US3735780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve
Assignee: Bosch Rexroth AG
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Filing: 1971-07-23
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Granted: 1973-05-29
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Expires: 1991-07-23
Abstract
Abstract A housing of a valve has an internal elongated chamber provided with a plurality of longitudinally arrayed discrete annular spaces including two longitudinally spaced terminal ones each of which communicate with a port. An elongated valve member is received in and longitudinally slidable in this chamber and provided with a plurality of spaced annular recesses in its outer circumferential surface. Each of these recesses is bounded by longitudinally spaced flow control edges. At least one annular groove is also provided axially adjacent at least one of the annular edges of each pair in the valve member.
Inventors
- 👤 W Heid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:14
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
111 words
A valve, particularly for hydraulic fluids, comprising a housing having an internal elongated chamber provided with a plurality of longitudinally arrayed discrete annular spaces including two longitudinally spaced terminal ones each of which communicates with a port; an elongated valve member received and longitudinally slidable in said chamber, said valve member having an outer circumferential surface provided with a plurality of spaced annular recesses each of which is bounded by a pair of longitudinally spaced annular edges; and at least one annular groove axially adjacent at least one of said annular edges of each pair and having a depth which corresponds at least substantially to the depth of said annular recesses.
Claim 2
Dependent Claim
111 words
A valve, particularly for hydraulic fluids, comprising a housing having an internal elongated chamber provided with a plurality of longitudinally arrayed discrete annular spaces including two longitudinally spaced terminal ones each of which communicates with a port; an elongated valve member received and longitudinally slidable in said chamber, said valve member having an outer circumferential surface provided with a plurality of spaced annular recesses each of which is bounded by a pair of longitudinally spaced annular edges; and at least one annular groove axially adjacent at least one of said annular edges of each pair and having a depth which corresponds at least substantially to the depth of said annular recesses.
Claim 3
Dependent Claim
120 words
A valve as defined in claim 1, wherein each of said grooves has two radial edge faces one of which is further from the associated annular recess than the other, and wherein said valve member is movable to and from a position in which each of said annular recesses bridges and connects into a composite space two consecutive ones of said annular spaces and in which said one radial edge face of the respective groove is substantially flush with an annular edge bounding the composite space. 3 A valve as defined in claim 1, wherein each of said grooves has an axial length corresponding at least substantially to the distance of the respective groove from the axially adjacent annular edge.
Claim 4
Dependent Claim
27 words
A valve as defined in claim 1, wherein said valve member is provided with ribs located between the respective grooves and the respectively axially adjacent annular edges.
Claim 5
Dependent Claim
17 words
A valve as defined in claim 4, wherein said ribs are annular ribs of hydrodynamically advantageous configuration.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |