| 摘要 |
A valve assembly is installed within a wellhead such as a conventional tubing hanger or casing hanger used to suspend pipe or other tubular goods in a well. A seal bushing assembly (10) is installed in a tubing head assembly (200) or other wellhead component. A hanger valve assembly (50) is stung into the seal bushing assembly and includes a valve (60) that can be selectively opened or closed. In the open position, the valve does not restrict a central flow path diameter through the hanger and wellhead. In the closed position, the valve contains pressure and/or fluid flow and fully seals against wellbore pressure acting on the valve. A wellhead adapter (30) covers the hanger valve assembly and provides an attachment point for a conventional Christmas tree or other wellhead equipment. |
