Patent US3761055A successfully refreshed from Google Patents.
US3761055A
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Freeze seal for sodium valves
Assignee: Okano Valve Mfg Co Ltd
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Filing: 1971-11-08
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Granted: 1973-09-25
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Expires: 1991-11-08
Abstract
Abstract A freeze seal for a valve having an elongated stuffing box and a longitudinally movable valve stem extending through the box. A plurality of metallic packings separated by metallic rings are disposed in the box around the valve stem to maintain sodium in the frozen state within the box. Each packing is formed of nickel, nickel base alloy, austenitic stainless steel, aluminum or aluminum base alloy in the form of a thin wire, wool, thin sheet, foil or combinations thereof. It can include two coaxial layers of metallic wool, a metallic foil interposed between them and an outer sheath made of a braid of thin metallic wire.
Inventors
- 👤 S Ebuchi
- 👤 T Kazama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:07
CPC Classifications
F; F16; F16K; F16K49/00; F16J; F16J15/00; F16J15/16; F16J15/40; F16J15/403; F16K41/00; F16K41/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
177 words
A rod packing device for freeze sealing a valve stem of a valve structure for liquid sodium, comprising in combination, a valve body, a finned hollow cylindrical member disposed on said valve bOdy, a valve stem movably extending through both said valve body and said hollow cylindrical member to define with the inner surface of said cylindrical member an annular cylindrical space within said hollow cylindrical member around that portion thereof disposed in the latter, and a plurality of packings and a plurality of metallic rings disposed in alternating relationship within said annular cylindrical space of said cylindrical member and around said valve stem, each of said packings being a metallic material selected from the group consisting of nickel, nickel base alloys, austenitic stainless steels, aluminum and aluminum base alloys and being in the form of a selected one of thin wire, wool, thin sheet, foil and combinations thereof, whereby when liquid sodium is admitted to said annular cylindrical space during use of the valve structure, it solidifies and seals the stem in the hollow cylindrical member.
Claim 2
Dependent Claim
177 words
A rod packing device for freeze sealing a valve stem of a valve structure for liquid sodium, comprising in combination, a valve body, a finned hollow cylindrical member disposed on said valve bOdy, a valve stem movably extending through both said valve body and said hollow cylindrical member to define with the inner surface of said cylindrical member an annular cylindrical space within said hollow cylindrical member around that portion thereof disposed in the latter, and a plurality of packings and a plurality of metallic rings disposed in alternating relationship within said annular cylindrical space of said cylindrical member and around said valve stem, each of said packings being a metallic material selected from the group consisting of nickel, nickel base alloys, austenitic stainless steels, aluminum and aluminum base alloys and being in the form of a selected one of thin wire, wool, thin sheet, foil and combinations thereof, whereby when liquid sodium is admitted to said annular cylindrical space during use of the valve structure, it solidifies and seals the stem in the hollow cylindrical member.
Claim 3
Dependent Claim
54 words
A rod packing device as claimed in claim 1, wherein each of said packings has a central annular core of metallic wool and an annular covering layer of metallic wool thereover, a metallic foil interposed between said layers, and an outer sheath of a braid of thin metallic wire covering said metallic wool layers.
Claim 4
Dependent Claim
30 words
A rod packing device as claimed in claim 2, wherein each of said packings comprises a plurality of thin metallic sheet and alternating layers of metallic wool in stacked relationship.
References Cited (Backward Citations)
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |