| 摘要 |
The present invention relates to a device which improves vacuum valve structure to adjust the flow rate to extend the life of the device and eliminate the cause of malfunctions while increasing the safety against gas leakage. The vacuum valve according to the present invention forms an adjusting unit and a flow path to adjust the flow rate by adjusting the cross-section of the flow path circulating a fluid. The vacuum valve also includes a body unit including a pipe unit around the adjusting unit which has different cross-sections on a side and the other side to extend the life of the device and eliminate the cause of malfunctions while increasing the safety against gas leakage. |
