Patent US3869671A successfully refreshed from Google Patents.
Patent US3736640A successfully refreshed from Google Patents.
US3736640A
Expired / Lapsed
US
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Method of forming a metal valve seat
Assignee: FMC Corp
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Filing: 1970-12-15
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Granted: 1973-06-05
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Expires: 1990-12-15
Abstract
Abstract A metal valve seat and method of forming the same which includes providing an annulus having a thick annular body and a thin neck defining a sealing end of the body. After the annulus has been mounted in the valve body, a ball is placed on the neck and an impact force is applied to the ball thereby deforming the neck and forming an annular concave sealing surface which conforms to the contacted curvature of the ball.
Inventors
- 👤 F Freiheit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:37
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/20; B21K1/24; B21J; B21J15/00; B21J15/38; B21J15/50; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49409
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A method of forming a metal valve seat for a ball valve comprising the steps of forming an annulus having a seating end and a sealing end, reducing the thickness of the annulus at the sealing end, placing a metal ball against the inner surface of the annulus at the sealing end, and applying a force to the ball normally of the plane of said sealing end sufficient to deform the reduced thickness portion of the annulus to provide a sealing surface conforming in shape to that of the contacted surface of the ball.
Claim 2
Independent Claim
94 words
A method of forming a metal valve seat for a ball valve comprising the steps of forming an annulus having a seating end and a sealing end, reducing the thickness of the annulus at the sealing end, placing a metal ball against the inner surface of the annulus at the sealing end, and applying a force to the ball normally of the plane of said sealing end sufficient to deform the reduced thickness portion of the annulus to provide a sealing surface conforming in shape to that of the contacted surface of the ball.
Claim 3
Dependent Claim
34 words
A method according to claim 1 and additionally comprising the step of mounting the seating end of the annulus in fluid tight relation with a valve body prior to deforming the seating end thereof.
Claim 4
Dependent Claim
19 words
A method according to claim 2 wherein the mounting of the annulus is performed by a press fitting operation.
Claim 5
Dependent Claim
28 words
A method according to claim 1 wherein the deforming force applied to the ball is an impact force which partially bends and partially cold forges the sealing surface.
Claim 6
Dependent Claim
28 words
A method according to claim 1 wherein the thickness of the sealing end is reduced by reducing the outside diameter of the annulus of the sealing end thereof.
Claim 7
Dependent Claim
35 words
A method according to claim 2 wherein the reduction in the diameter provides an annular neck adjacent the sealing end of the annulus which is approximately one-half as thick as the body of the annulus.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |