US3749121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relief valve apparatus
Assignee: Individual
•
Filing: 1971-05-11
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Granted: 1973-07-31
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Expires: 1991-05-11
Abstract
Abstract A tamper proof safety relief valve having both a basic relief valve and a safety relief valve capability incorporated therein. The relief valve is adapted to open a valve port when a predetermined pressure is applied thereagainst and a tamper proof safety relief element is adapted to open a valve port through said relief valve when a predetermined pressure is reached. If the basic relief valve fails to operate, the safety relief element will come into operation at a pressure just beyond the operating pressure of the basic relief valve.
Inventors
- 👤 P Frankewich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:03
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/0433; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7841
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
285 words
A relief valve apparatus comprising: a. a casing having an inlet and an outlet with a passageway therebetween; b. a first valve gate positioned in said passageway, said first valve gate having a removable spring holding member; c. a first coil spring biasing said first valve gate, one end of said spring engaging said removable spring holding member whereby said first valve gate is adapted to open upon a first predetermined pressure being applied through said inlet against said first valve gate; d. an adjustment member engaging said spring and threaded through an opening in said casing so as to facilitate adjustments to the compression of said first coil spring and thereby select said first predetermined pressure; e. a second valve gate positioned within said first valve gate; f. a second coil spring positioned within said first valve gate for biasing said second valve gate, whereby said second valve gate is adapted to open an alternate passageway between said inlet and said outlet and through said first valve gate upon a second predetermined pressure greater than said first predetermined pressure being applied through said inlet and against said second valve gate; g. a second valve gate adjustment cap disposed within said first valve gate and underneath said removable spring holding member, with one end of said second coil spring biased against said adjustment cap so as to facilitate adjustment to the compression of said second coil spring and thereby select said second predetermined pressure; and wherein h. said casing and said first valve gate are closed such that access to such second valve gate adjustment cap is had only by removal of said engaging member, said first coil spring anD said removable spring holding member.
Claim 2
Dependent Claim
285 words
A relief valve apparatus comprising: a. a casing having an inlet and an outlet with a passageway therebetween; b. a first valve gate positioned in said passageway, said first valve gate having a removable spring holding member; c. a first coil spring biasing said first valve gate, one end of said spring engaging said removable spring holding member whereby said first valve gate is adapted to open upon a first predetermined pressure being applied through said inlet against said first valve gate; d. an adjustment member engaging said spring and threaded through an opening in said casing so as to facilitate adjustments to the compression of said first coil spring and thereby select said first predetermined pressure; e. a second valve gate positioned within said first valve gate; f. a second coil spring positioned within said first valve gate for biasing said second valve gate, whereby said second valve gate is adapted to open an alternate passageway between said inlet and said outlet and through said first valve gate upon a second predetermined pressure greater than said first predetermined pressure being applied through said inlet and against said second valve gate; g. a second valve gate adjustment cap disposed within said first valve gate and underneath said removable spring holding member, with one end of said second coil spring biased against said adjustment cap so as to facilitate adjustment to the compression of said second coil spring and thereby select said second predetermined pressure; and wherein h. said casing and said first valve gate are closed such that access to such second valve gate adjustment cap is had only by removal of said engaging member, said first coil spring anD said removable spring holding member.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |