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US3875963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swing check valve
Assignee: Valve Systems International Inc
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Filing: 1973-07-27
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Granted: 1975-04-08
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Expires: 1993-07-27
Abstract
Abstract The disclosure is of a swing check valve wherein the valve clapper is of a spherical section configuration with a conical sealing surface at its periphery cooperating with a complementary conical surface of a valve seat. The pivotal mounting for the valve may be manually operated to pivot the valve clapper to full open position or to free it to swing between open and closed position under fluid pressure.
Inventors
- 👤 Frank Eugene Buck
- 👤 Donald E Graham
- 👤 Larry A Battaglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:57
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/18; F16K15/182; F16K15/1821; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7898; Y10T137/7903; Y10T137/8158; Y10T137/8225; Y10T137/8275
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
226 words
A swing check valve comprising: a housing having upstream and downstream flow passageways therein; an annular valve seat in said housing surrounding said upstream flow passageway; a deeply dished, relatively thin spherical section valve clapper with an annular sealing surface around the concave side thereof; a relatively short arm secured to the convex side of said clapper adjacent the upper edge thereof, a pivot mounting on said housing located closely above said valve seat and closely adjacent the plane thereof supporting said arm for movement of said clapper between a closed position with said annular sealing surface engaging the outer surface of said valve seat, and an open position displaced therefrom; said clapper being sufficiently deeply dished that when in closed position its center of gravity is located well downstream of said pivot mounting to bias said clapper firmly against said valve seat by gravity without weights being carried thereon, despite the proximity of said pivot mounting to the plane of said valve seat; said annular sealing surface and said outer sealing surface being of complementary, conical configuration; and a chordal member of T-shape in crosssection secured across said concave side of the valve clapper in a direction transverse to the axis of said pivot mounting; the cross member of said chordal member presenting a camming surface to pigging devices moving through said upstream flow passageway.
Claim 2
Dependent Claim
226 words
A swing check valve comprising: a housing having upstream and downstream flow passageways therein; an annular valve seat in said housing surrounding said upstream flow passageway; a deeply dished, relatively thin spherical section valve clapper with an annular sealing surface around the concave side thereof; a relatively short arm secured to the convex side of said clapper adjacent the upper edge thereof, a pivot mounting on said housing located closely above said valve seat and closely adjacent the plane thereof supporting said arm for movement of said clapper between a closed position with said annular sealing surface engaging the outer surface of said valve seat, and an open position displaced therefrom; said clapper being sufficiently deeply dished that when in closed position its center of gravity is located well downstream of said pivot mounting to bias said clapper firmly against said valve seat by gravity without weights being carried thereon, despite the proximity of said pivot mounting to the plane of said valve seat; said annular sealing surface and said outer sealing surface being of complementary, conical configuration; and a chordal member of T-shape in crosssection secured across said concave side of the valve clapper in a direction transverse to the axis of said pivot mounting; the cross member of said chordal member presenting a camming surface to pigging devices moving through said upstream flow passageway.
Claim 3
Dependent Claim
27 words
The swing check valve defined by claim 1 wherein: said annular sealing surface is on a radius of the sphere of which said clapper is a section.
Claim 4
Dependent Claim
36 words
The swing check valve defined by claim 1 wherein: said camming surface extends diametrically from a point displaced from said sealing surface in the area adjacent said pivot mounting to a point adjacent said sealing surface.
Claim 5
Dependent Claim
104 words
The swing check valve defined by claim 1 wherein said pivot mounting comprises: a first shaft member rotatably carried on said housing and having an end portion thereof extending outside of said housing; means connected to said end portion for tuning said first shaft member; a second shaft member rotatably carried in said housing; means securing said valve clapper arm on said second shaft member; and a lost motion coupling between said first and second shaft members enabling said second shaft member to rotate freely in a valve opening direction, but transmitting valve opening rotation of said first shaft member to said shaft member.
Claim 6
Dependent Claim
36 words
The swing check defined by claim 4 including: an extension of said second shaft member extending outside of said housing; and indicator means on said extension to indicate the angular disposition of said second shaft member.
Claim 7
Dependent Claim
160 words
A swing check valve comprising: a housing having upstream and downstream flow passageways therein; an annular valve seat in said housing surrounding said upstream flow passageway; a first shaft member rotatably carried on said housing and having an end portion thereof extending outside of said housing; means connected to said end portion for turning said first shaft member; a second shaft member rotatably carried in said housing; a valve clapper secured on said second shaft member; a lost motion coupling between said first and second shaft members enabling said second shaft member to rotate freely in a valve opening direction, but transmitting valve opening rotation of said first shaft member to said second shaft member; an extension of said second shaft member extending outside of said housing; first indicator means on the end portion of said first shaft member for indicating the angular disposition thereof; and second indicator means on said second shaft extension for indicating the angular disposition thereof.
Claim 8
Dependent Claim
160 words
A swing check valve comprising: a housing having upstream and downstream flow passageways therein; an annular valve seat in said housing surrounding said upstream flow passageway; a first shaft member rotatably carried on said housing and having an end portion thereof extending outside of said housing; means connected to said end portion for turning said first shaft member; a second shaft member rotatably carried in said housing; a valve clapper secured on said second shaft member; a lost motion coupling between said first and second shaft members enabling said second shaft member to rotate freely in a valve opening direction, but transmitting valve opening rotation of said first shaft member to said second shaft member; an extension of said second shaft member extending outside of said housing; first indicator means on the end portion of said first shaft member for indicating the angular disposition thereof; and second indicator means on said second shaft extension for indicating the angular disposition thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |