US3794076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve devices
Assignee: Whitnash PLC
•
Filing: 1971-07-28
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Granted: 1974-02-26
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Expires: 1991-07-28
Abstract
Abstract A valve device for controlling the supply of liquid pressure from a pump to two liquid pressure accumulators in a dual line liquid pressure braking system for a vehicle has an inlet port, two outlet ports and a vent port. The inlet port communicates with each outlet port via a respective non-return valve. Communication between the inlet port and the vent port is controlled by a normally closed valve which may be opened by means responsive directly or indirectly to the pressure at the outlet ports. The pressure responsive means responsive directly to the pressure at the outlet ports may comprise two pistons acting through a common beam which is hinged centrally to a plunger, movement of the plunger being arranged to open the normally closed valve. The valve device may include two fluid pressure responsive electric switches which are responsive to the pressure at a respective one of the outlet ports and which are arranged to operate a warning device.
Inventors
- 👤 L Chouings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:47
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T11/00; B60T11/10; B60T11/28; B60T11/32; B60T8/00; B60T8/18; B60T8/1812; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/264
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
187 words
A valve device for connecting a fluid pressure generating device to two fluid pressure devices, comprising a valve body having two outlet ports interconnected by a bore in the valve body, each outlet port being for connection to a respective one of the two fluid pressure storage devices, an inlet port for connection to said fluid pressure generating device, inlet conduit means opening at one end into a portion of said bore between said two outlet ports and at the other end into said inlet port, and non-return valve means to prevent the backflow of liquid from each outlet port to said inlet conduit means, wherein the improvement comprises: i. a vent port; ii. normally closed valve means controlling communication between said vent port and said inlet port; and iii. fluid pressure responsive means arranged to open said normally cloSed valve means and place said inlet port in communication with said vent port when the fluid pressure at said two outlet ports reaches a predetermined maximum value so that further fluid is not fed through the non-return valve means to said outlet ports from said inlet port.
Claim 2
Dependent Claim
187 words
A valve device for connecting a fluid pressure generating device to two fluid pressure devices, comprising a valve body having two outlet ports interconnected by a bore in the valve body, each outlet port being for connection to a respective one of the two fluid pressure storage devices, an inlet port for connection to said fluid pressure generating device, inlet conduit means opening at one end into a portion of said bore between said two outlet ports and at the other end into said inlet port, and non-return valve means to prevent the backflow of liquid from each outlet port to said inlet conduit means, wherein the improvement comprises: i. a vent port; ii. normally closed valve means controlling communication between said vent port and said inlet port; and iii. fluid pressure responsive means arranged to open said normally cloSed valve means and place said inlet port in communication with said vent port when the fluid pressure at said two outlet ports reaches a predetermined maximum value so that further fluid is not fed through the non-return valve means to said outlet ports from said inlet port.
Claim 3
Dependent Claim
112 words
A valve device according to claim 1, wherein the improvement further comprises: i. said normally closed valve means comprising a ball spring loaded onto a valve seating defined at one end of a cylindrical bore with which the vent port is in communication; ii. the fluid pressure responsive means comprising a plunger located slidably within the cylindrical bore, the plunger carrying an axially extending probe which projects towards the ball and is arranged to engage the ball and move the ball off its valve seating in order to place the inlet port in communication with the vent port; and iii. the plunger being responsive to the fluid pressure at each outlet port.
Claim 4
Dependent Claim
69 words
A valve device according to claim 2, the improvement further comprises: i. two pistons; ii. means by which movement of each piston is transmitted to the plunger; and iii. means by which the fluid pressure at each outlet port is applied to a respective one of said pistons so that the fluid pressure at each outlet port is transmitted to the plunger through a respective one of the pistons.
Claim 5
Dependent Claim
27 words
A valve device according to claim 3, wherein the improvement further comprises the two pistons being disposed symmetrically on opposite sides of the axis of the plunger.
Claim 6
Dependent Claim
46 words
A valve device according to claim 4, wherein the improvement further comprises a beam hinged to the plunger and engaged by the two pistons so that the plunger can be moved by movement of one only of the two pistons and by movement of both pistons.
Claim 7
Dependent Claim
55 words
A valve device according to claim 1, wherein the improvement further comprises: i. two fluid pressure responsive control means arranged to operate a respective one of two warning devices; and ii. means by which each fluid pressure responsive control means is subjected to the fluid pressure at a respective one of the two outlet ports.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |