US3597010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure control valve
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1969-11-21
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Granted: 1971-08-03
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Expires: 1989-11-21
Abstract
Abstract A pressure-compensating valve for use with a hydraulic skid control brake system wherein a cylindrical bar stock piece is machined to provide a center flow pintle cooperable with an annular scanning annulus, thereby to provide a stepped and partially infinitely variable valve which permits partial or full diameter area sections to freely be sensed in a balanced state relieving any tendency for the pressure-compensating valve to bind or otherwise develop hydraulic imbalance.
Inventors
- 👤 George A Berman
- 👤 Graydon J Choinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:00
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/40; B60T8/4095; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2579; Y10T137/2587
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
218 words
A pressure-compensating valve for a hydraulic skid control system comprising: a housing having a cylindrical valve bore closed at one end and a counterbored spring recess axially adjacent thereto at the other end and being vented to drain, a scanning annulus formed in said housing around said bore between said two ends, and a pintle valve in said valve bore, sAid pintle valve having a closed end wall adjacent the closed end of said cylindrical valve bore, a hollow interior and having an open end projecting into said spring recess, continuous biasing means connected to said open end of said pintle valve and loading said pintle valve in one direction, first and second passage means formed in said housing leading to and from said annulus from a source of pressure generated by a wheel-driven pump and to a vehicle braking means respectively, and from said first passage means to the closed end of said valve bore, and a plurality of orifices in the walls of said pintle valve arranged and disposed in longitudinal rows and having successively decreasing areas from one end of the row to the other, whereby the full diameter areas will be freely sensed in a balanced state and any tendency of the pressure-compensating valve to bind or to develop hydraulic imbalance will be relieved.
Claim 2
Dependent Claim
218 words
A pressure-compensating valve for a hydraulic skid control system comprising: a housing having a cylindrical valve bore closed at one end and a counterbored spring recess axially adjacent thereto at the other end and being vented to drain, a scanning annulus formed in said housing around said bore between said two ends, and a pintle valve in said valve bore, sAid pintle valve having a closed end wall adjacent the closed end of said cylindrical valve bore, a hollow interior and having an open end projecting into said spring recess, continuous biasing means connected to said open end of said pintle valve and loading said pintle valve in one direction, first and second passage means formed in said housing leading to and from said annulus from a source of pressure generated by a wheel-driven pump and to a vehicle braking means respectively, and from said first passage means to the closed end of said valve bore, and a plurality of orifices in the walls of said pintle valve arranged and disposed in longitudinal rows and having successively decreasing areas from one end of the row to the other, whereby the full diameter areas will be freely sensed in a balanced state and any tendency of the pressure-compensating valve to bind or to develop hydraulic imbalance will be relieved.
Claim 3
Dependent Claim
169 words
In a hydraulic skid control brake system, a wheel-driven pump for discharging fluid to a braking system, a pressure-compensating valve including a housing formed with passage means through which the discharge of the pump is directed, said housing having a bore in which a pintle valve is axially slidable, said bore having a scanning annulus circumscribing said pintle valve, said bore and said pintle valve both being closed on one end whereby the closed end of the pintle valve forms a motive surface communicating with pump inlet for pressure loading. a continuous biasing means loading said pintle valve in a direction opposite to the pressure loading on said motive surface, and a plurality of orifices in the walls of said pintle valve which orifices are disposed in longitudinal rows and are of decreasing diameter, whereby the slowing down of the vehicle wheel causes the flow to drop from the wheel-driven pump so that the system will try to adjust to a larger sized hole and a lesser system pressure.
Claim 4
Dependent Claim
169 words
In a hydraulic skid control brake system, a wheel-driven pump for discharging fluid to a braking system, a pressure-compensating valve including a housing formed with passage means through which the discharge of the pump is directed, said housing having a bore in which a pintle valve is axially slidable, said bore having a scanning annulus circumscribing said pintle valve, said bore and said pintle valve both being closed on one end whereby the closed end of the pintle valve forms a motive surface communicating with pump inlet for pressure loading. a continuous biasing means loading said pintle valve in a direction opposite to the pressure loading on said motive surface, and a plurality of orifices in the walls of said pintle valve which orifices are disposed in longitudinal rows and are of decreasing diameter, whereby the slowing down of the vehicle wheel causes the flow to drop from the wheel-driven pump so that the system will try to adjust to a larger sized hole and a lesser system pressure.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |