US3709255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure valves
Assignee: Auto Anti-Pollution Devices of Canada Ltd
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Filing: 1971-02-12
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Granted: 1973-01-09
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Expires: 1991-02-12
Abstract
Abstract The present safety valve is installable in the mouth of a pressurized fluid container from which the fluid exits through an inlet, outlet and connecting passageway in the valve casing. A plug is provided in the passageway to close and completely seal it when a significant imbalance occurs between the fluid pressures in the valve inlet and the valve outlet respectively. The plug is then restorable to open position only by first closing and then reopening the safety valve, after which the plug will continue to remain in its open position subject to the precedent correction and subsequent absence of the pressure imbalance.
Inventors
- 👤 A Ciotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:08
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/30; F16K1/301; F16K1/303; F16K17/00; F16K17/20; F16K17/22; F17; F17C; F17C13/00; F17C13/04; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0323; F17C2205/0329; F17C2205/0332; F17C2205/0382; F17C2205/0388; F17C2205/0391; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7726; Y10T137/7727; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7938; Y10T137/8593; Y10T137/87917; Y10T137/88046
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
285 words
A safety valve installable in a pressurizable container comprising: a valve casing; a fluid inlet in said casing; a fluid outlet in said casing; a passageway communicating therebetween; a valve seat intermediately disposed in said passageway accommodating fluid flow therethrough from said inlet to said outlet; a valve element encaged in said passageway and disposed between said valve seat and said inlet and movable therein between a seated position on said valve seat in which it blocks all such fluid flow, and an unseated neutral location; a probe movable through said valve seat to engage and unseat said valve element; a valve stem manipulable externally of the said casing to move the probe to engage and unseat the said valve element as aforesaid and thereafter to effect release of said valve element, and a spring biasing said valve element towards its unseated neutral position; the said valve element being dimensioned to restrict said passageway to induce a drop in fluid pressure therein between its upstream and its downstream sides with said drop increasing and decreasing proportionately to increases and decreases in fluid flow; the valve element being movable to the seated position aforementioned when the pressure on its upstream side materially overrides the pressure on its downstream side, and The bias of said spring being insufficient to withstand such materially overriding pressures; a secondary closure for said fluid outlet co-operable with said probe to effect closing and re-opening of said outlet when the probe is manipulated as aforesaid; the said secondary closure effecting progressive closing of said outlet while the probe is being moved to engage and unseat said valve element and effecting progressive re-opening of said outlet with the release of said valve element.
Claim 2
Dependent Claim
285 words
A safety valve installable in a pressurizable container comprising: a valve casing; a fluid inlet in said casing; a fluid outlet in said casing; a passageway communicating therebetween; a valve seat intermediately disposed in said passageway accommodating fluid flow therethrough from said inlet to said outlet; a valve element encaged in said passageway and disposed between said valve seat and said inlet and movable therein between a seated position on said valve seat in which it blocks all such fluid flow, and an unseated neutral location; a probe movable through said valve seat to engage and unseat said valve element; a valve stem manipulable externally of the said casing to move the probe to engage and unseat the said valve element as aforesaid and thereafter to effect release of said valve element, and a spring biasing said valve element towards its unseated neutral position; the said valve element being dimensioned to restrict said passageway to induce a drop in fluid pressure therein between its upstream and its downstream sides with said drop increasing and decreasing proportionately to increases and decreases in fluid flow; the valve element being movable to the seated position aforementioned when the pressure on its upstream side materially overrides the pressure on its downstream side, and The bias of said spring being insufficient to withstand such materially overriding pressures; a secondary closure for said fluid outlet co-operable with said probe to effect closing and re-opening of said outlet when the probe is manipulated as aforesaid; the said secondary closure effecting progressive closing of said outlet while the probe is being moved to engage and unseat said valve element and effecting progressive re-opening of said outlet with the release of said valve element.
Claim 3
Dependent Claim
34 words
A safety valve in accordance with claim 1 wherein: the parts are arranged to procure final closing and initial re-opening of said outlet substantially simultaneously with the engagement and release of said valve element.
Claim 4
Dependent Claim
31 words
A safety valve in accordance with claim 1 wherein: the probe is attached to said stem and forms an integrated unit therewith and said closure is carried by said integrated unit.
Claim 5
Dependent Claim
167 words
A safety valve in accordance with claim 1 wherein: the said valve element is a hollow elongated body closed at one end and seatable upon said valve seat the passageway between the inlet and the valve seat being shaped conformingly to said valve element to constitute a bearing therefor to retain it in functional orientation within the passageway; said valve element also including an external radial flange serving as an abutment for said spring; a retainer installed in the casing inlet completing engagement of said valve element in said passageway; the valve stem and said probe forming an integrated unit carrying said secondary closure, and the facilities for installing said safety valve include means on the exterior of said casing co-operable with corresponding means on said container, the means on the valve casing being located at a level which will dispose the portion thereof between the fluid inlet and the valve seat, at least, within the interior of the container when the safety valve is installed therein.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |