US3744848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control valve
Assignee: Echlin Inc
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Filing: 1971-09-07
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Granted: 1973-07-10
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Expires: 1991-09-07
Abstract
Abstract A control valve is provided in a fluid pressure system with selectively operable means for controlling the application of fluid pressure from separate sources thereof to a spring setting, pressure released actuator for energizing a brake in an air brake system, and resiliently urged means are provided in said control valve to drive said selectively operable means to a position automatically venting said actuator and energizing said brake upon the occurrence of a predetermined low pressure at one of said sources. A uni-directional flow valve is provided in the control valve to prevent the reduction of fluid pressure at the brake actuator and the gradual spring setting energization of the brake prior to the automatic actuation of the selectively operable means by said resiliently urged means in response to the predetermined low pressure at the one source.
Inventors
- 👤 D Hardwick
- 👤 R Kersting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:53
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/26; B60T13/261; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2557
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
314 words
A control valve comprising a housing, first and second inlet ports and an outlet port in said housing, first and second valve seats in said housing between said first inlet port and outlet port and between said second inlet port and outlet port, respectively, a first valve normally urged into engagement with said first valve seat interrupting pressure fluid communication between said first inlet port and said outlet port, an exhaust passage in said first valve between said outlet port and the atmosphere, a third valve seat on said first valve about said exhaust passage, a valve stem reciprocally movable in said housing and extending through said second valve seat including a second valve normally disengaged from said second valve seat to establish pressure fluid communication between said first inlet port and said outlet port, and a third valve normally engaged with said third valve seat closing said exhaust passage, said valve stem being manually movable in response to an applied force thereon in one direction to engage said second valve with said second valve seat interrupting pressure fluid communication between said second inlet port and said outlet port and disengage said third valve from said third valve seat venting said outlet to the atmosphere, an abutment on said stem for driving engagement with said first valve, said stem also being movable in a direction opposite to the one direction to drivingly engage said abutment with said first valve and concertedly move said first valve toward a position disengaged from said first valve seat to establish pressure fluid communication between said first inlet port and said outlet port, a sealing cup having inner and outer lips sealably engaged between said housing and stem and disposed in said housing between said second inlet port and said outlet port to isolate said second inlet port when said first valve is disengaged from said first valve seat.
Claim 2
Dependent Claim
314 words
A control valve comprising a housing, first and second inlet ports and an outlet port in said housing, first and second valve seats in said housing between said first inlet port and outlet port and between said second inlet port and outlet port, respectively, a first valve normally urged into engagement with said first valve seat interrupting pressure fluid communication between said first inlet port and said outlet port, an exhaust passage in said first valve between said outlet port and the atmosphere, a third valve seat on said first valve about said exhaust passage, a valve stem reciprocally movable in said housing and extending through said second valve seat including a second valve normally disengaged from said second valve seat to establish pressure fluid communication between said first inlet port and said outlet port, and a third valve normally engaged with said third valve seat closing said exhaust passage, said valve stem being manually movable in response to an applied force thereon in one direction to engage said second valve with said second valve seat interrupting pressure fluid communication between said second inlet port and said outlet port and disengage said third valve from said third valve seat venting said outlet to the atmosphere, an abutment on said stem for driving engagement with said first valve, said stem also being movable in a direction opposite to the one direction to drivingly engage said abutment with said first valve and concertedly move said first valve toward a position disengaged from said first valve seat to establish pressure fluid communication between said first inlet port and said outlet port, a sealing cup having inner and outer lips sealably engaged between said housing and stem and disposed in said housing between said second inlet port and said outlet port to isolate said second inlet port when said first valve is disengaged from said first valve seat.
References Cited (Backward Citations)
US2986153A
Cited
US3314438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |