US3700246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A sealing device for introduction of a vertical rotary shaft through an upper wall of a container or pipe
Assignee: KAELLE REGULATORER AB
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Filing: 1971-02-16
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Granted: 1972-10-24
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Expires: 1991-02-16
Abstract
Abstract A sealing device for introduction of a vertical rotary shaft through an opening in an upper wall of a container or pipe filled with liquid under pressure, the purpose being to prevent the liquid from contact with a packing box supporting the shaft above said wall. A vessel surrounding a shaft portion below the packing box has a bottom opening coinciding with the opening in said upper wall and dimensioned to receive the shaft with clearance. The upper part of the vessel communicates with a source of pressurized gas through a throttle valve, and a diaphragm inserted in the bottom wall of the vessel is adapted to cause the valve to open for supply of gas when liquid from the underlying container rises above a predetermined level in the vessel.
Inventors
- 👤 Knut Enarsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:59
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
206 words
A device for sealing around a vertical, rotary shaft extended through an opening in an upper wall of a container filled with liquid under pressure for preventing liquid contact with a shaft supporting, packing box spaced above said upper wall, comprising a substantially closed vessel surrounding a shaft portion between said packing box and said upper wall dimensioned to receive said shaft with clearance permitting said liquid to rise into the lower end of said vessel, control means including a throttle valve for connecting the upper end of said vessel with a source of pressurized gas to balance and control the level of liquid therein above said opening, diaphragm means in a bottom wall of said vessel for opening said throttle valve to supply gas when said liquid from said container rises above a predetermined level in said vessel, a closed fluid chamber in communication with said diaphragm means including a wall portion comprising a second diaphragm, a gas chamber in communication with said upper portion of said vessel and said second diaphragm, said throttle valve positioned to control the input of gas to said gas chamber from said source of pressurized gas, and linkage means interconnecting said throttle valve for actuation by said second diaphragm.
Claim 2
Independent Claim
206 words
A device for sealing around a vertical, rotary shaft extended through an opening in an upper wall of a container filled with liquid under pressure for preventing liquid contact with a shaft supporting, packing box spaced above said upper wall, comprising a substantially closed vessel surrounding a shaft portion between said packing box and said upper wall dimensioned to receive said shaft with clearance permitting said liquid to rise into the lower end of said vessel, control means including a throttle valve for connecting the upper end of said vessel with a source of pressurized gas to balance and control the level of liquid therein above said opening, diaphragm means in a bottom wall of said vessel for opening said throttle valve to supply gas when said liquid from said container rises above a predetermined level in said vessel, a closed fluid chamber in communication with said diaphragm means including a wall portion comprising a second diaphragm, a gas chamber in communication with said upper portion of said vessel and said second diaphragm, said throttle valve positioned to control the input of gas to said gas chamber from said source of pressurized gas, and linkage means interconnecting said throttle valve for actuation by said second diaphragm.
Claim 3
Dependent Claim
33 words
The sealing device of claim 1, wherein said linkage means includes an adjustable resilient member mounted to subject said second diaphragm to a predetermined bias against the fluid in said closed fluid chamber.
Claim 4
Dependent Claim
28 words
The sealing device of claim 1 including vent means in said upper portion of said vessel for relieving excessive gas pressure therein from leakage of said throttle 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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |