Patent ID: 7819386

Claim:
A valve assembly comprising: a valve body, said valve body having a valve body wall, an inlet, an outlet, a chamber, and at least one removable seat at one of said inlet and said outlet; an actuation sub-assembly, said actuation sub-assembly including a stem; a flow restrictor having a restrictor body and a transverse passage extending through said restrictor body, said flow restrictor positioned in said chamber adjacent said at least one removable seat and being positionable between a valve open position wherein said transverse passage provides fluid communication between said inlet and said outlet and a valve closed position wherein said restrictor body blocks the fluid communication between said inlet and said outlet; wherein when said actuation sub-assembly is mounted at said valve body said stem extends through said valve body wall for direct engagement with said restrictor body, and said valve body and said actuation sub-assembly being configured such that said actuation sub-assembly with said stem may be mounted together as a unit to said valve body after said valve body is assembled and further said actuation sub-assembly with said stem may be removed together as a unit from said valve body without requiring disassembly of said valve body; and wherein said flow restrictor is configured for re-engagement with said stem when said actuation sub-assembly is mounted to said valve body and for engagement with a stem of another actuation sub-assembly when said other actuation sub-assembly is mounted to said valve body.