Patent US4976106A successfully refreshed from Google Patents.
US4976106A
Expired / Lapsed
US
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Load-sensing variable displacement pump controller with adjustable pressure-compensated flow control valve in feedback path
Assignee: Linde GmbH
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Filing: 1989-02-13
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Granted: 1990-12-11
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Expires: 2009-02-13
Abstract
Abstract A hydraulic switching system has an adjustable delivery volume pump connected to a pump regulating unit that is controlled by a load-sensing regulator. The load-sensing regulator is connected to a control pressure line that carries the maximum hydraulic energy consumer pressure required by at least one hydraulic energy consumer. The hydraulic energy consumer connected to the pump is controlled by a multiway valve having a given adjustment path. In order to increase the fine-controllability of the hydraulic energy consumer when desired, a pressure-compensated flow control valve which is located in the control pressure line is switched in and out of the system.
Inventors
- 👤 Juergen Noerskau
- 👤 Georg Klingenbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:12
CPC Classifications
F; F15; F15B; F15B7/00; F15B7/02; E; E02; E02F; E02F9/00; E02F9/20; E02F9/22; E02F9/2278; E02F9/2296; E02F9/2221; E02F9/2232; F15B11/00; F15B11/02; F15B11/04; F15B11/05; F15B11/055; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20553; F15B2211/25; F15B2211/253; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/6055
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
In a hydraulic switching system having a hydraulic pump with an adjustable delivery volume, at least one hydraulic energy consumer, a multiway valve connected to said hydraulic energy consumer, a pump regulating unit loaded with pump outlet pressure, a load-sensing regulator connected to said pump regulating unit and a control pressure line connected to said multiway valve to be loaded with pressure by said hydraulic energy consumer, the improvement comprising pressure-compensated flow control valve means operatively connected in said control pressure line between said multiway valve and said load-sensing regulator.
Claim 2
Dependent Claim
90 words
In a hydraulic switching system having a hydraulic pump with an adjustable delivery volume, at least one hydraulic energy consumer, a multiway valve connected to said hydraulic energy consumer, a pump regulating unit loaded with pump outlet pressure, a load-sensing regulator connected to said pump regulating unit and a control pressure line connected to said multiway valve to be loaded with pressure by said hydraulic energy consumer, the improvement comprising pressure-compensated flow control valve means operatively connected in said control pressure line between said multiway valve and said load-sensing regulator.
Claim 3
Dependent Claim
47 words
The hydraulic switching system set forth in claim 1, wherein said pressure-compensated flow control valve means is an adjustable pressure-compensated flow control valve with bypass wherein said flow control valve is adjusted by a mechanical adjusting mechanism to activate and deactivate said pressure-compensated flow control valve means.
Claim 4
Dependent Claim
46 words
The hydraulic switching system set forth in claim 1, wherein said pressure-compensated flow control valve means is a pressure-compensated flow control valve with bypass wherein said flow control valve is adjusted by an electrical adjusting means to activate and deactivate said pressure-compensated flow control valve means.
Claim 5
Dependent Claim
28 words
The hydraulic switching system set forth in claim 3, wherein said electrical adjusting means is a magnet and a potentiometer connected to said magnet to control said magnet.
Claim 6
Dependent Claim
19 words
The hydraulic switching system set forth in claim 3, wherein said electrical adjusting means is an electrically controlled valve.
Claim 7
Dependent Claim
44 words
The hydraulic switching system set forth in claim 1, wherein said pressure-compensated flow control valve means is a pressure-compensated flow control valve with bypass which is a valve that can be switched in or out of said system by an electrically controlled blocking valve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |