US4238290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nuclear reactor installation
Assignee: Kraftwerk Union AG
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Filing: 1978-01-16
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Granted: 1980-12-09
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Expires: 1998-01-16
Abstract
Abstract In a nuclear reactor installation, a steam generator's live-steam line leading through the containment, is equipped with a fast-acting shut-off valve, to shut off the steam in the event of a line break. If the steam pressure rises in the generator, the valve acts as a safety valve and releases a small amount of steam, so that there is no danger of damage to the steam generator. The invention is of interest particularly for light-water reactors, e.g., pressurized-water reactors.
Inventors
- 👤 Hans-Peter Schabert
- 👤 Jorgen Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:23
CPC Classifications
G; G21; G21D; G21D3/00; G21D3/04; G21D3/06; F; F16; F16K; F16K1/00; F16K1/32; F16K1/52; F16K1/523; F16K17/00; F16K17/02; F16K17/168; F16K31/00; F16K31/12; F16K31/122; G21C; G21C9/00; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
212 words
A controllable valve for the live steam line extending from the inside to the outside of the containment of a nuclear reactor plant comprising: (a) a valve body having an inlet, an outlet and a valve seat, each with a cross section corresponding to that of the live steam line; (b) probe means in the live steam line for detecting the pressure therein in order to detect a leak in said steam line; (c) a movable valve disk disposed within said valve body; (d) operating means coupled to said probe means and responsive thereto for moving the valve disk to a closed position in the event of a leak in the live steam line, said operating means being further responsive to the application of the pressure on the valve disk in excess of the normal operating pressure of the live steam line to move the valve toward an open position; and (e) limiting means for limiting the reopening of the valve in response to said excessive pressure to a maximum of one half the outlet cross section, whereby after closing, in response to a leak in the live steam line, said valve will reopen to prevent a build-up of pressure on its inlet side to prevent damage to the nuclear reactor plant.
Claim 2
Dependent Claim
212 words
A controllable valve for the live steam line extending from the inside to the outside of the containment of a nuclear reactor plant comprising: (a) a valve body having an inlet, an outlet and a valve seat, each with a cross section corresponding to that of the live steam line; (b) probe means in the live steam line for detecting the pressure therein in order to detect a leak in said steam line; (c) a movable valve disk disposed within said valve body; (d) operating means coupled to said probe means and responsive thereto for moving the valve disk to a closed position in the event of a leak in the live steam line, said operating means being further responsive to the application of the pressure on the valve disk in excess of the normal operating pressure of the live steam line to move the valve toward an open position; and (e) limiting means for limiting the reopening of the valve in response to said excessive pressure to a maximum of one half the outlet cross section, whereby after closing, in response to a leak in the live steam line, said valve will reopen to prevent a build-up of pressure on its inlet side to prevent damage to the nuclear reactor plant.
Claim 3
Dependent Claim
41 words
The valve of claim 1 in which the disk has retard means for holding it from opening for more than about 30% of said aperture cross section under the force of said excessive pressure, at least for a short time interval.
Claim 4
Dependent Claim
12 words
The valve of claim 2 in which said retard means is adjustable.
Claim 5
Dependent Claim
34 words
The valve of claim 3 in which the valve disk has an operating stem and the said retard means comprises an adjustable mechanical stop for the stem and powered means for adjusting the stop.
Claim 6
Dependent Claim
36 words
The valve of claim 1 in which said operating means is for sequentially partially closing and thereafter fully closing the valve disk on the valve seat, under said force which is overcome by said excessive pressure.
Claim 7
Dependent Claim
30 words
The valve of claim 5 in which said partial closing leaves the valve with a residual aperture cross section of from 5% to 20% of said maximum aperture cross section.
Claim 8
Dependent Claim
12 words
The valve of claim 5 in which said partial closing is adjustable.
Claim 9
Dependent Claim
33 words
The valve of claim 1 in which said valve disk and valve seat have conical surfaces differently angled to form an annular Venturi when the valve disk is partially closed on the seat.
Claim 10
Dependent Claim
14 words
The valve of claim 1 in which the fast-acting valve is inside said containment.
Claim 11
Dependent Claim
19 words
The valve of claim 1 in which said operating means has a statically stored energy source controllably connected thereto.
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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) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |