Wells – Valves – closures or changeable restrictors
Patent
1979-02-21
1981-10-20
Leppink, James A.
Wells
Valves, closures or changeable restrictors
29237, 29464, 29525, 166 71, 166242, 285369, E21B 4310, B23P 1904, B23Q 300, F16L 2104
Patent
active
042955262
ABSTRACT:
The method comprises providing an extremely strong and elastic alloy steel ring having a inner diameter substantially smaller than the outer diameter of the pipe to be joined, and an outer diameter much larger than such outer diameter of the pipe. Great axial forces are then employed to insert the pipe ends into the ring until an internal flange is abutted, thus stretching the ring without causing it to exceed its elastic limit. End seals are provided on the flange faces and are pinched off by the pipe ends, so that metal-to-metal contact results. Prior to forcing the pipe ends into the ring, it is mounted in an internal groove in a hinged clasp which aligns the pipe ends.
The apparatus comprises the ring, the clasp and the seals, and further comprises the completed joint wherein the ring is under continuous great hoop stress.
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Hauk Ernest D.
Stewart Larry
Leppink James A.
Service Equipment Design Co., Inc.
Suchfield George A.
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