US4976106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 15:53
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.
References Cited (Backward Citations)
US3856436A
Cited
US3987626A
Cited
US4132072A
Cited
US4087968A
Cited
US4199942A
Cited
US4355510A
Cited
JPS57154501A
Cited
JPS57154502A
Cited
US4523430A
Cited
JPS57167501A
Cited
US4665699A
Cited
US4553904A
Cited
US4617798A
Cited
US4617854A
Cited
US4745747A
Cited
DE3629638A1
Cited
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 |