Abstract: Valves and trim assemblies for valves are described herein. An example valve disclosed herein includes a valve body defining a fluid passageway between an inlet and an outlet and a trim assembly coupled the valve body. The trim assembly includes a cage having a central channel. The trim assembly also includes a seat in the fluid passageway. The seat defines an orifice. The seat is coupled to the cage such that removal of the cage from the valve body also removes the seat from the valve body. Further, the trim assembly includes a flow control member in the central channel of the cage. The flow control member is moveable relative to the seat between an open position and a closed position.

Abstract: Valve sealing structures are disclosed. An example apparatus includes a valve body including a seat, and a valve plug including a disc holder including a recess; a seat ring positioned in the recess, the seat ring including a first surface and a second surface contiguous with the first surface, the first surface to contact the seat when the valve plug is in a closed position; and a disc cover coupled to the disc holder, the disc cover including a third surface and a fourth surface contiguous with the third surface, the third surface to be flush with the first surface, the fourth surface to contact the second surface and apply an axial pre-load force to the seat ring.

Abstract: Valves and trim assemblies for valves are described herein. An example valve disclosed herein includes a valve body defining a fluid passageway between an inlet and an outlet and a trim assembly coupled the valve body. The trim assembly includes a cage having a central channel. The trim assembly also includes a seat in the fluid passageway. The seat defines an orifice. The seat is coupled to the cage such that removal of the cage from the valve body also removes the seat from the valve body. Further, the trim assembly includes a flow control member in the central channel of the cage. The flow control member is moveable relative to the seat between an open position and a closed position.