Patent US3656500A successfully refreshed from Google Patents.
US3656500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: Dresser Rand Co
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Filing: 1970-05-18
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Granted: 1972-04-18
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Expires: 1990-05-18
Abstract
Abstract A check valve having a generally cylindrical valve chamber with a valve seat surface at one radial wall of the chamber and spring recesses at the opposite radial wall of the chamber. An annular plate seats against the valve seat surface and coil springs in the recesses bear against the annular plate valve to bias it to closed position. Teflon sleeve members in the spring recesses contain the springs and have notched ends which straddle the annular plate and thus locate it centrally of the valve structure. The notches have a depth to permit opening and closing movement of the plate and the sleeves are self-lubricating with respect to the plate edges, the springs disposed within the sleeve, and cylindrical members between the coil springs and the plate and slidable in the sleeves.
Inventors
- 👤 Thomas E Mayer Sr
- 👤 George Yokota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:53
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/08; Y; Y10; Y10T; Y10T137/00; Y10T137/5109; Y10T137/5283; Y10T137/7722; Y10T137/7837; Y10T137/7859; Y10T137/7861; Y10T137/7862
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
167 words
A check valve comprising a housing having a chamber therein including a flat surface having a plurality of circumferentially arranged fluid pressure ports opening therethrough, an annular valve plate adapted to seat against said surface and thereby close said ports, and outlet pressure passage from said chamber, and means for biasing said valve plate toward said surface and for maintaining said valve plate in concentricity with respect to said pressure ports, said means comprising a plurality of circumferentially spaced recesses in said housing at the side of said chamber opposite to said flat surface, and sleeve members in said recesses and extending substantially to said surface, said sleeve members being held against axial movement between said surface and the bottom of said recesses and having notches in their projecting ends whereby said ends engage edge portions of said annular valve plate to retain the same against radial displacement, and coil springs in said sleeve members acting against said valve plate to urge the same toward said surface.
Claim 2
Dependent Claim
167 words
A check valve comprising a housing having a chamber therein including a flat surface having a plurality of circumferentially arranged fluid pressure ports opening therethrough, an annular valve plate adapted to seat against said surface and thereby close said ports, and outlet pressure passage from said chamber, and means for biasing said valve plate toward said surface and for maintaining said valve plate in concentricity with respect to said pressure ports, said means comprising a plurality of circumferentially spaced recesses in said housing at the side of said chamber opposite to said flat surface, and sleeve members in said recesses and extending substantially to said surface, said sleeve members being held against axial movement between said surface and the bottom of said recesses and having notches in their projecting ends whereby said ends engage edge portions of said annular valve plate to retain the same against radial displacement, and coil springs in said sleeve members acting against said valve plate to urge the same toward said surface.
Claim 3
Dependent Claim
28 words
A check valve according to claim 1 wherein the depth of said notches is such as to permit free movement of said valve plate away from said surface.
Claim 4
Dependent Claim
15 words
A check valve according to claim 1 wherein said sleeve members are of lubricative material.
Claim 5
Dependent Claim
15 words
A check valve according to claim 2 wherein said sleeve members are of lubricative material.
Claim 6
Dependent Claim
24 words
A check valve according to claim 1 including cylindrical members between said coil springs and said valve plate and slidable in said sleeve members.
Claim 7
Dependent Claim
19 words
A check valve according to claim 1 wherein the notched ends of said sleeve members straddle said valve plate.
Claim 8
Dependent Claim
51 words
A valve assembly according to claim 1 wherein said housing comprises a pair of complemental housing members, an annular member disposed marginally between said housing members and a central member likewise disposed between said housing members, and means retaining said housing members in clamping engagement with said annular and central members.
Claim 9
Dependent Claim
17 words
A valve assembly according to claim 7 wherein said complemental housing members are coaxial generally cylindrical members.
Claim 10
Dependent Claim
26 words
A valve assembly according to claim 7 wherein said annular and central members are interchangeable as to thickness to provide various degrees of valve plate movement.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |