Valve assembly for admitting liquid fluid into hollow interior of bailer, e.g. used for taking liquid sample in laboratory tests

摘要

The valve body is in the form of a hemispherical ball is mounted at the lowermost end of a straight valve stem. The hemispherical ball seats in a valve seat that matches the contour of the hemispherical exterior surface of the ball. The valve body and the matching valve seat may be both frusto-conical in configuration or tapered downwardly to form an elongate, narrow slot. The valve stem is slideably received within and guided by a central bore formed in a support member that spans the hollow interior of the lowermost end of the bailer, and the valve body is covered with a cushioned material ofuniform thickness. The cushioned material is deformed by particulate matter but seals around such matter so that leak-free seating of the valve body against the valve seat is achieved even when particulate matter is disposed between the valve body and the valve seat. Moreover, the flexibility and resilience of the cushioned material enables it to seal valve bodies and valve seats that are out-of-round or otherwise outside of manufacturing tolerances.