摘要 |
<p>A valve assembly (30) to control the intake of fluid. The valve assembly has a valve body and a valve choke (80) disposed therein. The valve choke has a choke bore (84) through the interior of the valve choke. The valve choke has a plurality of orifices (86) to the choke bore spaced at intervals along the valve choke. A seal is disposed between the valve body and valve choke. The valve system is operable to position the valve choke so that the seal (90) is positioned between the valve body and the valve choke at the intervals between the plurality of orifices.</p> |