Valves and trim assemblies for valves

A valve comprising:

• a valve body defining a fluid passageway between an inlet and an outlet;
• and
• a trim assembly coupled to the valve body, the trim assembly including:
• a plug, the plug threadably coupled to the valve body, the plug having a bore;
• a cage coupled to the plug, the cage having a central channel;
• a seat in the fluid passageway, the seat defining an orifice, the seat coupled to the cage such that removal of the cage from the valve body also removes the seat from the valve body;
• a flow control member in the central channel of the cage, the flow control member extending into the bore of the plug, the flow control member moveable relative to the seat between an open position and a closed position;
• a first bushing between the flow control member and an inner surface of the cage defining the central channel;
• and
• a second bushing between the flow control member and an inner surface of the plug defining the bore.

A valve comprising:

• a valve body defining a fluid passageway between an inlet and an outlet;
• and
• a trim assembly coupled to the valve body, the trim assembly including:
• a plug, the plug threadably coupled to the valve body, the plug having a bore;
• a cage coupled to the plug, the cage having a central channel;
• a seat in the fluid passageway, the seat defining an orifice, the seat coupled to the cage such that removal of the cage from the valve body also removes the seat from the valve body;
• a flow control member in the central channel of the cage, the flow control member extending into the bore of the plug, the flow control member moveable relative to the seat between an open position and a closed position;
• and
• a spring to bias the flow control member toward the seat, the flow control member including a disc body, the spring disposed around the disc body.

A valve comprising:

• a valve body defining a fluid passageway between an inlet and an outlet;
• and
• a trim assembly coupled to the valve body, the trim assembly including:
• a plug coupled to the valve body, the plug defining a bore;
• a cage having a central channel;
• a seat in the fluid passageway, the seat defining an orifice, the seat coupled to the cage such that removal of the cage from the valve body also removes the seat from the valve body;
• and
• a flow control member in the central channel of the cage, the flow control member moveable relative to the seat between an open position and a closed position, wherein the flow control member is at least partially disposed in the bore of the plug, wherein a balance chamber is defined in the bore between an end of the flow control member and an inner surface of the bore, wherein the flow control member has a balance passage extending between a first opening on an outer side surface of the flow control member exposed to the fluid passageway and a second opening on the end of the flow control member to enable fluid communication between the fluid passageway and the balance chamber, and wherein the outer side surface of the flow control member has an annular groove at a location of the first opening to increase pressure in the balance chamber when the flow control member is in an open position.

A valve comprising:

• a valve body defining a fluid passageway between an inlet and an outlet;
• and
• a trim assembly coupled to the valve body, the trim assembly including:
• a plug threadably coupled to the valve body;
• a trim body threadably coupled to the plug, the trim body defining a central channel, the trim body having a first portion defining a seat, a second portion defining a cage, and one or more ribs extending between the first portion and the second portion;
• and
• a flow control member in the central channel of the trim body, the flow control member moveable between an open position to enable fluid flow through the seat and a closed position in which fluid flow is blocked from flowing through the seat.

A valve comprising:

• a valve body defining a fluid passageway between an inlet and an outlet;
• and
• a trim assembly coupled to the valve body, the trim assembly including:
• a plug;
• a trim body coupled to the plug, the trim body defining a central channel, the trim body having a first portion defining a seat, a second portion defining a cage, and one or more ribs extending between the first portion and the second portion;
• a flow control member in the central channel of the trim body, the flow control member moveable between an open position to enable fluid flow through the seat and a closed position in which fluid flow is blocked from flowing through the seat;
• and
• a spring to bias the flow control member toward the seat, the spring disposed around the flow control member.

A valve comprising:

• a valve body defining a fluid passageway between an inlet and an outlet;
• and
• a trim assembly coupled to the valve body, the trim assembly including:
• a plug;
• a trim body coupled to the plug, the trim body defining a central channel, the trim body having a first portion defining a seat, a second portion defining a cage, and one or more ribs extending between the first portion and the second portion;
• a flow control member in the central channel of the trim body, the flow control member moveable between an open position to enable fluid flow through the seat and a closed position in which fluid flow is blocked from flowing through the seat;
• a first bushing between the flow control member and an inner surface of the cage;
• and
• a second bushing between the flow control member and an inner surface of the plug.

A trim assembly for a valve, the trim assembly comprising:

• a plug defining a bore, the plug to be coupled to a valve body of the valve;
• a trim body defining a central channel, the trim body having a first portion and a second portion coupled by one or more ribs, the first portion defining a seat, the second portion defining a cage, the second portion threadably coupled to the plug;
• and
• a flow control member disposed in the bore of the plug and the central channel of the trim body, the flow control member moveable relative to the seat between an open position and a closed position.