Back-up rings for high pressure seals, packing assembly, and pumps incorporating same
AssigneeKMT Waterjet Systems Inc.
InventorJeffrey D. Stephens
Life of this patent
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Abstract
An improved support for a seal is provided in the form of a back-up ring that reduces or eliminates the gaps between a pump plunger and a high pressure cylinder of a pump. The support includes a back-up ring having opposed first and second faces with a wall thickness disposed between the faces. The back-up ring includes a frustro-conical concave surface on the first face and a frustro-conical convex surface on the second face. Also provided are a packing assembly including at least one back-up ring and a reciprocating pump incorporating the at least one back-up ring.
Claims20
A support for a seal of a pump, comprising:
- a back-up ring having opposed first and second faces with a wall thickness disposed between said faces, said back-up ring having a frustro-conical concave surface on said first face and a frustro-conical convex surface on said second face.
A packing assembly for sealing a gap between a pump plunger and a high pressure cylinder of a pump, comprising:
- a seal and
- at least one back-up ring for said seal, said back-up ring having opposed first and second faces with a wall thickness disposed between said faces, said back-up ring having a frustro-conical concave surface on said first face and a frustro-conical convex surface on said second face.
A reciprocating pump comprising:
- a cylinder and a reciprocating plunger disposed longitudinally therein and defining a gap between said plunger and said cylinder;
- a seal concentrically disposed in said gap between said plunger and said cylinder, and
- at least one back-up ring having opposed first and second faces with a wall thickness disposed between said faces, said back-up ring having a frustro-conical concave surface on said first face and a frustro-conical convex surface on said second face.
Dependencies are inferred from the claim text.