| 摘要 |
A bailer (10) having a slow rate of descent into a liquid body to minimize agitation. In a first embodiment, a plug closes the upper end of the bailer and a perforation (34) is formed in the plug. Air in the hollow interior of the tubular main body (16) of the bailer is constrained to flow through the perforation as the bailer fills. A back pressure created by the air prevents rapid descent of the bailer and thus prevents rapid filling of the bailer. When the bailer is being emptied, the perforation prevents a vacuum from forming in the space below the plug and above the liquid level, but it provides a partial vacuum and therefore slows down the rate of flow of the liquid as it exits the bailer. Covering the perforation with a thumb creates a vacuum above the liquid level and stops the flow of liquid from the bailer. This eliminates the need for a tool that unseats the valve of the bailer from its valve seat. In another embodiment, the perforation is eliminated and rings are secured to the tubular main body of the bailer to slow its rate of descent. Additional embodiments include a baffle wall for slowing bailer descent and a stabilizer tube at the lowermost end of the bailer for maintaining the bailer in an upright configuration during its descent.
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