Patent US4013093A successfully refreshed from Google Patents.
US4013093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic valves
Assignee: Massey Ferguson Services NV
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Filing: 1975-11-14
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Granted: 1977-03-22
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Expires: 1995-11-14
Abstract
Abstract A valve which may operate as either a check valve or a relief valve includes a chamber which is connected to a first hydraulic conduit by a restricted passage. A relief valve vents the chamber at a predetermined pressure to unbalance the valve member and allow fluid to flow from the first conduit to a second. The valve member is made with a telescoping portion to allow reverse flow when the first conduit is at a lower pressure than the second.
Inventors
- 👤 Carlo Pensa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:29
CPC Classifications
F; F16; F16H; F16H39/00; F16H39/02; G; G05; G05D; G05D16/00; G05D16/04; G05D16/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7766; Y10T137/7771
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
A valve comprising a body, wall means defining a first and second conduit in said body, a valve member operable to control flow of fluid between said conduits and movable between a first position wherein said conduits are hydraulically disconnected and a second position wherein said conduits are hydraulically connected, a first element on said valve member, surface means on said element to react with fluid pressure in said conduits to bias said valve member toward said second position, a second element on said valve member and resilient biasing means operative to urge apart said first and second elements, stop means for limiting relative movement between said first and second elements, wall means defining a chamber, a restrictive passage between said first conduit and said chamber, fluid pressure in said chamber biasing said valve member toward said first position, and relief valve means operable to allow fluid to flow from said chamber upon attainment of a predetermined pressure therein.
Claim 2
Dependent Claim
159 words
A valve comprising a body, wall means defining a first and second conduit in said body, a valve member operable to control flow of fluid between said conduits and movable between a first position wherein said conduits are hydraulically disconnected and a second position wherein said conduits are hydraulically connected, a first element on said valve member, surface means on said element to react with fluid pressure in said conduits to bias said valve member toward said second position, a second element on said valve member and resilient biasing means operative to urge apart said first and second elements, stop means for limiting relative movement between said first and second elements, wall means defining a chamber, a restrictive passage between said first conduit and said chamber, fluid pressure in said chamber biasing said valve member toward said first position, and relief valve means operable to allow fluid to flow from said chamber upon attainment of a predetermined pressure therein.
Claim 3
Dependent Claim
15 words
The valve of claim 1 wherein said restrictive passage is formed within said valve member.
Claim 4
Dependent Claim
20 words
A valve according to claim 1 wherein a resilient member acts to bias said valve member toward said first position.
Claim 5
Dependent Claim
18 words
A valve according to claim 1 wherein said chamber is formed between said valve member and said body.
Claim 6
Dependent Claim
20 words
A valve according to claim 4 wherein said relief valve is housed within said body and communicates with said chamber.
Claim 7
Dependent Claim
23 words
A valve according to claim 4 wherein a spring is located in said chamber and acts between said body and said valve member.
Claim 8
Dependent Claim
18 words
A valve according to claim 1 wherein a passage hydraulically connects said relief valve and said second conduit.
Claim 9
Dependent Claim
24 words
A valve according to claim 1 wherein said second element is biased against a seat to seal said first conduit from said second conduit.
Claim 10
Dependent Claim
20 words
A valve according to claim 1 wherein said second element presents a surface to hydraulic fluid in said first conduit.
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |