| 摘要 |
PROBLEM TO BE SOLVED: To provide a configuration of a meter bypass unit provided with a check valve so as to easily discharge air in a pipe after meter replacement.SOLUTION: A meter bypass unit 1 that has a flow rate selector valve 3 fitted to a base 2 upstream and a partition valve 21 fitted downstream, is fitted with a meter M between the flow rate selector valve 3 and the partition valve 21 detachably using attaching/detaching means 17 and 52, and includes a bypass pipe connecting downstream sides of the flow rate selector valve 3 and the partition valve 21 while bypassing the meter M has a check valve 31 disposed on a primary side of the partition valve 21 and is provided with a drain valve for air vent between a valve seat part of the check valve 31 and a valve body 26 of the partition valve 21. A tip of a plug 71 of the drain valve fixes a reception port. |
