US3737602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control valve
Assignee: Wagner Electric Corp
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Filing: 1972-04-25
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Granted: 1973-06-05
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Expires: 1992-04-25
Abstract
Abstract A control valve for use in a dual or split braking system which has a proportioning valve therein generally operable to proportion the fluid pressure in one of the systems. The control valve is provided with a shuttle or warning piston movable from a normally centered position to opposed translated positions in response to a predetermined differential between the separate supplied fluid pressures in said systems acting thereon. A bypass passage is provided in the control valve connected in bypass relation with the proportioning valve, and a valve member is normally urged toward a position closing said by-pass passage. A lost motion connection is defined between the shuttle piston and valve member wherein said valve member is moved to a position opening the by-pass passage permitting the flow of one of the supplied fluid pressures therethrough in by-pass relation with the proportioning valve to obviate the proportioning function thereof upon the movement of the shuttle piston to one of its translated positions. It is also contemplated that the control valve can include the proportioning valve.
Inventors
- 👤 R Bueler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:47
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/226; B60T8/00; B60T8/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
318 words
A control valve comprising a housing having a bore therein, a pair of spaced inlet ports for subjection to separate substantially equal fluid pressures and connected with said bore, piston means movable in said bore between said inlet ports including a pair of opposed end portions respectively subjected to the fluid pressures at said inlet ports for comparing the magnitudes thereof, said piston means being movable from a normally centered position in said bore toward opposed translated positions therein in response to the fluid pressure at one of said inlet ports acting on one of said end portions in the event of the failure of the fluid pressure at the other of said inlet ports acting on the other of said end portions, an outlet port in said housing, said one inlet port being spaced between said outlet port and said piston means, a passage in said housing connected between said outlet port and said one inlet port, a valve seat within said bore about said passage and facing said one end portion, valve means within said bore on said one end portion and movable between a normal operative position urged into engagement with said valve seat to close said passage interrupting pressure fluid communication between said one inlet port and said outlet port and a disabled position disengaged from said valve seat to open said passage and establish open pressure fluid communication therethrough between said one inlet port and said outlet port, and said valve means defining a lost motion connection with said one end portion when said piston means is in its centered position, said piston means being movable toward one of its opposed translated positions through said lost motion connection to initially drivingly engage said one end portion with said valve means and thereafter concertedly move said valve means toward its disabled position upon the failure of the fluid pressure at said other inlet port.
Claim 2
Dependent Claim
318 words
A control valve comprising a housing having a bore therein, a pair of spaced inlet ports for subjection to separate substantially equal fluid pressures and connected with said bore, piston means movable in said bore between said inlet ports including a pair of opposed end portions respectively subjected to the fluid pressures at said inlet ports for comparing the magnitudes thereof, said piston means being movable from a normally centered position in said bore toward opposed translated positions therein in response to the fluid pressure at one of said inlet ports acting on one of said end portions in the event of the failure of the fluid pressure at the other of said inlet ports acting on the other of said end portions, an outlet port in said housing, said one inlet port being spaced between said outlet port and said piston means, a passage in said housing connected between said outlet port and said one inlet port, a valve seat within said bore about said passage and facing said one end portion, valve means within said bore on said one end portion and movable between a normal operative position urged into engagement with said valve seat to close said passage interrupting pressure fluid communication between said one inlet port and said outlet port and a disabled position disengaged from said valve seat to open said passage and establish open pressure fluid communication therethrough between said one inlet port and said outlet port, and said valve means defining a lost motion connection with said one end portion when said piston means is in its centered position, said piston means being movable toward one of its opposed translated positions through said lost motion connection to initially drivingly engage said one end portion with said valve means and thereafter concertedly move said valve means toward its disabled position upon the failure of the fluid pressure at said other inlet port.
Claim 3
Dependent Claim
38 words
A control valve according to claim 1, comprising spring means engaged between said valve means and said piston means urging said valve means into engagement with said valve seat when said piston means is in its centered position.
Claim 4
Dependent Claim
83 words
A control valve according to claim 1, comprising opposed abutment means on said valve means and said one end portion defining said lost motion connection and normally spaced apart when said valve means is engaged with said valve seat and said piston means is in its centered position, one of said abutment means being concertedly movable with said piston means toward its one translated position to engage the other of said abutment means and thereafter move said valve means to its disabled position.
Claim 5
Dependent Claim
51 words
A control valve according to claim 3, wherein said valve means includes an annular sleeve portion, an end wall portion connected with said sleeve portion and defining said other abutment means, extension means on said one end portion extending substantially coaxially into said sleeve portion and defining said one abutment means.
Claim 6
Dependent Claim
46 words
A control valve according to claim 4, comprising spring means engaged with said valve means urging said valve means into engagement with said valve seat when said first named means is in its centered position and urging said one abutment means toward said other abutment means.
Claim 7
Dependent Claim
199 words
A control valve according to claim 1, wherein said valve means includes an annular sleeve member having another bore therein, a pair of opposed end walls on said sleeve member extending radially inwardly of said other bore, a reduced extension on said one end portion and extending into said other bore, a pair of opposed abutments respectively on said extension And one of said end walls defining the lost motion connection and normally spaced from each other when said piston means is in its centered position and said valve means is engaged with said valve seat, a valve element connected with the other of said end walls for engagement with said valve seat, and spring means engaged between said valve means and said one end portion urging said valve element into engagement with said valve seat and urging one of said abutments toward the other thereof when said piston means is in its centered position, said piston means being movable toward its one translated position through the lost motion connection to initially engage said one abutment with said other abutment and thereafter concertedly move said valve means to its disabled position disengaging said valve element from said valve seat.
Claim 8
Dependent Claim
186 words
A control valve according to claim 1, comprising extension means on said other end portion and defining with said piston means an annular shoulder thereon, one and other effective areas on said one end portion and said extension means subjected to the fluid pressures at said one and other inlet ports, respectively, said one area being greater than said other area, another shoulder on said housing and adjacent to said other end portion, an annular centering piston movable in said housing between said extension means and said first named bore including opposed faces, a third effective area on one of said opposed faces subjected to the fluid pressure at said other inlet port and additive to said other area, the sum of said third and other areas being greater than said one area, and said centering piston being normally urged toward a position in said housing engaging the other face thereof with said first named and other shoulders in response to the fluid pressure at said other inlet port acting on said third area to oppose movement of said piston means toward its one translated position.
Claim 9
Dependent Claim
27 words
A control valve according to claim 5, comprising electrical switch means movable between circuit making and circuit breaking positions in response to movement of said piston means.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |