Tubular flow conduit with in-line integrated check valve and...

Details Tubular flow conduit with in-line integrated check valve and... Tubular flow conduit with in-line integrated check valve and...

2006-01-03

2006-01-03

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Processes

Cleaning, repairing, or assembling

C137S015180, C137S315330, C137S539000, C029S890130, C029S890132, C029S441100

Reexamination Certificate

active

06981512

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.

REFERENCES:
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patent: 5582204 (1996-12-01), Hiranuma et al.
patent: 5649360 (1997-07-01), Schwarz
patent: 5799689 (1998-09-01), Tang et al.
patent: 01133634 (1989-05-01), None

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