) formed on the lower face of a nut(22); and fixing the rear part of the circuit breaker through fixing holes(24) to maintain the center of the rotary axes for the gas circuit breaker and the ball valve through the nut(22) so a user as to easily install the gas circuit breaker. Also, the reliability as a gas safety system is improved by completely isolating gas through the exact action of the ball valve.
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