| 摘要 |
A maintenance ball valve is provided to prevent a suction pump from being damaged due to vacuum state, and stably accomplish an operation mode, a calibration mode, and a fuzzy mode in a single valve body. A maintenance ball valve comprises a hollow(11) whose top is open in the center; an inlet port drawing in sample gas around the center shaft of the hollow; a sampling port(13) for supplying sample gas to a gas detection or analysis device; a calibration port(14) for the control of a gas detection or analysis equipment; a fuzzy port for removing the foreign substance inside a valve and an inlet pipeline; a main body(10) in which a vent hole is formed; a body in which an intake channel(33) is formed; a control member(30) equipped with a fastening shaft(34) extended from the upper portion center of the body to the upward; and a fixing member(40) fixing and holding the control member to rotate around the main body.
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