Patent US4777979A successfully refreshed from Google Patents.
US4777979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Position detector for clapper of non-return valve
Assignee: Westinghouse Electric Corp
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Filing: 1987-11-16
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Granted: 1988-10-18
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Expires: 2007-11-16
Abstract
Abstract A non-return valve for a steam turbine steam line includes a housing and a clapper swingably mounted in the housing for angular movement between open and closed positions. A metal proximity detector is mounted on the interior surface of the cover for the valve access opening and adjacent the open position of the valve. Movement of the clapper away from its open position results in a signal providing an indication that the valve clapper is away from its open position.
Inventors
- 👤 Michael Twerdochlib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:02
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K37/00; F16K37/0025; F16K37/0041; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7898; Y10T137/7903; Y10T137/8158; Y10T137/8225; Y10T137/8242
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A steam turbine extraction line non-return valve, said valve comprising: a housing; a clapper swingably mounted in the housing for angular movement between open and closed positions; a metal proximity detector including electrically responsive means comprising at least one coil element mounted within the valve housing adjacent said open position of the clapper for providing a change in electrical signal whenever said clapper is not located at its said open position; and a ceramic housing mounted flush against an interior surface of the valve, said coil element being contained in said ceramic housing.
Claim 2
Dependent Claim
93 words
A steam turbine extraction line non-return valve, said valve comprising: a housing; a clapper swingably mounted in the housing for angular movement between open and closed positions; a metal proximity detector including electrically responsive means comprising at least one coil element mounted within the valve housing adjacent said open position of the clapper for providing a change in electrical signal whenever said clapper is not located at its said open position; and a ceramic housing mounted flush against an interior surface of the valve, said coil element being contained in said ceramic housing.
Claim 3
Dependent Claim
82 words
A steam turbine extraction line non-return valve, said valve comprising: a housing having an access opening; a cover for said opening; a clapper swingably mounted in the housing for angular movement between open and closed positions; and a metal proximity detector including electrically responsive means mounted within the housing on the interior surface of said cover and adjacent said open position of the clapper for providing a change in electrical signal whenever said clapper is not located at its said open position.
Claim 4
Dependent Claim
82 words
A steam turbine extraction line non-return valve, said valve comprising: a housing having an access opening; a cover for said opening; a clapper swingably mounted in the housing for angular movement between open and closed positions; and a metal proximity detector including electrically responsive means mounted within the housing on the interior surface of said cover and adjacent said open position of the clapper for providing a change in electrical signal whenever said clapper is not located at its said open position.
Claim 5
Dependent Claim
20 words
The invention of claim 2 wherein said electrically responsive means is generally circular and disposed to extend along said surface.
Claim 6
Dependent Claim
16 words
The invention of claim 2 wherein said electrically responsive means comprises at least one coil element.
Claim 7
Dependent Claim
21 words
The invention of claim 4 wherein said one element is confined in an annular ceramic housing mounted flush against said surface.
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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) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |