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US3757818A
Expired / Lapsed
US
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Safety control valve system for fluid actuated devices
Assignee: Ross Operating Valve Co
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Filing: 1971-07-26
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Granted: 1973-09-11
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Expires: 1991-07-26
Abstract
Abstract Two normally closed three-way main valves are connected in series to supply fluid to an outlet port. When moved to their closed positions, the valves provide parallel connections from the outlet port to exhaust. Therefore, if either valve is stuck in an open or partially open position, movement of the other valve to its closed position will provide good exhausting capacity. Furthermore, there will be no substantial pressure at the outlet port until both valves are actuated to their open position. Movement of either valve to its exhaust position will completely stop the supply of air to the outlet port and provide a direct exhaust connection.
Inventors
- 👤 R Sweet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:20
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/14; B30B15/142; F; F15; F15B; F15B20/00; F15B20/001; F16; F16K; F16K31/00; F16K31/12; F16K31/42; F16K31/423; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87209
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
In a safety control valve system for fluid-actuated devices, a housing having a supply port, an outlet port and one or more exhaust ports, first and second normally closed three-way valves in said housing, each valve having supply and exhaust valve members, said valves being piston-operated, means connecting the supply valve members of said first and second valves in series between said supply and outlet ports, means connecting the exhaust valve members of said first and second valves in parallel between said outlet and exhaust ports, whereby the movement of either valve to its exhaust position when the other valve remains partially or fully in its supply position will result in a complete cutoff of fluid pressure from the supply to the outlet port and a direct connection from the outlet port to at least one of the exhaust ports through said parallel connecting means, and two normally closed pilot valves having outlet ports connected to the chambers of said pistons.
Claim 2
Dependent Claim
161 words
In a safety control valve system for fluid-actuated devices, a housing having a supply port, an outlet port and one or more exhaust ports, first and second normally closed three-way valves in said housing, each valve having supply and exhaust valve members, said valves being piston-operated, means connecting the supply valve members of said first and second valves in series between said supply and outlet ports, means connecting the exhaust valve members of said first and second valves in parallel between said outlet and exhaust ports, whereby the movement of either valve to its exhaust position when the other valve remains partially or fully in its supply position will result in a complete cutoff of fluid pressure from the supply to the outlet port and a direct connection from the outlet port to at least one of the exhaust ports through said parallel connecting means, and two normally closed pilot valves having outlet ports connected to the chambers of said pistons.
Claim 3
Dependent Claim
174 words
In a safety control valve system for fluid-actuated devices, a housing having a supply port, an outlet port and an exhaust port first and second normally closed poppet valves in said housing, each poppet valve having facing supply and exhaust valve members with a chamber therebetween common to both valves and connected to the outlet port, passageways connecting the supply valve members of both valves in series between said supply and outlet ports, a common exhaust chamber for both valves leading to the exhaust port, said common chamber being connected to the exhaust valve members of both valves in parallel and being separated from said passageway means, whereby a direct exhaust passage will be provided between the outlet port and exhaust port when either valve is in its exhaust position through said common exhaust chamber, each of said valves comprising a rod carrying said supply and exhaust valve members, springs urging said valve members toward their closed positions, and pistons adjacent said exhaust valve members for moving the valve members toward their open positions.
Claim 4
Dependent Claim
174 words
In a safety control valve system for fluid-actuated devices, a housing having a supply port, an outlet port and an exhaust port first and second normally closed poppet valves in said housing, each poppet valve having facing supply and exhaust valve members with a chamber therebetween common to both valves and connected to the outlet port, passageways connecting the supply valve members of both valves in series between said supply and outlet ports, a common exhaust chamber for both valves leading to the exhaust port, said common chamber being connected to the exhaust valve members of both valves in parallel and being separated from said passageway means, whereby a direct exhaust passage will be provided between the outlet port and exhaust port when either valve is in its exhaust position through said common exhaust chamber, each of said valves comprising a rod carrying said supply and exhaust valve members, springs urging said valve members toward their closed positions, and pistons adjacent said exhaust valve members for moving the valve members toward their open positions.
Claim 5
Dependent Claim
30 words
The combination according to claim 2, further provided with two solenoid-operated normally closed pilot valves Mounted on said housing and having outlet ports connected to the chambers of said pistons.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |