| 摘要 |
A composite valve plunger (10) for contacting a valve seat (14) within a fluid carrying housing (20) in a well. A valve member (16) having an arcuate surface (40) is guided by a valve stem (44) to reciprocate within the housing (20). When the valve member (16) contacts the valve seat (14), the flow of fluid through the housing (20) is blocked. The valve stem (44) can be formed with first (46) and second (48) sections. The valve member (16) can translate along the valve stem (44) or can be contained by the first (46) and second (48) valve stem sections to prevent rotational and translational movement. |
