US3828813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for load-independent flow regulation
Assignee: BERINGER HYDRAULIK BERINGER R and CO CH
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Filing: 1973-02-14
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Granted: 1974-08-13
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Expires: 1993-02-14
Abstract
Abstract A control apparatus for load-independent flow regulation, with at least one control unit having a slide valve, a pressure difference balance, conduits leading to a pump and to a consumer and a conduit communicating the pressure in the consumer unit to the pressure difference balance, is disclosed. This last conduit has first and second sections. The first section passes through the slide valve and, when the slide valve is moved out of the neutral position, opens into an annular groove provided in the slide valve bore. The second section extends from this annular groove and has located therein an operating piston which in one position connects a chamber of the pressure difference balance containing the pressure spring to this conduit and in the other position connects this chamber to a return conduit to a tank.
Inventors
- 👤 H Haussler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:09
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0416; F15B13/0417; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87177; Y10T137/87185
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
203 words
A control apparatus for lead-independent flow regulation, comprising at least one control unit having a housing with a bore and an annular groove communicating with said bore, and a slide valve in said bore movable to and from a neutral position, a first conduit connecting said slide valve to a pump, a second conduit connecting said slide valve to a consumer unit, a pressure difference balance for maintaining a constant, but adjustable pressure difference between said first conduit and the respectively connected second conduit, said pressure difference balance having a chamber, a pressure spring in said chamber, a third conduit for communicating the pressure in the second conduit to the pressure difference balance prior to connection of the latter to said first conduit, said third conduit having a first section which is located in said slide valve and which, when said slide valve is displaced from the neutral position, opens into said annular groove, and also having a second section which extends from said annular groove, an operating piston which is located in said second section and which in one position connects said chamber of said pressure difference balance to said third conduit and in another position connects said chamber to a reservoir.
Claim 2
Dependent Claim
203 words
A control apparatus for lead-independent flow regulation, comprising at least one control unit having a housing with a bore and an annular groove communicating with said bore, and a slide valve in said bore movable to and from a neutral position, a first conduit connecting said slide valve to a pump, a second conduit connecting said slide valve to a consumer unit, a pressure difference balance for maintaining a constant, but adjustable pressure difference between said first conduit and the respectively connected second conduit, said pressure difference balance having a chamber, a pressure spring in said chamber, a third conduit for communicating the pressure in the second conduit to the pressure difference balance prior to connection of the latter to said first conduit, said third conduit having a first section which is located in said slide valve and which, when said slide valve is displaced from the neutral position, opens into said annular groove, and also having a second section which extends from said annular groove, an operating piston which is located in said second section and which in one position connects said chamber of said pressure difference balance to said third conduit and in another position connects said chamber to a reservoir.
Claim 3
Dependent Claim
58 words
A control apparatus according to claim 1, wherein said first section of said third conduit comprises a first transverse bore connected to said second conduit, a longitudinal bore connected to said first transverse bore, and a second transverse bore penetrating said longitudinal bore, said second transverse bore opening into said annular groove upon actuation of said slide valve.
Claim 4
Dependent Claim
49 words
A control apparatus according to claim 1, wherein said second section comprises a bore, said operating piston being arranged to be movable in said last-mentioned bore, said last-mentioned bore having a first connecting channel leading to said pressure difference balance, and a second connecting channel leading to the reservoir.
Claim 5
Dependent Claim
51 words
A control apparatus according to claim 3, wherein said operating piston has two control flanges, one of said flanges adapted to block the connection between said second section and said first connecting channel, and the other flange being adapted to block the connection between said first connecting channel and the reservoir.
Claim 6
Dependent Claim
34 words
A control apparatus according to claim 3, including an abutment in said last-mentioned bore for limiting the movement of said operating piston, and an adjusting screw for axially adjusting the position of said abutment.
Claim 7
Dependent Claim
38 words
A control apparatus according to claim 4, said operating piston having edges spaced apart by a distance which is slightly greater than the diameter of said first connecting conduit between said last-mentioned bore and said pressure difference balance.
Claim 8
Dependent Claim
58 words
A control apparatus according to claim 1, wherein said second section comprises a third connecting channel extending at an angle from said annular groove and wherein said bore has a widening portion at each end, the diameter and depth of said widening portion being such that an extension of said third connecting channel lies inside said widening portion.
Claim 9
Dependent Claim
45 words
A control apparatus according to claim 5, wherein said operating piston has a transverse bore connected to said chamber, and a longitudinal bore connected to said transverse bore, said longitudinal bore terminating at that end face of said operating piston which is adjacent said abutment.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |