US3650286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic selector valve
Assignee: Federal Aviation Administration
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Filing: 1970-05-13
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Granted: 1972-03-21
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Expires: 1990-05-13
Abstract
Abstract An automatic pressure responsive selector valve for automatically supplying pressure from three independent hydraulic systems, one of which is maintained in a standby status, into two working systems such that in the event of a failure of one of the supply systems the selector valve activates the standby system into a working system; and upon the further failure of a second supply system, the selector valve divides the fluid flow from the remaining pressurized system into the two working systems.
Inventors
- 👤 George B Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:25
CPC Classifications
F; F15; F15B; F15B18/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2516; Y10T137/2559; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86606
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
A selector valve for automatically supplying pressurized fluid from three independent hydraulic systems, one of which is in a standby status, into two working systems, comprising: dual slide valves, each being connected to one of the independent hydraulic systems and jointly connected to the standby system for controlling the flow of pressurized fluid into two working systems; means interconnecting the slide valves and effective when the fluid pressure decreases in one of the independent hydraulic systems supplying a working system for disconnecting said decreased pressure system and activating the standby system into that working system, said dual slide valves further including centering spool means positioned at one end of each slide valve for preventing movement of the valve spool as long as the hydraulic pressure of the independent hydraulic system supplying a centering spool is maintained.
Claim 2
Dependent Claim
136 words
A selector valve for automatically supplying pressurized fluid from three independent hydraulic systems, one of which is in a standby status, into two working systems, comprising: dual slide valves, each being connected to one of the independent hydraulic systems and jointly connected to the standby system for controlling the flow of pressurized fluid into two working systems; means interconnecting the slide valves and effective when the fluid pressure decreases in one of the independent hydraulic systems supplying a working system for disconnecting said decreased pressure system and activating the standby system into that working system, said dual slide valves further including centering spool means positioned at one end of each slide valve for preventing movement of the valve spool as long as the hydraulic pressure of the independent hydraulic system supplying a centering spool is maintained.
Claim 3
Dependent Claim
151 words
A selector valve for automatically supplying pressurized fluid from three independent hydraulic systems, one of which is in a standby status, into two working systems, comprising: dual slide valves, each being connected to one of the independent hydraulic systems and jointly connected to the standby system for controlling the flow of pressurized fluid into two working systems; means interconnecting the slide valves and effective when the fluid pressure decreases in one of the independent hydraulic systems supplying a working system for disconnecting said decreased pressure system and activating the standby system into that working system, said means interconnecting the dual slide valves comprising linkage means pivotally mounted between the dual slide valves and having spring biasing means foR resisting pivotal movement thereof, whereby a predetermined pressure differential is required between the independent hydraulic systems connected to the slide valves before the decreased pressure system is disconnected and the standby system activated.
Claim 4
Dependent Claim
151 words
A selector valve for automatically supplying pressurized fluid from three independent hydraulic systems, one of which is in a standby status, into two working systems, comprising: dual slide valves, each being connected to one of the independent hydraulic systems and jointly connected to the standby system for controlling the flow of pressurized fluid into two working systems; means interconnecting the slide valves and effective when the fluid pressure decreases in one of the independent hydraulic systems supplying a working system for disconnecting said decreased pressure system and activating the standby system into that working system, said means interconnecting the dual slide valves comprising linkage means pivotally mounted between the dual slide valves and having spring biasing means foR resisting pivotal movement thereof, whereby a predetermined pressure differential is required between the independent hydraulic systems connected to the slide valves before the decreased pressure system is disconnected and the standby system activated.
Claim 5
Dependent Claim
148 words
A selector valve system for automatically supplying pressurized fluid from three independent hydraulic systems, one of which is in a standby status, into a working system, comprising: a pair of slide valves, each being connected to one of the independent hydraulic systems and jointly connected to the standby system for controlling the flow of pressurized fluid into two working systems; means interconnecting the slide valves and effective when the fluid pressure decreases in one of the independent hydraulic systems supplying a working system for disconnecting said decreased pressure system and activating the standby system into that working system; and a third slide valve means effective when the fluid pressure decreases in one of the remaining two independent hydraulic systems each supplying a working system, for disconnecting said decreased pressure system and dividing the flow of fluid from the remaining pressurized independent hydraulic system into the two working systems.
Claim 6
Dependent Claim
148 words
A selector valve system for automatically supplying pressurized fluid from three independent hydraulic systems, one of which is in a standby status, into a working system, comprising: a pair of slide valves, each being connected to one of the independent hydraulic systems and jointly connected to the standby system for controlling the flow of pressurized fluid into two working systems; means interconnecting the slide valves and effective when the fluid pressure decreases in one of the independent hydraulic systems supplying a working system for disconnecting said decreased pressure system and activating the standby system into that working system; and a third slide valve means effective when the fluid pressure decreases in one of the remaining two independent hydraulic systems each supplying a working system, for disconnecting said decreased pressure system and dividing the flow of fluid from the remaining pressurized independent hydraulic system into the two working systems.
Claim 7
Dependent Claim
52 words
The selector valve system set forth in claim 3 wherein said pair of slide valves further include; centering spool means positioned at one end of each slide valve for preventing movement of the valve spool as long as the hydraulic pressure of the independent hydraulic system supplying a centering spool is maintained.
Claim 8
Dependent Claim
70 words
The selector valve system set forth in claim 3 wherein said means interconnecting the pair of slide valves comprises; linkage means pivotally mounted between the pair of slide valves and having spring biasing means for resisting pivotal movement thereof, whereby a predetermined pressure differential is required between the independent hydraulic systems connected to the pair of slide valves before the decreased pressure system is disconnected and the standby system activated.
References Cited (Backward Citations)
US3429328A
Cited
US3406702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |