Backflow prevention assembly
AssigneeWatts Investment Company
InventorLester Engelmann
Life of this patent
Estimating the term…
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.
Claims16
A backflow prevention assembly, comprising:
- a unitary housing having a wall defining a passage therethrough;
- two threaded regions formed in an inner surface of the unitary housing by reshaping the wall of the unitary housing;
- and
- two valve assemblies positioned in the passage to prevent fluid flow in a direction, each valve assembly having an annular mount having a threaded outer surface that engages one of the threaded regions on the inner surface of the housing.
A backflow prevention assembly, comprising:
- a unitary housing having a passage therethrough;
- two threaded regions formed directly in an inner surface of the housing by placing a die having a thread on an outer surface thereof in contact with the inner surface of the housing and pressing on the outside of the housing to drive the inner surface against the threads on the outer surface of the die;
- and
- two valve assemblies positioned in the passage to prevent fluid flow in a direction, each valve assembly having an annular mount having a threaded outer surface that engages one of the threaded regions on the inner surface of the housing.
A backflow prevention assembly, comprising:
- a unitary housing having 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 having an annular mount having a threaded outer surface that engages one of the threaded regions on the inner surface of the housing.
A backflow prevention assembly, comprising:
- a housing having a passage therethrough;
- two threaded regions formed in an inner surface of the unitary housing by reshaping the wall of the unitary housing;
- and
- two valve assemblies positioned in the passage to prevent fluid flow in a direction, each valve assembly having an annular mount having a threaded outer surface that engages one of the threaded regions on the inner surface of the housing.
A method of forming threads in a tubular housing, comprising:
- placing a first die having a thread on an outer surface thereof in contact with an inner surface of a unitary housing having a passage therethrough;
- and
- pressing on the outside of the housing to drive the inner surface against the threads on the outer surface of the first die to form threads on the inner surface of the housing.
Dependencies are inferred from the claim text.