Patent US3575197A successfully refreshed from Google Patents.
US3575197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve leak detector
Assignee: TDK Micronas GmbH
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Filing: 1969-06-27
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Granted: 1971-04-20
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Expires: 1989-06-27
Abstract
Abstract The invention includes, for example, a special main line gas shutoff valve for the main burner of a gas furnace. The valve has two seats. Means are then provided to detect gas leakage into the space between seats. Preferably, a pressure switch is actuated to prevent main burner ignition if a gas leak is detected.
Inventors
- 👤 William A Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:27
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/28; G01M3/2876; F; F16; F16K; F16K25/00; F17; F17D; F17D5/00; F17D5/02; F23; F23N; F23N5/00; F23N5/24; F23N5/247; F16L; F16L2101/00; F16L2101/30; F23N2231/00; F23N2231/18; Y; Y10; Y10T; Y10T137/00; Y10T137/5762; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
In fluid flow apparatus, the combination comprising: a control to admit and to shut off fluid flow, said control including a valve body having an iNlet and an outlet, a valve in said body having two seats, said seats being constructed in a manner such that when said valve is closed, fluid must pass between said valve and each of said seats in succession in order to escape from said inlet into said outlet, said seats being spaced apart to provide a cavity therebetween when said valve is closed; first means providing a passage between said cavity and said outlet; second means providing a constriction in said passage, said first means including a first portion between said cavity and said constriction, said first means including a second portion between said constriction and said outlet; and third means in communication with said first portion actuable when the pressure therein exceeds a predetermined magnitude.
Claim 2
Dependent Claim
152 words
In fluid flow apparatus, the combination comprising: a control to admit and to shut off fluid flow, said control including a valve body having an iNlet and an outlet, a valve in said body having two seats, said seats being constructed in a manner such that when said valve is closed, fluid must pass between said valve and each of said seats in succession in order to escape from said inlet into said outlet, said seats being spaced apart to provide a cavity therebetween when said valve is closed; first means providing a passage between said cavity and said outlet; second means providing a constriction in said passage, said first means including a first portion between said cavity and said constriction, said first means including a second portion between said constriction and said outlet; and third means in communication with said first portion actuable when the pressure therein exceeds a predetermined magnitude.
Claim 3
Dependent Claim
15 words
The invention as defined in claim 1, wherein said third means includes a pressure switch.
Claim 4
Dependent Claim
87 words
The invention as defined in claim 1, wherein said third means includes a housing; a diaphragm dividing said housing into inner and outer chambers, said housing having a passage in communication between said first portion and said inner chamber; a first pivoted arm positioned to be moved by said diaphragm; a second pivoted arm positioned to be moved by said first arm, a normally closed switch, said second arm being positioned to actuate said switch; and a spring to bias said second arm away from said switch.
Claim 5
Dependent Claim
23 words
The invention as defined in claim 1, wherein said valve includes a resilient disc, said seats being in the shape of concentric rings.
Claim 6
Dependent Claim
22 words
The invention as defined in claim 4, wherein said inner ring is positioned slightly closer to said disc than said outer ring.
Claim 7
Dependent Claim
25 words
The invention as defined in claim 1, wherein said valve is a gate valve, said seats being concentric rings on one side of said valve.
Claim 8
Dependent Claim
41 words
The invention as defined in claim 1, wherein said third means includes a switch, a diaphragm responsive to pressure in said first portion for actuating said switch, and a diaphragm responsive to pressure in said second portion for actuating said switch.
Claim 9
Dependent Claim
99 words
The invention as defined in claim 1, wherein said valve includes a resilient disc, said valve body including an annular partition having one annular seat for engagement with said disc, the other seat being spaced axially away from said one seat and said disc, said other seat being a cylindrical surface having an inside diameter less than that of said one seat, said valve also including a piston fixed relative to said disc to slide continuously inside said other seat, said piston having an external annular groove, and an O-ring in said groove for engagement with said other seat.
Claim 10
Dependent Claim
44 words
The invention as defined in claim 1, wherein said valve is a gate valve, one of said seats being a ring to engage one side of said valve, the other of said seats being a ring to engage the other side of said valve.
Claim 11
Dependent Claim
44 words
The invention as defined in claim 1, wherein said valve is a ball valve, one of said seats being a ring to engage one side of said valve, the other of said seats being a ring to engage the other side of said 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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |