| 摘要 |
A substantially leak-free bailer includes an improved valve assembly at its lowermost end. A valve body is mounted to the lowermost end of a valve stem and the valve stem is slideably received within and guided by a central bore formed on a support member that spans the hollow interior of the bailer at its lowermost end. The valve body may be hemispherical, frusto-conical, or elongate and downwardly tapered. The valve seat is configured to match the contour of the valve body. An annular ridge circumscribes the valve seat and serves as a barrier to particulate matter so that the valve body sits in the valve seat without interference from such particulate matter.
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