US3604682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seat assembly for rotary ball valves
Assignee: BC Richards and Co Pty Ltd
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Filing: 1970-05-13
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Granted: 1971-09-14
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Expires: 1990-05-13
Abstract
Abstract A seal assembly for a rotary ball valve having a sealing ring conically undercut on its rear face, and a backing ring mating with the undercut face as described in U.S. Pat. No. 3,387,815, includes a complementary interfitting circumferential ridge and recess on said mated surfaces.
Inventors
- 👤 Cecil G F Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:20
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/06; F16K5/0663; F16K5/0673
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
86 words
A sealing assembly for a rotary ball valve of the type including a sealing ring, its forward face shaped to seal against the ball and its rear face conically inclined inwards towards the ball, a backing ring of hard material with its forward face conical to mate with said rear face of said sealing ring, said backing ring being urged towards said sealing ring and said ball characterized in that the mating conical faces of said rings include a complementary interfitting circumferential ridge and recess therein.
Claim 2
Dependent Claim
86 words
A sealing assembly for a rotary ball valve of the type including a sealing ring, its forward face shaped to seal against the ball and its rear face conically inclined inwards towards the ball, a backing ring of hard material with its forward face conical to mate with said rear face of said sealing ring, said backing ring being urged towards said sealing ring and said ball characterized in that the mating conical faces of said rings include a complementary interfitting circumferential ridge and recess therein.
Claim 3
Dependent Claim
39 words
An assembly as claimed in claim 1, in which the interface of said mating surfaces is formed of a rear conical surface (furtherest from said ball), a front conical surface, and a step joining said front and rear surfaces.
Claim 4
Dependent Claim
40 words
An assembly as claimed in claim 2, in which said sealing ring includes a cylindrical surface extending from the front of said front conical surface towards said ball and forward extension of said backing ring supports said cylindrical surface internally.
References Cited (Backward Citations)
US3401914A
Cited
US3387815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |