Backflow prevention assembly
AssigneeWatts Investment Company
InventorLester Engelmann
Life of this patent
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Abstract
A backflow prevention assembly has a unitary housing with a passage therethrough, two threaded regions formed in an inner surface of the unitary housing, and two valve assemblies positioned in the passage to prevent fluid flow in a direction. Each valve assembly has an annular mount having a threaded outer surface that engages one of the threaded regions on the inner surface of the housing. The threads can be formed by placing a die having a thread on an outer surface thereof in contact with an inner surface of the unitary housing, and pressing on the outer surface of the housing.
Claims5
A method of forming a backflow prevention assembly, comprising:
- providing a unitary housing having a wall defining a passage therethrough;
- placing a first die having a thread on an outer surface therefore in contact with an inner surface of the unitary housing;
- pressing on the outside of the housing to drive the inner surface of the housing against the thread on the outer surface of the first die to form a thread on the inner surface of the housing;
- and
- attaching a valve assembly to the housing by threadably engaging a thread on the valve assembly with the thread on the inner surface of the housing.
Dependencies are inferred from the claim text.