Patent US3604453A successfully refreshed from Google Patents.
US3604453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: Vetco Gray LLC
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Filing: 1969-10-24
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Granted: 1971-09-14
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Expires: 1989-10-24
Abstract
Abstract A radially directed annular shoulder in the housing through passageway seats a flapper having opposed trunnions nearer one edge. The trunnions are received in a circumferential groove which is axially longer than the thickness of the trunnions to allow movement of the trunnions away from the seat. A spring received in the groove mounts the flapper; another urges the trunnions toward the seat and presses the flapper toward the seat. The flapper is thus free to move angularly of the housing to even out seat wear. The cross-sectional area of the housing passageway at the immediately downstream of the flapper trunnions remains circular, but is larger in area to accommodate the fluid flow plus the volume of the flapper when the valve is open. As flow is directed against the flapper from the upstream side, the second spring compresses and the flapper moves off the seat. At the same time, the flow tends to rotate the flapper about the axis of the trunnions which are acting against the springs. When fully open, only a small portion of the edge of the flapper is exposed to the flowing media; hence, a low pressure drop is experienced.
Inventors
- 👤 Boyd Boitnott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:23
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/033; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7898
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
255 words
A valve including: a housing having a longitudinal through passageway, said passageway having means defining a chamber therein intermediate the ends thereof, said chamber being delimited at one end by a radially directed annular shoulder defining a circumferential valve seat; a valve disk having two aligned trunnions thereon laterally offset from a diameter of the disk; recess means defined in said housing adjacent said seat downstream thereof, said recess means including a circumferential groove opening into said through passageway, said groove being longer axially of the through passageway then the diameter of said trunnions are thick; said trunnions being received in said groove; torsion spring means mounted in said housing, said torsion spring means including at least one leg disposed to bear against said disk in such sense as to urge said disk toward said seat, at least another leg disposed against said housing, and a curved portion intermediate said one leg and said other leg; a retainer resiliently, removably received in said groove proceeding the long way around therein between the outer ends of said trunnions and having opposite ends thereof maintaining the outer ends of said trunnions in bottoming relationship in said groove; means between said retainer ring and torsion spring for maintaining said torsion spring other leg in position to bear against said housing; said torsion spring means resiliently pressing said disk against said seat, whereby upstream fluid flowing against said disk moves said disk downstream and rotates said disk about said trunnions against restoring force provided by said torsion spring means.
Claim 2
Dependent Claim
255 words
A valve including: a housing having a longitudinal through passageway, said passageway having means defining a chamber therein intermediate the ends thereof, said chamber being delimited at one end by a radially directed annular shoulder defining a circumferential valve seat; a valve disk having two aligned trunnions thereon laterally offset from a diameter of the disk; recess means defined in said housing adjacent said seat downstream thereof, said recess means including a circumferential groove opening into said through passageway, said groove being longer axially of the through passageway then the diameter of said trunnions are thick; said trunnions being received in said groove; torsion spring means mounted in said housing, said torsion spring means including at least one leg disposed to bear against said disk in such sense as to urge said disk toward said seat, at least another leg disposed against said housing, and a curved portion intermediate said one leg and said other leg; a retainer resiliently, removably received in said groove proceeding the long way around therein between the outer ends of said trunnions and having opposite ends thereof maintaining the outer ends of said trunnions in bottoming relationship in said groove; means between said retainer ring and torsion spring for maintaining said torsion spring other leg in position to bear against said housing; said torsion spring means resiliently pressing said disk against said seat, whereby upstream fluid flowing against said disk moves said disk downstream and rotates said disk about said trunnions against restoring force provided by said torsion spring means.
Claim 3
Dependent Claim
17 words
The valve of claim 1 wherein said retainer is a coil spring under compression in said groove.
Claim 4
Dependent Claim
13 words
The valve of claim 1 wherein said retainer is a C-shaped snap ring.
Claim 5
Dependent Claim
55 words
The valve of claim 1 wherein said trunnions both have means defining axially directed openings therein; and wherein said force transmitting means comprises a rod received in said openings and extending between said trunnions; said torsion spring curved portion being at least one spring coil; said rod extending through said at least one spring coil.
Claim 6
Dependent Claim
22 words
The valve of claim 4 wherein said torsion spring other leg is received in said groove for gaining purchase against said housing.
Claim 7
Dependent Claim
32 words
The valve of claim 1 wherein said trunnions, from outer end to outer end, extend over a length about equal to a diameter of said housing through passageway adjacent said groove therein.
Claim 8
Dependent Claim
21 words
The valve of claim 1 including bearing means of antifriction material interposed between each end of the retainer and each trunnion.
Claim 9
Dependent Claim
78 words
The valve of claim 1 further including means defining a stop boss on the downstream face of said valve disk; and means defining a circumferential recess in said housing through passageway downstream of said groove, located for receipt of said valve disk upon opening thereof regardless of orientation of the valve disk, angularly with respect to the longitudinal axis of the body; said stop boss being arranged to bottom in said recess for limiting opening of said valve.
Claim 10
Dependent Claim
281 words
A valve including: a housing having a longitudinal through passageway, said passageway having means defining a chamber therein intermediate the ends thereof, said chamber being delimited at one end by a radially directed annular shoulder defining a circumferential valve seat; a valve disk having two aligned trunnions thereon laterally offset from a diameter of the disk; recess means defined in said housing adjacent said seat downstream thereof, said recess means including a circumferential groove opening into said through passageway, said groove being longer axially of the through passageway than the diameter of said trunnions is thick; said trunnions being received in said groove; said trunnions, from outer end to outer end, extendIng over a length about equal to a diameter of said housing through passageway adjacent said groove; torsion spring means mounted in said housing, said torsion spring means including at least one leg disposed to bear against said disk in such sense as to urge said disk toward said seat, at least another leg disposed against said housing, and a curved portion intermediate said one leg and said other leg; retainer means, removably received in said groove proceeding the long way around therein between the outer ends of said trunnions and having opposite ends thereof engaging the outer ends of said trunnions to maintain them in said groove; rod means received through the curved portion of the torsion spring for transmitting retaining force for maintaining the torsion spring other leg in position to bear against said housing; said torsion spring means resiliently pressing said disk against said seat, whereby upstream fluid flowing against said disk rotates said disk about said trunnions against restoring force provided by said torsion spring means.
Claim 11
Dependent Claim
281 words
A valve including: a housing having a longitudinal through passageway, said passageway having means defining a chamber therein intermediate the ends thereof, said chamber being delimited at one end by a radially directed annular shoulder defining a circumferential valve seat; a valve disk having two aligned trunnions thereon laterally offset from a diameter of the disk; recess means defined in said housing adjacent said seat downstream thereof, said recess means including a circumferential groove opening into said through passageway, said groove being longer axially of the through passageway than the diameter of said trunnions is thick; said trunnions being received in said groove; said trunnions, from outer end to outer end, extendIng over a length about equal to a diameter of said housing through passageway adjacent said groove; torsion spring means mounted in said housing, said torsion spring means including at least one leg disposed to bear against said disk in such sense as to urge said disk toward said seat, at least another leg disposed against said housing, and a curved portion intermediate said one leg and said other leg; retainer means, removably received in said groove proceeding the long way around therein between the outer ends of said trunnions and having opposite ends thereof engaging the outer ends of said trunnions to maintain them in said groove; rod means received through the curved portion of the torsion spring for transmitting retaining force for maintaining the torsion spring other leg in position to bear against said housing; said torsion spring means resiliently pressing said disk against said seat, whereby upstream fluid flowing against said disk rotates said disk about said trunnions against restoring force provided by said torsion spring means.
References Cited (Backward Citations)
US3016914A
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 |