| 摘要 |
A seat element is attached by mechanically swaging, welding, or brazing to one section of tubing and comprises a radially extending cylindrical flange with exterior and interior spherical mating surfaces. A sleeve element is placed over the seat element for axial movement thereon, and is provided with an interior spherical surface for engagement with the exterior spherical surface of the seat element. An externally threaded union secured to another section of tubing or component boss is provided with a thin flexible flange which may be conical or spherically concave for engagement with the interior spherical surface of the seat element in a stressed relation when engaged by the sleeve element.
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