SEAL ASSEMBLIES FOR USE WITH FLUID VALVES

摘要

Seal assemblies for use with fluid valves are described. An example apparatus includes a cage; a plug including a seal gland; and means for sealingly engaging an inner surface of the cage at least partially positioned in the seal gland and including a first portion and a second portion, in response to a fluid acting on the first portion in a first direction, the first portion to engage, outwardly urge, and splay the second portion to sealingly engage the cage, in response to the fluid acting in a second direction, the second portion to deter the fluid from acting on the first portion, the first direction opposite the second direction.

主权项

1. An apparatus, comprising:
a cage; a plug including a seal gland; a retainer coupled to the plug; a unidirectional seal disposed within the seal gland, the seal having a first aperture and a second aperture, the first aperture and the second aperture having respective openings facing the retainer, the retainer to engage a first end of the seal defining the first aperture, the seal confined between the retainer and a surface of the seal gland opposite the retainer; and a back-up ring including a tapered protrusion, the back-up ring disposed within the first aperture, the tapered protrusion extending into the second aperture, a fluid to act on a first surface of the back-up ring to urge the tapered protrusion to move into the second aperture, an engagement between the tapered protrusion and the second aperture to outwardly urge and splay the seal into sealing engagement with an inner surface of the cage, the back-up ring being disposed within the first aperture to deter the fluid from acting on a second surface of the back-up ring, the first surface opposite the second surface.