US3603333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure relief valve
Assignee: Carrier Corp
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Filing: 1969-08-29
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Granted: 1971-09-07
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Expires: 1989-08-29
Abstract
Abstract The complete blowdown-type relief valve disclosed is intended especially for use in low-pressure systems. The valve employs a shearpin mechanism for holding the valve closed. A spring is interposed between the valve and the shearpin mechanism and serves, prior to the shearing of the pin, to yieldingly force the valve into sealing engagement with the valve seat. This arrangement prevents fluttering movement or chattering of the valve and variable forces on the shearpin, due to fluctuations in the pressure against the valve.
Inventors
- 👤 Carl M Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:33
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/44; F16K31/56; F16K17/00; F16K17/02; F16K17/14; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1782
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
A pressure relief valve comprising a body formed with inlet and outlet ports; a valve seat located intermediate said ports; a flow passage extending through said seat from said inlet port to said outlet port; a valve movable axially into and out of operative relation with said seat for closing and opening said passage; valve-restraining means carried by said body and operable to restrain movement of said valve from said seat, said valve-restraining means including a shearpin, said shearpin being shearable upon application of pressure of predetermined value at said inlet port for movement of said valve from said seat, said valve-restraining means also including a spring disposed intermediate said valve and shearpin and operable, prior to the shearing of said pin, to exert a yielding force on said pin and on said valve to maintain the same in sealing engagement with said seat, said valve-restraining means being also provided with an adjusting screw operable to vary the value of said yielding force.
Claim 2
Dependent Claim
163 words
A pressure relief valve comprising a body formed with inlet and outlet ports; a valve seat located intermediate said ports; a flow passage extending through said seat from said inlet port to said outlet port; a valve movable axially into and out of operative relation with said seat for closing and opening said passage; valve-restraining means carried by said body and operable to restrain movement of said valve from said seat, said valve-restraining means including a shearpin, said shearpin being shearable upon application of pressure of predetermined value at said inlet port for movement of said valve from said seat, said valve-restraining means also including a spring disposed intermediate said valve and shearpin and operable, prior to the shearing of said pin, to exert a yielding force on said pin and on said valve to maintain the same in sealing engagement with said seat, said valve-restraining means being also provided with an adjusting screw operable to vary the value of said yielding force.
Claim 3
Dependent Claim
145 words
A pressure relief valve comprising a body formed with inlet and outlet ports; a valve seat located intermediate said ports; a flow passage extending through said seat from said inlet port to said outlet port; a valve movable axially into and out of engagement with said seat for closing and opening said passage, a bracket fixed to said body; a lever pivotally mounted on said bracket; a shearpin engaging said lever and bracket for restraining pivotal movement of said lever; an adjusting screw carried by said lever; force-transmitting means including a spring interposed between said screw and said valve and operable to exert a yielding sealing engagement between said valve and seat, said shearpin being shearable upon application of pressure of predetermined value against said valve at said inlet port to permit pivotal movement of said lever and movement of said valve from said seat.
Claim 4
Dependent Claim
145 words
A pressure relief valve comprising a body formed with inlet and outlet ports; a valve seat located intermediate said ports; a flow passage extending through said seat from said inlet port to said outlet port; a valve movable axially into and out of engagement with said seat for closing and opening said passage, a bracket fixed to said body; a lever pivotally mounted on said bracket; a shearpin engaging said lever and bracket for restraining pivotal movement of said lever; an adjusting screw carried by said lever; force-transmitting means including a spring interposed between said screw and said valve and operable to exert a yielding sealing engagement between said valve and seat, said shearpin being shearable upon application of pressure of predetermined value against said valve at said inlet port to permit pivotal movement of said lever and movement of said valve from said seat.
Claim 5
Dependent Claim
34 words
A pressure relief valve as set forth in claim 2 including a stem extending from said valve toward said lever and said spring interposed between the end of said stem and said adjusting screw.
Claim 6
Dependent Claim
32 words
A pressure relief valve as set forth in claim 2 including a stem extending from said valve to said screw and a helical compression spring interposed between said stem and said valve.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |