US3845785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spring biased safety valve
Assignee: Dover Corp
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Filing: 1973-05-10
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Granted: 1974-11-05
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Expires: 1993-05-10
Abstract
Abstract A biased safety valve for preventing the flow of materials therethrough in the presence of predetermined conditions is disclosed. Resilient means urges an outlet closure member upstream away from the outlet. When the predetermined conditions have been met, the closure member overcomes the resistance of the resilient means and is seated against the outlet to prevent further flow therethrough.
Inventors
- 👤 J Mcmath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:34
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/04; F16K15/044; F16K17/00; F16K17/20; F16K17/22; F16K17/24; F16K17/28; F16K17/30; F16K17/36; F16K17/38; F16K17/383; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7869
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
264 words
A safety valve normally biased in the open condition in the absence of a predetermined pressure differential conditiOn and operational to a closed condition in response to the predetermined condition, the valve comprising in combination: a housing having an inlet and an outlet and a bore therethrough connecting the inlet and outlet, a guide mounted in said bore, said guide having parallel arms extending downstream from said inlet to define a raceway and being connected at one end by an end plate in substantially U-shaped manner, said raceway having an open end downstream of said inlet, said end plate having an aperture therethrough and being aligned with said inlet, a closure ball mounted for axial movement along said raceway, ball engaging shoulders projecting from said parallel arms adjacent the end plate to prevent said ball from obstructing the end plate aperture in the open condition, a valve seat surface formed upstream of said outlet and in close proximity to the open end of said guide, said valve seat surface receiving said closure ball in sealing engagement in the valve closed condition to stop flow therethrough, a spring axially mounted in said bore between said ball and said outlet, said spring acting against said ball to urge said ball upstream along said raceway and out of engagement with said valve seat surface in the open condition wherein flow occurs therethrough and whereby said ball is urged downstream to overcome the force of said spring and engage said valve seat surface in response to a predetermined pressure differential condition occurring between said inlet and said outlet.
Claim 2
Dependent Claim
264 words
A safety valve normally biased in the open condition in the absence of a predetermined pressure differential conditiOn and operational to a closed condition in response to the predetermined condition, the valve comprising in combination: a housing having an inlet and an outlet and a bore therethrough connecting the inlet and outlet, a guide mounted in said bore, said guide having parallel arms extending downstream from said inlet to define a raceway and being connected at one end by an end plate in substantially U-shaped manner, said raceway having an open end downstream of said inlet, said end plate having an aperture therethrough and being aligned with said inlet, a closure ball mounted for axial movement along said raceway, ball engaging shoulders projecting from said parallel arms adjacent the end plate to prevent said ball from obstructing the end plate aperture in the open condition, a valve seat surface formed upstream of said outlet and in close proximity to the open end of said guide, said valve seat surface receiving said closure ball in sealing engagement in the valve closed condition to stop flow therethrough, a spring axially mounted in said bore between said ball and said outlet, said spring acting against said ball to urge said ball upstream along said raceway and out of engagement with said valve seat surface in the open condition wherein flow occurs therethrough and whereby said ball is urged downstream to overcome the force of said spring and engage said valve seat surface in response to a predetermined pressure differential condition occurring between said inlet and said outlet.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |