{
  "abstract": "A relief valve for a backflow preventer includes a plunger, a lock nut, and a seal. The plunger has a female fastening section and a first seal engagement surface. The lock nut has a male fastening section and a second seal engagement surface. The male fastening section is received by the female fastening section to bring the first seal engagement surface toward the second seal engagement surface. The seal is positioned between the first seal engagement surface and the second seal engagement surface.",
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  "source_date": "2026-04-14",
  "source_id": "US-12601418-B2",
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  "title": "Relief valve assembly",
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