Patent US3820568A successfully refreshed from Google Patents.
US3820568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide valve for hydraulic pressure systems
Assignee: Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
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Filing: 1972-10-20
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Granted: 1974-06-28
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Expires: 1992-10-20
Abstract
Abstract A slide valve for the control of high pressure hydraulic systems is provided which can be manufactured in a compact form for savings of space and production costs by virtue of having a pressure inlet port connected with first and second inlet apertures which are angularly offset in substantially the same cross-sectional plane of a valve housing having a longitudinally slidable valve member therein, with the first inlet aperture communicating through a transverse duct in the valve member with an exhaust (outlet) port of the housing when the valve member is in a neutral position, and the valve member having communication ducts formed therealong, advantageously as flat regions at opposite sides thereof interconnected by bores extending transversely therethrough at right angles to the aforesaid transverse duct, by which the second inlet aperture is connected with at least one pressure output or service port in the housing when the valve member is in a service position.
Inventors
- 👤 R Brunner
- 👤 S Zenker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:00
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/86702; Y10T137/87169; Y10T137/87177; Y10T137/87185
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
207 words
Control valve of longitudinal slide valve type for the control of hydraulic consumers, having a pressureless circulation arrangement passing centrally through the bore which houses the valve member in the neutral position of the control valve via a first inlet aperture connected with a pump connection and via an outlet aperture, also having at least one consumer connection offset in the longitudinal direction of the valve member bore with which connection there is associated a second inlet aperture connected to said pump connection, and also having at least one communication duct provided in the valve member for connecting the consumer connection with the second inlet aperture and with a transverse communication duct adapted to be brought into operation in the opposite sense by displacement of the valve member, for connecting the first inlet aperture with the outlet aperture of the pressureless circulation arrangement, characterised in that both the first and the second inlet apertures are arranged in angularly offset manner in a narrowly limited arial region of the valve member, and that the transverse communication duct is constructed as a radial through-bore in the valve member, which in the neutral position of the control valve is in alignment with the first inlet aperture and the outlet aperture.
Claim 2
Dependent Claim
207 words
Control valve of longitudinal slide valve type for the control of hydraulic consumers, having a pressureless circulation arrangement passing centrally through the bore which houses the valve member in the neutral position of the control valve via a first inlet aperture connected with a pump connection and via an outlet aperture, also having at least one consumer connection offset in the longitudinal direction of the valve member bore with which connection there is associated a second inlet aperture connected to said pump connection, and also having at least one communication duct provided in the valve member for connecting the consumer connection with the second inlet aperture and with a transverse communication duct adapted to be brought into operation in the opposite sense by displacement of the valve member, for connecting the first inlet aperture with the outlet aperture of the pressureless circulation arrangement, characterised in that both the first and the second inlet apertures are arranged in angularly offset manner in a narrowly limited arial region of the valve member, and that the transverse communication duct is constructed as a radial through-bore in the valve member, which in the neutral position of the control valve is in alignment with the first inlet aperture and the outlet aperture.
Claim 3
Dependent Claim
28 words
Control valve according to claim 1, characterised in that the transverse communication duct and the communication duct are arranged in the same cross-sectional Plane of the valve member.
Claim 4
Dependent Claim
27 words
Control valve according to claim 1, characterised in that the transverse communication duct and the communication duct extend substantially at right angles to one another without intersecting.
Claim 5
Dependent Claim
29 words
Control valve according to claim 1, characterised in that between the second inlet aperture and the inlet duct coming from the pump connection there is arranged a non-return valve.
Claim 6
Dependent Claim
37 words
Control valve according to claim 1, characterised in that the communication ducts - as viewed in radial section - are situated at opposite sides of the valve member and are connected to one another by communication bores.
Claim 7
Dependent Claim
27 words
Control valve according to claim 1, characterised in that the communication ducts comprise shallow recesses provided in the valve member in the region of the communication bores.
Claim 8
Dependent Claim
92 words
Control valve having at least one slide valve member according to claim 1, characterised in that in one and the same cross-sectional plane of at least one valve member there are provided side by side two parallel bores of which one bore forms the transverse communication duct and the other bore provides a communication between the inlet duct and the return connection via a duct in the valve housing, the flow of the pressure medium in said other bore being directed oppositely to the direction of flow through the transverse communication duct.
Claim 9
Dependent Claim
70 words
Control valve having a plurality of slide valve members according to claim 1, characterised in that the particular second inlet aperture leading to the valve members branches off in parallel manner from the inlet duct, and that the valve members are so arranged in the housing that the first inlet apertures, the outlet apertures and the transverse communication ducts of all the control valves are in alignment with one another.
Claim 10
Dependent Claim
23 words
Control valve according to claim 1, wherein there are two of said consumer connections and said axial region lies between said consumer connections.
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 |