| 摘要 |
An arrangement for controlling fluid communication between the interior of a tubular member and interior of an inflatable element supported externally on the tubular member including fluid passage means communicating from the interior of the tubular member to the interior of the inflatable element with valve means normally seated to close off flow from the interior of the tubular member to the interior of the inflatable element until a predetermined pressure has been exerted thereon. After the valve has been opened to communicate fluid from the interior of the tubular member to the interior of the inflatable element for inflation thereof, the valve closes when a predetermined relationship is reached between the pressure in the interior of the tubular member and externally of the tubular member. Locking means are provided to lock the valve in closed position and prevent further communication between the interior of the tubular member and interior of the inflatable element when the valve closes.
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