US3794060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic control system and method of operating the same or the like
Assignee: Robertshaw Controls Co
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Filing: 1972-06-21
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Granted: 1974-02-26
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Expires: 1992-06-21
Abstract
Abstract Passage defining means interconnecting a source of pneumatic fluid to a pneumatically operated control device. Flow control variable restrictor means is disposed in the passage defining means intermediate the source and the control device whereby the passage defining means has a part thereof disposed between the restrictor means and the control device. A variable vent means is interconnected to the part of the passage defining means and is responsive to pressure in that part of the passage defining means. The flow control variable restriction means tends to maintain a substantially constant pneumatic flow in the part of the passage defining means even though the pressure in the part of the passage defining means varies and/or the pressure of the pneumatic source varies.
Inventors
- 👤 C Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:55
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/42; F; F15; F15B; F15B11/00; F15B11/08; F15B11/10; G05; G05D; G05D23/00; G05D23/185; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0396; Y10T137/2278; Y10T137/2365
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
269 words
A method for controlling a pneumatically operated control device comprising the steps of interconnecting a source of pneumatic fluid to said control device with a passage defining means, disposing a resilient washer-like member in said passage means so that the fluid flow from said source to said control device must pass through the opening through said washer-like member whereby said washer-like member comprises a flow control variable restrictor means, controlling the fluid flow in said passage defining means with said flow control variable restrictor means that is disposed in said passage defining means intermediate said source and said control device whereby said passage defining means has a part thereof between said restriction means and said control device, venting said part of said passage means with a variable vent means interconnected to said part of said passage defining means and being responsive to pressure in said part of said passage defining means, and varying said restrictor means to tend to maintain a substantially constant pneumatic flow in said part of said passage defining means even though the pressure in said part of said passage defining means is varying, said step of varying said restrictor means comprising the steps of reducing the size of the opening through said washer-like member upon an increase in the pressure differential across said resilient washer-like member by having the increased differential across said washer-like member centrally bow said washer-like member and increasing the size of the opening therethrough upon a decrease in the pressuRe differential across said resilient washer-like member by having the decreased differential across said washer-like member cause unbowing of said washer-like member.
Claim 2
Independent Claim
269 words
A method for controlling a pneumatically operated control device comprising the steps of interconnecting a source of pneumatic fluid to said control device with a passage defining means, disposing a resilient washer-like member in said passage means so that the fluid flow from said source to said control device must pass through the opening through said washer-like member whereby said washer-like member comprises a flow control variable restrictor means, controlling the fluid flow in said passage defining means with said flow control variable restrictor means that is disposed in said passage defining means intermediate said source and said control device whereby said passage defining means has a part thereof between said restriction means and said control device, venting said part of said passage means with a variable vent means interconnected to said part of said passage defining means and being responsive to pressure in said part of said passage defining means, and varying said restrictor means to tend to maintain a substantially constant pneumatic flow in said part of said passage defining means even though the pressure in said part of said passage defining means is varying, said step of varying said restrictor means comprising the steps of reducing the size of the opening through said washer-like member upon an increase in the pressure differential across said resilient washer-like member by having the increased differential across said washer-like member centrally bow said washer-like member and increasing the size of the opening therethrough upon a decrease in the pressuRe differential across said resilient washer-like member by having the decreased differential across said washer-like member cause unbowing of said washer-like member.
Claim 3
Dependent Claim
43 words
A method as set forth in claim 1 and including the step of also varying said restrictor means to tend to maintain a substantially constant pneumatic flow in said part of said passage defining means even though the pressure of said source varies.
Claim 4
Dependent Claim
106 words
A method as set forth in claim 1 wherein said step of venting said part of said passage defining means with a variable vent means comprises the step of interconnecting a valve seat to said part of said passage defining means, disposing a valve member relative to said valve seat for controlling the same, and operatively interconnecting spring means to said valve member to urge said valve member in one direction relative to said valve seat while the pressure in said part of said passage defining means acts on said valve member to urge said valve member in the opposite direction relative to said valve seat.
Claim 5
Dependent Claim
35 words
A method as set forth in claim 3 wherein said step of disposing said valve member relative to said valve seat comprises the step of disposing a ball valve member relative to said valve seat.
Claim 6
Dependent Claim
36 words
A method as set forth in claim 3 wherein said step of disposing said valve member relative to said valve seat comprises the step of disposing a flexible diaphragm valve member relative to said valve seat.
Claim 7
Dependent Claim
35 words
A method as set forth in claim 3 wherein said step of disposing said valve member relative to said valve seat comprises the step of disposing a needle-like valve member relative to said valve seat.
Claim 8
Dependent Claim
27 words
A method as set forth in claim 3 and including the step of adjusting said spring means to vary the force thereof acting on said valve member.
Claim 9
Dependent Claim
28 words
A method as set forth in claim 7 wherein said step of adjusting said spring means comprises the step of manually adjusting the force of said spring means.
Claim 10
Dependent Claim
30 words
A method as set forth in claim 7 wherein said step of adjusting said spring means comprises the step of adjusting said spring means in response to a sensed condition.
References Cited (Backward Citations)
US3621862A
Cited
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 |