| 摘要 |
A valve assembly for limiting the flow of fluid into and out of a chamber, consisting of: a valve seat in a wall of the chamber, wherein fluid flows into and out of the chamber through the valve seat; a valve face engaging the valve seat, wherein the valve face is external to the chamber; and a mechanism for moving the valve face toward and away from the valve seat wherein the valve face is substantially removed from the path of fluid flow through the valve seat when the valve face is moved away from the valve seat.
|
