Cage apparatus for fluid valves

A pressure relief valve comprising:

• a valve body defining a fluid passageway between an inlet and an outlet;
• a nozzle coupled to the valve body, the nozzle defining the inlet of the valve body, the nozzle having a sealing surface defining an orifice of the fluid passageway;
• a disc holder movably coupled to the valve body, the disc holder to move relative to sealing surface to control fluid flow through the fluid passageway;
• and
• a cage coupled to the nozzle, the cage having a lip tapered toward a central axis of the cage.

A trim assembly for a pressure relief valve comprising:

• a disc;
• a disc holder to retain the disc;
• a nozzle, the disc to move relative to the nozzle to control fluid flow through a fluid valve;
• and
• a cage having a central bore to slidably receive the disc, the cage having a first end and a second end opposite the first end and a side surface between the first and second ends, the side surface having a plurality of passages radially spaced relative to a longitudinal axis of the central bore, the cage including a boss protruding within the central bore and extending from the second end toward the first end.