US5188337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control valve with pressure equalization
Assignee: Carl Freudenberg KG
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Filing: 1991-11-07
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Granted: 1993-02-23
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Expires: 2011-11-07
Abstract
Abstract A control valve for fluid media has an adjusting piston which is displaceable by a drive and whose face end can be seated against a valve seat. The adjusting piston and the drive are disposed in a valve housing which is completely filled with fluid. The adjusting piston is formed by a hollow body through which fluid can flow on both sides in the direction of its axis, and the hollow body surrounds a cavity. The cavity is sealed by a first sealing member extending transversely of its axis against the valve housing, and by a second sealing member which extends against a dividing wall which is contained in the cavity and is displaceable in a direction of the axis. The valve housing is filled on one side of the first and second sealing member facing away from the valve seat with an incompressible hydraulic protective fluid.
Inventors
- 👤 Klaus Mertens
- 👤 Andreas Sausner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:09
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/06; G05D16/063; G05D16/0644; G05D16/0672; G05D16/20; G05D16/2086
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
128 words
A flow control valve for a fluid medium comprising a housing having a valve seat, a hollow piston defining a cavity therein, said piston being movable in said housing along an axis toward and away from said valve seat, a dividing wall transverse to said axis in said cavity, said dividing wall being movable along said axis relative to said piston, first sealing means between said piston and said housing, second sealing means between said piston and said dividing wall, a closed chamber formed by said housing, said piston, said dividing wall, and said first and second sealing means opposite from said valve seat, said closed chamber having an incompressible hydraulic fluid therein, and adjusting means for controlling the position of said piston relative to said valve seat.
Claim 2
Dependent Claim
128 words
A flow control valve for a fluid medium comprising a housing having a valve seat, a hollow piston defining a cavity therein, said piston being movable in said housing along an axis toward and away from said valve seat, a dividing wall transverse to said axis in said cavity, said dividing wall being movable along said axis relative to said piston, first sealing means between said piston and said housing, second sealing means between said piston and said dividing wall, a closed chamber formed by said housing, said piston, said dividing wall, and said first and second sealing means opposite from said valve seat, said closed chamber having an incompressible hydraulic fluid therein, and adjusting means for controlling the position of said piston relative to said valve seat.
Claim 3
Dependent Claim
23 words
A flow control valve as in claim 1 wherein said first sealing means is a diaphragm fixed to said housing and said piston.
Claim 4
Dependent Claim
27 words
A flow control valve as in claim 1 wherein said first and second sealing means are diaphragms which are integrally formed from a single piece of material.
Claim 5
Dependent Claim
24 words
A flow control valve as in claim 1 wherein said second sealing means comprises a diaphragm fixed to said piston and said dividing wall.
Claim 6
Dependent Claim
26 words
A flow control valve as in claim 4 wherein said diaphragm extends completely across said cavity, said dividing wall being a plate fixed to said diaphragm.
Claim 7
Dependent Claim
22 words
A flow control valve as in claim 1 further comprising a perforated plate fixed to said piston and facing said valve seat.
Claim 8
Dependent Claim
31 words
A flow control valve as in claim 1 further comprising means for adjusting the position of the valve seal relative to the housing along the axis of movement of the piston.
Claim 9
Dependent Claim
20 words
A flow control valve as in claim 1 further comprising first spring means urging said piston toward said valve seat.
Claim 10
Dependent Claim
31 words
A flow control valve as in claim 7 further comprising second spring means urging said piston away from said valve seat, said first and second spring means having different spring characteristics.
Claim 11
Dependent Claim
22 words
A flow control valve as in claim 9 wherein said first and second spring means comprise respective first and second helical springs.
Claim 12
Dependent Claim
16 words
A flow control valve as in claim 1 wherein said adjusting means comprises an electromagnetic drive.
Claim 13
Dependent Claim
15 words
A flow control valve as in claim 11 wherein said electromagnetic drive comprises a servomotor.
Claim 14
Dependent Claim
18 words
A flow control valve as in claim 1 wherein said adjusting means is located in said closed chamber.
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) | 1996-02-23 | 1996-08-24 | 1997-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-23 | 2000-08-24 | 2001-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-23 | 2004-08-24 | 2005-02-23 | $7700.00 | Window Closed / Lapsed |