US3753447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic valves
Assignee: Individual
•
Filing: 1971-11-29
•
Granted: 1973-08-21
•
Expires: 1991-11-29
Abstract
Abstract A pneumatic control valve assembly has two valves in a common housing interconnected by a transfer duct. A first valve controls communication between an inlet and the transfer duct while the second valve controls communication between the transfer duct and an outlet. Operation of the second valve, for example by a lever, causes input pressure to be delivered to a point of use - e.g. an actuator. Back pressure is tapped from the outlet and operates an actuator in the housing which closes the first valve, so that a pressure pulse is delivered. The closure of the first valve ensures that subsequent interruption or failure of the supply pressure has no effect on the state of the valves.
Inventors
- 👤 J Davis
- 👤 Atkins C Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:23
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/10; F16K11/14; F16K11/16; F16K11/168; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
108 words
Pneumatic valve assembly comprising: a housing having an inlet and an outlet; first and second valves arranged within the housing and having respective open and closed positions; a transfer duct interconnecting said valves within said housing, said first valve controlling communication between the inlet and the transfer duct and said second valve controlling communication between the transfer duct and the outlet; operating means for said second valve; a bleed duct within said housing communicating with said outlet, and pneumatic actuator means connected to said bleed duct and acting upon said first valve, said actuator means being responsive to back pressure at said outlet to close said first valve.
Claim 2
Dependent Claim
108 words
Pneumatic valve assembly comprising: a housing having an inlet and an outlet; first and second valves arranged within the housing and having respective open and closed positions; a transfer duct interconnecting said valves within said housing, said first valve controlling communication between the inlet and the transfer duct and said second valve controlling communication between the transfer duct and the outlet; operating means for said second valve; a bleed duct within said housing communicating with said outlet, and pneumatic actuator means connected to said bleed duct and acting upon said first valve, said actuator means being responsive to back pressure at said outlet to close said first valve.
Claim 3
Dependent Claim
21 words
A valve assembly according to claim 1, including means responsive to closure of the second valve to open the first valve.
Claim 4
Dependent Claim
72 words
A valve assembly according to claim 2, wherein the means responsive to closure of the second valve comprise a further pneumatic actuator acting on the first valve, and further bleed duct means tapping pressure from the inlet, flow through said further bleed duct means being controlled by said second valve so that then the latter is closed pressure tapped from said inlet acts on said further actuator to open said first valve.
Claim 5
Dependent Claim
25 words
A valve assembly according to claim 2, wherein the means responsive to closure of the second valve comprise a mechanical interconnection between the two valves.
Claim 6
Dependent Claim
41 words
A valve assembly according to claim 4, wherein the valves have respective movable valve elements and wherein said mechanical interconnection between the two valves comprises a lever pivotally mounted on the housing and engageable with the movable elements of said valves.
Claim 7
Dependent Claim
18 words
A valve assembly according to claim 5, wherein said lever constitutes the operating means for said second valve.
Claim 8
Dependent Claim
34 words
A valve assembly according to claim 1, wherein said first and second valves comprise respective first and second bores in the housing and first and second spools arranged for axial displacement in said bores.
Claim 9
Dependent Claim
30 words
A valve assembly according to claim 1, including a plate sealed to one face of the valve housing the transfer duct being formed, at least in part, in said plate.
Claim 10
Dependent Claim
56 words
A valve assembly according to claim 1, wherein said housing is further provided with an exhaust port which communicates via the second valve with the outlet when the second valve is closed and which when the first valve is closed and the second valve is open communicates with the said outlet via the said transfer duct.
Claim 11
Dependent Claim
32 words
A valve assembly according to claim 1, wherein said pneumatic actuator means comprise a piston which acts on the first valve and which is supplied with back pressure through said bleed duct.
Claim 12
Dependent Claim
32 words
A valve assembly according to claim 1, including a plate sealed to one face of the housing, the bleed duct being formed, at least in part, by a channel in said plate.
Claim 13
Dependent Claim
46 words
A valve assembly according to claim 1, including a pressure relief valve in said bleed duct, said relief valve being normally closed and being adapted to open, to connect the bleed duct to said outlet, when the pneumatic pressure at said outlet exceeds a predetermined value.
Claim 14
Dependent Claim
18 words
A pneumatic valve assembly according to claim 1, wherein the second valve is spring-biased into its closed position.
References Cited (Backward Citations)
US2592352A
Cited
US2804883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |