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US 11,761,287 B2Granted
Dual hardness sealing elements for blowout preventer
AssigneeLANXESS Corporation
InventorsMatthew P. Burdzy, Thomas Harald Peter
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Abstract
The present invention relates to sealing elements for blowout preventers comprising a sealing interface region, and a second region, wherein said sealing interface region is formed of a first polymer and said second region is formed of a second polymer, the first and second polymers having different Shore A hardnesses, including sealing elements made of dual hardness polyurethane.
Claims15
A sealing element for a blowout preventer comprising:
- a sealing interface region, and
- a second region,
- wherein said sealing interface region is formed of a first polymer and said second region is formed of a second polymer,
- wherein the first polymer has a yield recovery of 75% to 99%;
- wherein the first and second polymers comprise polyurethane and the first and second polymers having different Shore A hardnesses as measured by ASTM D2240-15 test method for measuring durometer hardness,
- wherein the sealing element comprises an upper portion and a lower portion and wherein either (i) the upper portion of the sealing element is formed from an 60 to <90 shore A polymer and the lower portion of the sealing element is formed from a 90 to 98 shore A polymer or (ii) the upper portion of the sealing element is formed from a 90 to 98 shore A polymer and the lower portion of the sealing element is formed from a 60 to <90 shore A polymer.
3 more elements
Dependencies are inferred from the claim text.