US3720220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety valve
Assignee: Dover Corp
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Filing: 1971-03-17
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Granted: 1973-03-13
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Expires: 1991-03-17
Abstract
Abstract A safety valve for preventing the flow of materials therethrough in the presence of a predetermined external temperature condition is disclosed. A fusible plug maintains a spring-biased closure member out of contact with a seat in the outlet path. Upon melting of the fusible material, the closure member is released and urged into contact with the seat in the outlet path to prevent any further flow of material therethrough.
Inventors
- 👤 Math J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:34
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/36; F16K17/38; F16K17/383; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T137/1819; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7927
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
185 words
A safety valve comprising a housing having an inlet and outlet and a bore therethrough connecting the inlet and outlet, a raceway removably mounted in the bore upstream of the outlet, a ball mounted for movement along said raceway, resilient means urging said ball downstream towards the outlet, a nut secured in said housing and extending into said housing bore, said nut engaging said raceway to retain the raceway in an axially aligned position in said bore, said nut being formed with a bore from one end to adjacent the other end, fusible plugs mounted in said nut bore at said other end, a pin slidingly mounted in said nut bore and engaging said fusible plugs at one end, the other end of said pin engaging said ball to restrict the downstream movement of said ball, said fusible plugs being meltable at predetermined temperatures wherein said pin is urged radially outward along said nut bore by the force of said resilient means acting on said ball whereby said ball closes the valve outlet when said pin has moved a sufficient distance along the nut bore.
Claim 2
Dependent Claim
185 words
A safety valve comprising a housing having an inlet and outlet and a bore therethrough connecting the inlet and outlet, a raceway removably mounted in the bore upstream of the outlet, a ball mounted for movement along said raceway, resilient means urging said ball downstream towards the outlet, a nut secured in said housing and extending into said housing bore, said nut engaging said raceway to retain the raceway in an axially aligned position in said bore, said nut being formed with a bore from one end to adjacent the other end, fusible plugs mounted in said nut bore at said other end, a pin slidingly mounted in said nut bore and engaging said fusible plugs at one end, the other end of said pin engaging said ball to restrict the downstream movement of said ball, said fusible plugs being meltable at predetermined temperatures wherein said pin is urged radially outward along said nut bore by the force of said resilient means acting on said ball whereby said ball closes the valve outlet when said pin has moved a sufficient distance along the nut bore.
Claim 3
Dependent Claim
185 words
A safety valve comprising a housing having an inlet and outlet and a bore therethrough connecting the inlet and outlet, a raceway removably mounted in the bore upstream of the outlet, a ball mounted for movement along said raceway, resilient means urging said ball downstream towards the outlet, a nut secured in said housing and extending into said housing bore, said nut engaging said raceway to retain the raceway in an axially aligned position in said bore, said nut being formed with a bore from one end to adjacent the other end, fusible plugs mounted in said nut bore at said other end, a pin slidingly mounted in said nut bore and engaging said fusible plugs at one end, the other end of said pin engaging said ball to restrict the downstream movement of said ball, said fusible plugs being meltable at predetermined temperatures wherein said pin is urged radially outward along said nut bore by the force of said resilient means acting on said ball whereby said ball closes the valve outlet when said pin has moved a sufficient distance along the nut bore.
Claim 4
Dependent Claim
185 words
A safety valve comprising a housing having an inlet and outlet and a bore therethrough connecting the inlet and outlet, a raceway removably mounted in the bore upstream of the outlet, a ball mounted for movement along said raceway, resilient means urging said ball downstream towards the outlet, a nut secured in said housing and extending into said housing bore, said nut engaging said raceway to retain the raceway in an axially aligned position in said bore, said nut being formed with a bore from one end to adjacent the other end, fusible plugs mounted in said nut bore at said other end, a pin slidingly mounted in said nut bore and engaging said fusible plugs at one end, the other end of said pin engaging said ball to restrict the downstream movement of said ball, said fusible plugs being meltable at predetermined temperatures wherein said pin is urged radially outward along said nut bore by the force of said resilient means acting on said ball whereby said ball closes the valve outlet when said pin has moved a sufficient distance along the nut bore.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |