US3761050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic control system and reset valve for such a system or the like
Assignee: Robertshaw Controls Co
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Filing: 1971-05-20
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Granted: 1973-09-25
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Expires: 1991-05-20
Abstract
Abstract A pneumatic control system having a source of control fluid providing two different control pressure levels for respectively switching the control device of the system from one operating condition thereof to another operating condition thereof, the control device comprising a pair of condition controller means each having a sensor and a bleed type pneumatic valve operated thereby together with relay means operatively interconnected to the source for directing a branch signal of the control fluid to a pneumatically operated device in relation to a pilot signal directed to a pilot chamber of the relay means by one of the control means. A pressure responsive means is provided for switching the system from one condition controller means to the other in relation to the pressure level of the source, and a reset means is provided for overriding the pressure responsive means.
Inventors
- 👤 L Puster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:25
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/16; F16K31/165; F16K11/00; F16K11/02; F16K11/022; F16K31/14; F16K31/145
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
A pneumatically operated valve construction comprising frame mEans, a valve seat and a pneumatic actuator carried by said frame means, diaphragm means carried by said frame means and movable against and away from said valve seat, a first lever means pivotally carried by said frame means and carrying a member for engaging against said diaphragm means for opening and closing said valve seat, said first lever means being operatively interconnected to said actuator and being pivotally moved thereby relative to said valve seat, and a second lever means mounted to said frame means and being adapted to move said first lever means to a pivoted position thereof that maintains said valve seat in an open condition thereof regardless of the operating condition of said actuator when said second lever means is moved to one position thereof, said second lever means having an end adapted to be manually grasped for moving said second lever to said one position thereof.
Claim 2
Dependent Claim
158 words
A pneumatically operated valve construction comprising frame mEans, a valve seat and a pneumatic actuator carried by said frame means, diaphragm means carried by said frame means and movable against and away from said valve seat, a first lever means pivotally carried by said frame means and carrying a member for engaging against said diaphragm means for opening and closing said valve seat, said first lever means being operatively interconnected to said actuator and being pivotally moved thereby relative to said valve seat, and a second lever means mounted to said frame means and being adapted to move said first lever means to a pivoted position thereof that maintains said valve seat in an open condition thereof regardless of the operating condition of said actuator when said second lever means is moved to one position thereof, said second lever means having an end adapted to be manually grasped for moving said second lever to said one position thereof.
Claim 3
Dependent Claim
26 words
A pneumatically operated valve construction as set forth in claim 1 wherein said first lever means has opposed ends, one of said ends carrying said member.
Claim 4
Dependent Claim
26 words
A pneumatically operated valve construction as set forth in claim 2 wherein said first lever means is pivoted on said frame means intermediate said ends thereof.
Claim 5
Dependent Claim
26 words
A pneumatically operated valve construction as set forth in claim 1 wherein said frame means has a fulcrum edge against which said first lever means pivots.
Claim 6
Dependent Claim
149 words
A pneumatically operated valve construction comprising frame means, a valve seat and a pneumatic actuator carried by said frame means, diaphragm means carried by said frame means and movable against and away from said valve seat, lever means pivotally carried by said frame means and carrying a member for engaging against said diaphragm means for opening and closing said valve seat, said lever means being operatively interconnected to said actuator and being pivotally moved thereby relative to said valve seat, said lever means being pivoted on said frame means intermediate said ends thereof, and a second lever means being rotatably mounted to said frame means and being adapted to cam the first-named lever means to a pivoted position thereof that maintains said valve seat in an open condition thereof regardless of the operating condition of said actuator when said second lever means is rotated out of one position thereof.
Claim 7
Dependent Claim
149 words
A pneumatically operated valve construction comprising frame means, a valve seat and a pneumatic actuator carried by said frame means, diaphragm means carried by said frame means and movable against and away from said valve seat, lever means pivotally carried by said frame means and carrying a member for engaging against said diaphragm means for opening and closing said valve seat, said lever means being operatively interconnected to said actuator and being pivotally moved thereby relative to said valve seat, said lever means being pivoted on said frame means intermediate said ends thereof, and a second lever means being rotatably mounted to said frame means and being adapted to cam the first-named lever means to a pivoted position thereof that maintains said valve seat in an open condition thereof regardless of the operating condition of said actuator when said second lever means is rotated out of one position thereof.
Claim 8
Dependent Claim
39 words
A pneumatically operated valve construction as set forth in claim 5 wherein the first-named lever has opening means therein for receiving said cam means of said second lever means when said second lever is in said one position thereof.
References Cited (Backward Citations)
FR76575E
Cited
US3464448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |