US3854500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate valve
Assignee: Combustion Engineering Inc
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Filing: 1972-12-29
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Granted: 1974-12-17
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Expires: 1992-12-29
Abstract
Abstract A large gate valve with a multiplicity of gates which are slidably guided in valve seats equipped with ridges or grooves to form a labyrinth seal between the gate and the seat. Each gate is pivotally connected to a driving means in a single central position to reduce the possibility of jamming when the gates are opened or closed. The opening and closing of each gate is further facilitated by a support means which lifts the gate against differential pressure on a cushion of air thereby decreasing the sliding friction.
Inventors
- 👤 T Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:27
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/0254; F16K3/30; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/8741; Y10T137/87491
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A gate valve for controlling flow of fluid under pressure comprising: a. a plurality of gates arranged in parallel; b. a plurality of valve bodies for receiving said gates; c. means on said valve bodies for providing a labyrinth seal between said gates and said valve bodies; d. means for moving said multiparallel gates in their planes between and across said labyrinth seal means for valve closing and opening; e. means pivotally interconnecting said gates and said moving means at one point for each gate, said point for each gate lying along a line passing through an individual gate''s center of mass parallel to the direction of movement of said gate, for transferring the force generated by said valve opening and closing means to said gates; and f. fluid support means positioned at the downstream side of said gates for reducing sliding friction between said gate and said valve body when opening and closing said gates by lifting said gates against said fluid pressure.
Claim 2
Dependent Claim
164 words
A gate valve for controlling flow of fluid under pressure comprising: a. a plurality of gates arranged in parallel; b. a plurality of valve bodies for receiving said gates; c. means on said valve bodies for providing a labyrinth seal between said gates and said valve bodies; d. means for moving said multiparallel gates in their planes between and across said labyrinth seal means for valve closing and opening; e. means pivotally interconnecting said gates and said moving means at one point for each gate, said point for each gate lying along a line passing through an individual gate''s center of mass parallel to the direction of movement of said gate, for transferring the force generated by said valve opening and closing means to said gates; and f. fluid support means positioned at the downstream side of said gates for reducing sliding friction between said gate and said valve body when opening and closing said gates by lifting said gates against said fluid pressure.
References Cited (Backward Citations)
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US2950897A
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US3135284A
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |