US4531708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid valve
Assignee: Parker Hannifin Manufacturing Switzerland SA
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Filing: 1984-08-21
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Granted: 1985-07-30
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Expires: 2004-08-21
Abstract
Abstract A solenoid valve includes a body (2,25) with an internal intake pipe (26) and an internal outlet pipe (27), a coil (4) and a movable stem (3), urged by a spring (10) toward a valve closed position. The stem (3) defines, with a seat (30), an annular sealing surface (22), surrounded by a groove (17) and by an annular flange (18). The flange defines with an annular counterpart (25) placed opposite, an annular damping surface (23). The groove (17) communicates with the outlet pipe (27) through a longitudinal slot (12) provided in the stem (3). The annular flange (18) is in a position near or in contact with the counterpart (25) when the valve is closed. During a closing of the valve, the liquid between the annular flange (18) and the counterpart (25) escapes radially through the groove (17) from the annular damping surface. This produces a braking effect on the stem (3), to reduce wear on the annular sealing surface (22).
Inventors
- 👤 Jean Livet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:36
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0686; F16K31/0689; F16K31/0644; F16K31/0651; F16K31/0655; F16K31/0696; F16K47/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
119 words
A solenoid valve including a movable ferromagnetic stem selectively displaceable through a magnetic field produced by an exciting current with the ferromagnetic stem having a closing device cooperating with a seat to control fluid through the valve by defining with the seat an annular sealing surface in a closed valve position characterized by a damping device comprising at least a second annular surface encompassing the annular sealing surface and separated from the annular sealing surface by a space and cooperating with a counterpart third annular surface to define an annular damping surface when the closing device is in contact with the seat and at least one fluid passage communicating with the space between the second and third annular surfaces.
Claim 2
Dependent Claim
119 words
A solenoid valve including a movable ferromagnetic stem selectively displaceable through a magnetic field produced by an exciting current with the ferromagnetic stem having a closing device cooperating with a seat to control fluid through the valve by defining with the seat an annular sealing surface in a closed valve position characterized by a damping device comprising at least a second annular surface encompassing the annular sealing surface and separated from the annular sealing surface by a space and cooperating with a counterpart third annular surface to define an annular damping surface when the closing device is in contact with the seat and at least one fluid passage communicating with the space between the second and third annular surfaces.
Claim 3
Dependent Claim
19 words
A valve according to claim 1, and further characterized by the damping surface being larger than the sealing surface.
Claim 4
Dependent Claim
24 words
A valve according to claim 2 and further characterized by the space between the annular surfaces consisting of a groove in the movable stem.
Claim 5
Dependent Claim
23 words
A valve according to claim 2 and further characterized by the space between the annular surfaces consisting of a groove in the seat.
Claim 6
Dependent Claim
24 words
A valve according to claim 1, and further characterized by the space between the annular surfaces consisting of a groove in the movable stem.
Claim 7
Dependent Claim
20 words
A valve according to claim 5, and further characterized by the passage to the groove being in the movable stem.
Claim 8
Dependent Claim
19 words
A valve according to claim 5 and further characterized by the passage to the groove being in the seat.
Claim 9
Dependent Claim
23 words
A valve according to claim 5, and further characterized by the movable stem having at least one longitudinal slot communicating with the groove.
Claim 10
Dependent Claim
23 words
A valve according to claim 1, and further characterized by the space between the annular surfaces consisting of a groove in the seat.
Claim 11
Dependent Claim
20 words
A valve according to claim 9 and further characterized by the passage to the groove being in the movable stem.
Claim 12
Dependent Claim
19 words
A valve according to claim 9, and further characterized by the passage to the groove being in the seat.
Claim 13
Dependent Claim
22 words
A valve according to claim 1 and further characterized by a spring means arranged to urge the movable stem toward the seat.
Claim 14
Dependent Claim
29 words
A valve according to claim 1 and further characterized by a space between the second and third annular surfaces when the closing device is in contact with the seat.
Claim 15
Dependent Claim
21 words
A valve according to claim 1 and further characterized by a coplanor relationship between the seat and the third annular surface.
Claim 16
Dependent Claim
19 words
A valve according to claim 1 and further characterized by the third annular surface being noncoplanar with the seat.
References Cited (Backward Citations)
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Cited
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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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |