Patent US3827122A successfully refreshed from Google Patents.
US3827122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve cage apparatus and method of making same
Assignee: Dresser Industries Inc
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Filing: 1973-01-19
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Granted: 1974-08-06
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Expires: 1993-01-19
Abstract
Abstract A check valve cage is fabricated by injecting a reinforced thermal setting plastic through a channel extending along the central longitudinal axis of a cylindrical body. A form pin is inserted through a coaxial longitudinal bore at the other end of said cylindrical body, said bore having an increased diameter central portion for receiving the injected thermoplastic material. After the plastic material has set, lateral flow passages are formed in the wall of the cylindrical body. Shallow drilled holes within the central cavity of the body, upon being filled with the injected plastic material, prevent rotation of the plastic lining of the cage assembly.
Inventors
- 👤 B Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:25
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; F; F16; F16K; F16K25/00; F16K25/02; F16K27/00; F16K27/02; F16K27/0245; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/791; Y10T137/7911; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49412; Y10T29/49416; Y10T29/49417; Y10T29/4998
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A method for fabricating an internal plastic lining in the bore of a valve cage, comprising: forming a cylindrical, longitudinal bore within a valve cage housing, said bore having an end portion with diameter reduced from the diameter of the remainder of said bore; inserting a cylindrical mold pin into said bore a distance less than the length of said bore but greater than the length of said end portion of said bore, said pin having a diameter substantially equal to the diameter of said end portion of said bore; injecting a thermoplastic material into said bore around said mold pin; and, forming at least one fluid passageway through said housing and said plastic lining in communication with said bore.
Claim 2
Independent Claim
120 words
A method for fabricating an internal plastic lining in the bore of a valve cage, comprising: forming a cylindrical, longitudinal bore within a valve cage housing, said bore having an end portion with diameter reduced from the diameter of the remainder of said bore; inserting a cylindrical mold pin into said bore a distance less than the length of said bore but greater than the length of said end portion of said bore, said pin having a diameter substantially equal to the diameter of said end portion of said bore; injecting a thermoplastic material into said bore around said mold pin; and, forming at least one fluid passageway through said housing and said plastic lining in communication with said bore.
Claim 3
Independent Claim
222 words
A method of forming a cage-type valve assembly having a ball valve element, a valve seat, and a plastic cage liner therein, said method comprising: forming a cylindrical ball valve cavity within an unfinished valve cage housing member, said cavity passing partially through said housing member and having an open end and a solid end; forming in said valve cavity a cylindrical restricted bore passage comprising annular inner shoulder means in the open end of said valve cavity; forming an injection channel through said valve cage housing member intersecting said valve cavity away from said restricted bore passage; inserting a cylindrical member snugly into said restricted bore passage substantially sealing said bore passage and forming an annular space between said member and the sides of said valve cavity and forming an axial space between the end of said member and the solid end of said valve cavity; injecting molten thermoplastic material through said injection channel and filling said annular space and said axial space with said material; allowing said material to solidify and then removing said cylindrical member from said bore passage and valve cavity; machining openings through the wall of said cage housing member and said annular material, said openings communiCating with said valve cavity; and inserting a ball valve, cylindrical valve seat, and retaining means into said restricted bore passage.
Claim 4
Independent Claim
222 words
A method of forming a cage-type valve assembly having a ball valve element, a valve seat, and a plastic cage liner therein, said method comprising: forming a cylindrical ball valve cavity within an unfinished valve cage housing member, said cavity passing partially through said housing member and having an open end and a solid end; forming in said valve cavity a cylindrical restricted bore passage comprising annular inner shoulder means in the open end of said valve cavity; forming an injection channel through said valve cage housing member intersecting said valve cavity away from said restricted bore passage; inserting a cylindrical member snugly into said restricted bore passage substantially sealing said bore passage and forming an annular space between said member and the sides of said valve cavity and forming an axial space between the end of said member and the solid end of said valve cavity; injecting molten thermoplastic material through said injection channel and filling said annular space and said axial space with said material; allowing said material to solidify and then removing said cylindrical member from said bore passage and valve cavity; machining openings through the wall of said cage housing member and said annular material, said openings communiCating with said valve cavity; and inserting a ball valve, cylindrical valve seat, and retaining means into said restricted bore passage.
Claim 5
Dependent Claim
65 words
The method of claim 2 further comprising the step of forming locking means between said plastic cage liner and said housing member by drilling one or more holes in the internal wall of said housing member in said valve cavity area prior to inserting said cylindrical member into said bore passage, and allowing molten thermoplastic material to flow into said holes during said injecting step.
Claim 6
Dependent Claim
48 words
The method of claim 3 further comprising the step of forming additional locking means between said cage liner and said housing member by filling said injection channel with thermoplastic material during said injecting step and retaining at least a portion of said material therein after it has solidified.
Claim 7
Dependent Claim
59 words
The method of claim 4 further comprising prior to inserting said ball valve, valve seat, and retaining means into said restricted bore passage, the additional step of forming an enlarged counterbore partially along said restricted bore passage, said counterbore arranged to receive said valve seat and retaining means in abutting engagement with the remainder of said restricted bore passage.
References Cited (Backward Citations)
US297712A
Cited
US2464379A
Cited
US2591174A
Cited
US2524858A
Cited
US2682281A
Cited
US2937659A
Cited
US3451124A
Cited
US3591898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |