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US 8,517,046 B2Granted
Redundant metal-to-metal seals for use with internal valves
AssigneeEmerson Process Management Regulator Technologies, Inc.
InventorsChun Lin, Roy Ronald Pelfrey, Eric Alan Miller
Life of this patent
Estimating the term…
Abstract
Redundant metal-to-metal seals for use with internal valves are described. A plug having redundant sealing functionality for use with a poppet of an internal valve includes a tapered surface to sealingly engage a seat of the poppet. Additionally, the plug includes a seal adjacent the tapered surface and disposed in a groove defined by the plug to sealingly engage the seat.
Claims18
A plug having redundant sealing functionality for use with a poppet of an internal valve, the plug comprising:
- a first retainer;
- a second retainer seated on a stem, the first retainer to be removably coupled to the second retainer by direct connection to the stem, the first retainer comprising a first tapered surface, the second retainer comprising a second tapered surface, the tapered surfaces to sealingly engage a seat of the poppet;
- and
- a seal adjacent the tapered surfaces and disposed in a groove defined by the first and second retainers to sealingly engage the seat, the tapered surfaces to interact with the seat of the poppet to substantially prevent an end of a stem to which the plug is coupled from engaging a cam of the internal valve when the seal is worn or dislodged and the internal valve is in a closed position.
1 more element
A stem assembly for use with an internal valve, comprising:
- a stem having a first end to be engaged by a cam of the internal valve to move the stem to control fluid flow through the internal valve;
- and
- a plug coupled to a second end of the stem opposite the first end, the plug comprising a first plug portion and a second plug portion, one of a fastener, the first plug portion, or the second plug portion to threadably engage the stem to couple the first and second plug portions to the stem, the plug comprising a first sealing surface and a second sealing surface, wherein the first and second sealing surfaces are to engage a seat of a poppet of the internal valve to provide redundant sealing functionality.
An internal valve, comprising:
- a body that defines a chamber, wherein the body includes external threads to threadably engage another body;
- a stem assembly having at least one biasing element, a stem, and a plug, wherein the stem assembly is to exert a force on a poppet to urge the poppet toward the body to control fluid flow through the internal valve, the plug comprising a first plug portion and a second plug portion, one of a fastener, the first plug portion, or the second plug portion to threadably engage the stem to couple the first and second plug portions to the stem;
- a seal coupled to the stem assembly;
- a cam rotatably coupled to the internal valve to engage an end of the stem assembly to control fluid flow through the internal valve;
- and
- means for maintaining a gap between the end of the stem assembly and the cam when the seal is worn or dislodged and the internal valve is in a closed position.
3 more elements
An assembly for use with an internal valve, comprising:
- a poppet including a tapered seat and an aperture to receive a stem, the stem having a first end to be engaged by a cam of the internal valve to move the stem to control fluid flow through the internal valve;
- and
- a plug coupled to a second end of the stem opposite the first end, the plug comprising a first tapered surface, a second tapered surface and a seal positioned in a groove between the first and second tapered surfaces, wherein the tapered surfaces and the seal are to engage the tapered seat of the poppet to provide redundant sealing functionality, the tapered surfaces to interact with the seat of the poppet to substantially prevent the first end of the stem from engaging the cam when the seal is worn or dislodged and the internal valve is in a closed position, the plug comprising a first plug portion and a second plug portion, one of a fastener, the first plug portion, or the second plug portion to threadably engage the stem to couple the first and second plug portions to the stem.
Dependencies are inferred from the claim text.