Patent US4533195A successfully refreshed from Google Patents.
Patent US3820561A successfully refreshed from Google Patents.
US3820561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-return valve assembly
Assignee: Individual
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Filing: 1973-05-23
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Granted: 1974-06-28
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Expires: 1993-05-23
Abstract
Abstract A valve assembly particularly for use in piston compressors wherein a valve opening is covered by a pair of superposed platelike closure members. The closure member closer to the valve seat has an aperture and the closure members have stroke limiting stops at different distances from the valve seat so that when the member closer to the seat has reached its maximum opening, the other member can still open further to uncover said aperture.
Inventors
- 👤 J Papst
- 👤 S Papst
- 👤 B Brockmuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:28
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/10; F04B39/1073; F16; F16K; F16K15/00; F16K15/02; F16K15/08; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7841; Y10T137/7879
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
202 words
A valve assembly comprising a valve seat having at least one flow passage therein, first and second closure members mounted in superposed relation on said valve seat and covering said flow passage, said first closure member lying on said valve seat and having an opening therein overlying said passage, said second closure member overlying said first closure member, a first stroke limitation stop means for said first closure member located at a first distance from said valve seat, a second stroke limitation stop means for said second closure member located at a second distance from said valve seat, said second distance being greater than said first distance plus the thickness of said second closure member, said second closure member being so mounted as to be resiliently biased toward said valve seat whereby, during an initial opening of the valve, said closure members together move away from said valve seat until said first closure member abuts against said first stop means which limits the maximum opening of said first closure member to uncover said opening, said second closure member moving farther away from said valve seat until it abuts against said second stop means to uncover said opening of said first closure member.
Claim 2
Dependent Claim
202 words
A valve assembly comprising a valve seat having at least one flow passage therein, first and second closure members mounted in superposed relation on said valve seat and covering said flow passage, said first closure member lying on said valve seat and having an opening therein overlying said passage, said second closure member overlying said first closure member, a first stroke limitation stop means for said first closure member located at a first distance from said valve seat, a second stroke limitation stop means for said second closure member located at a second distance from said valve seat, said second distance being greater than said first distance plus the thickness of said second closure member, said second closure member being so mounted as to be resiliently biased toward said valve seat whereby, during an initial opening of the valve, said closure members together move away from said valve seat until said first closure member abuts against said first stop means which limits the maximum opening of said first closure member to uncover said opening, said second closure member moving farther away from said valve seat until it abuts against said second stop means to uncover said opening of said first closure member.
Claim 3
Dependent Claim
40 words
The valve assembly according to claim 1 wherein said first stop means comprises spaced stops located adjacent the periphery of said first closure member, said spaced stops defining passages therebetween for flow of the medium when the valve is open.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |