| 摘要 |
A quick shut-off device for attachment to the side of a liquid filled container to measure the amount of liquid therein. Upper and lower valves with a sight glass extending between them are provided with ball valves to allow the on-off positions of the upper and lower valves to be controlled by a 90 DEG change in position of rods connected to the ball valves. In the closed position of both valves, the interior of the sight glass and the main ball valve passageways are in alignment for easy cleaning without sight glass removal. The upper and lower valves are identical in construction so they can be readily interchanged.
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