US 6,981,512 B2
Tubular flow conduit with in-line integrated check valve and method of making same
David L. Meyer, Archbold, Ohio (US)
Assigned to Dana Corporation, Toledo, Ohio (US)
Filed on Aug. 19, 2003, as Appl. No. 10/643,705.
Prior Publication US 2005/0039798 A1, Feb. 24, 2005
Int. Cl. F16K 15/04 (2006.01); B21D 1/24 (2006.01); B21D 39/20 (2006.01); B21D 53/10 (2006.01)
U.S. Cl. 137—15.22 15 Claims
OG exemplary drawing
 
1. A method of assembling a check valve into a tube of deformable material, which comprises:
(a) expanding an end portion of said tube,
(b) forming a valve seat within said end portion expanded in said step (a) where the expanded end portion joins the remainder of the tube,
(c) positioning a valve element within said expanded end portion with said element seated against said seat, and
(d) deforming said end portion by reducing the diameter of a portion of said end portion to form a valve casing cavity operable to capture said valve element within said tube for operably opening and closing against said seat by movement of said valve element in said cavity.