Tubular flow conduit with in-line integrated check valve and method of making same
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United States of America Patent
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Jan 3, 2006
Grant Date -
Feb 24, 2005
app pub date -
Aug 19, 2003
filing date -
Aug 19, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An integrated in-line tube and check valve assembly fabricated by end-form mandrel expanding an outlet end portion of deformable tube stock, such as metal, of nominal starting diameter, and concurrently end-forming a valve seat on the inside of the expanded tube section where it necks down and integrally joins the upstream nominal diameter portion of the tube. A valve ball and a valve spring are then fitted into the expanded tube section, together with a spring holder if needed. The expanded end portion of the tube is then again deformed by an end-form swaging operation that reduces the diameter of the expanded tube outlet end so as to form a cavity within the tube in which the spring is captured in compression for resiliently biasing the valve ball against the valve seat.
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