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US4070001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum safety valve
Assignee: Individual
•
Filing: 1976-07-06
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Granted: 1978-01-24
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Expires: 1996-07-06
Abstract
Abstract A vacuum safety valve comprises a closed cylindrical valve body having one end connected to a system to be evacuated, and a tube extending from the side wall to a vacuum pumping system. The other end of the valve body includes a port connected to ambient air through a solenoid operated valve which is normally open when de-energized. An extendable bellows is secured about the port on the inside of the valve body, and the distal end of the bellows is sealed by a plate having a small bleed hole in the edge thereof. Should the pumping system fail, the solenoid valve is deactuated to open the bellows interior to ambient air. The air pressure expands the bellows and drives the plate against the interior port to seal off the system side of the valve before the vacuum therein is destroyed.
Inventors
- 👤 Ronald R. Musgrove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:42
CPC Classifications
F; F16; F16K; F16K51/00; F16K51/02; Y; Y10; Y10S; Y10S137/00; Y10S137/907
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A vacuum safety valve, comprising a valve body having an inlet port and an outlet port, valve seating means disposed about said inlet port on the interior of said valve body, extendable bellows secured within said valve body and including means for engaging said seating means and sealing said inlet port when said bellows means is fully extended; said valve body including a bellows port communicating with the interior of said extendable bellows and with a valve means which selectively opens to ambient air, said means for engaging said seating means including a plate secured in sealing fashion to the distal free end of said bellows, and further including a bleed port extending from said interior of said bellows through said plate to the peripheral edge thereof, said bleed port extending in constant, limited flow communication between said interior of said valve body and said interior of said bellows.
Claim 2
Dependent Claim
149 words
A vacuum safety valve, comprising a valve body having an inlet port and an outlet port, valve seating means disposed about said inlet port on the interior of said valve body, extendable bellows secured within said valve body and including means for engaging said seating means and sealing said inlet port when said bellows means is fully extended; said valve body including a bellows port communicating with the interior of said extendable bellows and with a valve means which selectively opens to ambient air, said means for engaging said seating means including a plate secured in sealing fashion to the distal free end of said bellows, and further including a bleed port extending from said interior of said bellows through said plate to the peripheral edge thereof, said bleed port extending in constant, limited flow communication between said interior of said valve body and said interior of said bellows.
Claim 3
Dependent Claim
19 words
The safety valve of claim 1, wherein said seating means includes an O-ring seal disposed about said inlet port.
Claim 4
Dependent Claim
36 words
The safety valve of claim 1, wherein said valve body comprises a cylinder having said inlet port at one end thereof, and said extendable bellows is secured to the interior surface of the other end thereof.
Claim 5
Dependent Claim
19 words
The safety valve of claim 3, wherein said bellows port is disposed in said other end of said cylinder.
Claim 6
Dependent Claim
18 words
The safety valve of claim 4, wherein said outlet port is disposed in the wall of said cylinder.
Claim 7
Dependent Claim
34 words
The safety valve of claim 1, wherein said valve means is closed when actuated, and said extendable bellows is extended only by positive pressure therein introduced through said valve means when deactuated and open.
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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |