US3719401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid-operated hydraulic switching valve
Assignee: Fiat SpA
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Filing: 1971-07-26
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Granted: 1973-03-06
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Expires: 1991-07-26
Abstract
Abstract A solenoid-controlled hydraulic changeover valve is described, in which a movable solenoid armature, upon energization of the solenoid, closes a restrictor orifice in a movable obturator and simultaneously presses the obturator on to a seat, cutting off communication between an inlet and outlet; upon subsequent deenergization of the solenoid the fluid pressure derived from the valve inlet keeps the obturator against the valve seat so that the resumed flow of fluid to the outlet port is, at least initially, restricted by the obturator orifice. When the valve is connected in an anti-skid braking circuit in a by-pass line for the pressure fluid source, this mode of operation can be arranged to limit the rate of rise and fall of braking pressure during anti-skid braking modulation.
Inventors
- 👤 M Peruglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:29
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0644; F16K31/0655; B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T8/363; B60T8/44; B60T8/50; B60T8/5018; B60T8/5025; B60T8/5031; F16K15/00; F16K15/18; F16K15/182; F16K2200/00; F16K2200/30; F16K2200/305; F16K2200/3053; F16K2200/40; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7847; Y10T137/7869; Y10T137/7876
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
An electrically controlled changeover valve for use in hydraulic circuits, having an inlet port, an outlet port, a control solenoid, a magnetic armature, and means resiliently biasing the armature to a first position, the armature being movable to a second position by energization of the solenoid, and further including the improvement which consists in: means defining a chamber between the inlet and outlet ports; a valve seat coaxial with the outlet port; a movable obturator within the chamber, traversed by a flow restrictor opening, and resilient biasing means urging said obturator away from said valve seat, said armature upon energization of the solenoid pressing said obturator against said valve seat and closing said restrictor opening, thereby cutting off communication between said inlet port and said outlet port, and said obturator being maintained in engagement with said valve seat, after de-energization of the solenoid, by the fluid pressure in said chamber derived from the inlet port in use of the valve, whereby the resumed flow of fluid from the inlet port to the outlet port is at least initially restricted.
Claim 2
Dependent Claim
179 words
An electrically controlled changeover valve for use in hydraulic circuits, having an inlet port, an outlet port, a control solenoid, a magnetic armature, and means resiliently biasing the armature to a first position, the armature being movable to a second position by energization of the solenoid, and further including the improvement which consists in: means defining a chamber between the inlet and outlet ports; a valve seat coaxial with the outlet port; a movable obturator within the chamber, traversed by a flow restrictor opening, and resilient biasing means urging said obturator away from said valve seat, said armature upon energization of the solenoid pressing said obturator against said valve seat and closing said restrictor opening, thereby cutting off communication between said inlet port and said outlet port, and said obturator being maintained in engagement with said valve seat, after de-energization of the solenoid, by the fluid pressure in said chamber derived from the inlet port in use of the valve, whereby the resumed flow of fluid from the inlet port to the outlet port is at least initially restricted.
Claim 3
Dependent Claim
179 words
An electrically controlled changeover valve for use in hydraulic circuits, having an inlet port, an outlet port, a control solenoid, a magnetic armature, and means resiliently biasing the armature to a first position, the armature being movable to a second position by energization of the solenoid, and further including the improvement which consists in: means defining a chamber between the inlet and outlet ports; a valve seat coaxial with the outlet port; a movable obturator within the chamber, traversed by a flow restrictor opening, and resilient biasing means urging said obturator away from said valve seat, said armature upon energization of the solenoid pressing said obturator against said valve seat and closing said restrictor opening, thereby cutting off communication between said inlet port and said outlet port, and said obturator being maintained in engagement with said valve seat, after de-energization of the solenoid, by the fluid pressure in said chamber derived from the inlet port in use of the valve, whereby the resumed flow of fluid from the inlet port to the outlet port is at least initially restricted.
Claim 4
Dependent Claim
179 words
An electrically controlled changeover valve for use in hydraulic circuits, having an inlet port, an outlet port, a control solenoid, a magnetic armature, and means resiliently biasing the armature to a first position, the armature being movable to a second position by energization of the solenoid, and further including the improvement which consists in: means defining a chamber between the inlet and outlet ports; a valve seat coaxial with the outlet port; a movable obturator within the chamber, traversed by a flow restrictor opening, and resilient biasing means urging said obturator away from said valve seat, said armature upon energization of the solenoid pressing said obturator against said valve seat and closing said restrictor opening, thereby cutting off communication between said inlet port and said outlet port, and said obturator being maintained in engagement with said valve seat, after de-energization of the solenoid, by the fluid pressure in said chamber derived from the inlet port in use of the valve, whereby the resumed flow of fluid from the inlet port to the outlet port is at least initially restricted.
Claim 5
Dependent Claim
33 words
Valve according to claim 1 wherein said valve seat coaxial with the outlet port is formed by an annular wall projecting from an end wall of the chamber and surrounding said outlet port.
Claim 6
Dependent Claim
41 words
Valve according to claim 1, wherein said resilient biasing means acting on said obturator comprise a helical compression spring interposed between said obturator and the wall of the chamber surrounding the valve seat, said spring also acting as a centering spring.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |