Patent US4938376A successfully refreshed from Google Patents.
US4938376A
Expired / Lapsed
US
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Valve for safeguarding the outer container of double wall vacuum-insulated storage containers for low boiling liquified gases
Assignee: Messer Griesheim GmbH
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Filing: 1988-08-04
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Granted: 1990-07-03
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Expires: 2008-08-04
Abstract
Abstract A valve for safeguarding the outer container of a double wall vacuum-insulated container for low boiling liquified gases against a pressure increase in the insulation space after a loss of vacuum comprises a valve housing fastened in the outer container, a valve plug and an O-ring which, as a result of deformation, act as a sealing element between the valve housing and the valve plug. The dimensions of the valve housing and seal plug causing deformation of the O-ring in the radial direction and the influence of the outside air pressure causing simulataneous deformation in the axial direction.
Inventors
- 👤 Heinrich Fieseler
- 👤 Roland Henneborn
- 👤 Gunter Holstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:31
CPC Classifications
F; F17; F17C; F17C13/00; F17C13/12; F17C13/123; F16; F16J; F16J15/00; F16J15/02; F16J15/021; F16K; F16K17/00; F16K17/02; F16K17/12; F16K51/00; F16K51/02; F17C2203/00; F17C2203/03; F17C2203/0391; F17C2203/06; F17C2203/0602; F17C2203/0612; F17C2203/0626; F17C2203/0629; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0323; F17C2205/0332; Y; Y10; Y10S; Y10S251/00; Y10S251/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A method of safeguarding the outer container of double wall vacuum-insulated storage containers for low boiling liquified gases against a pressure increase in the insulation space after a loss of vacuum by means of a valve comprising a valve housing fastened in the outer container and a valve plug and an O-ring which as a result of deformation act as a sealing element between the valve housing and the valve plug, the improvement being in deforming the O-ring in its radial direction as a result of the dimensions of the valve housing and the seal plug and simultaneously deforming the O-ring in its axial direction as a result of the influence of the outside air pressure on the valve plug.
Claim 2
Independent Claim
120 words
A method of safeguarding the outer container of double wall vacuum-insulated storage containers for low boiling liquified gases against a pressure increase in the insulation space after a loss of vacuum by means of a valve comprising a valve housing fastened in the outer container and a valve plug and an O-ring which as a result of deformation act as a sealing element between the valve housing and the valve plug, the improvement being in deforming the O-ring in its radial direction as a result of the dimensions of the valve housing and the seal plug and simultaneously deforming the O-ring in its axial direction as a result of the influence of the outside air pressure on the valve plug.
Claim 3
Dependent Claim
27 words
The method of claim 1 characterized in deforming the O-ring from 5 to 10% in its radial direction and from 8 to 12% in its axial direction.
Claim 4
Dependent Claim
154 words
Valve to secure the outer tank of double-walled vacuum-insulated storage tanks for low-boiling liquefied gases against a rise in pressure in the insulation space if the vacuum is interrupted, by means of a valve housing attached in the outer tank, a valve plug arranged in the valve housing and forming an annular gap, and an O-ring provided as a sealing element in the annular gap, whose thickness, in order to achieve a deformation in the radial direction, is greater than the width of the annular gap, the improvement being in that the width of the annular gap which leads to a deformation of the O-ring in the radial direction of essentially less than 20%, as well as by means of circular sealing surfaces which engage with the O-ring and which are on the valve housing and valve plug, with which an axial deformation of the O-ring can be induced by the external air pressure.
Claim 5
Dependent Claim
154 words
Valve to secure the outer tank of double-walled vacuum-insulated storage tanks for low-boiling liquefied gases against a rise in pressure in the insulation space if the vacuum is interrupted, by means of a valve housing attached in the outer tank, a valve plug arranged in the valve housing and forming an annular gap, and an O-ring provided as a sealing element in the annular gap, whose thickness, in order to achieve a deformation in the radial direction, is greater than the width of the annular gap, the improvement being in that the width of the annular gap which leads to a deformation of the O-ring in the radial direction of essentially less than 20%, as well as by means of circular sealing surfaces which engage with the O-ring and which are on the valve housing and valve plug, with which an axial deformation of the O-ring can be induced by the external air pressure.
Claim 6
Dependent Claim
27 words
Valve according to claim 3, characterized by a width of the annular gap which leads to a radial deformation of the O-ring being between 5% and 10%.
Claim 7
Dependent Claim
34 words
Valve according to claim 4, characterized in that the dimensions and the material of the O-ring allow an axial deformation by the external air pressure after generation of the vacuum between 8% and 12%.
Claim 8
Dependent Claim
34 words
Valve according to claim 3, characterized in that the dimensions and the material of the O-ring allow an axial deformation by the external air pressure after generation of the vacuum between 8% and 12%.
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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) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |