US3709460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve control system
Assignee: Robertshaw Controls Co
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Filing: 1971-03-12
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Granted: 1973-01-09
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Expires: 1991-03-12
Abstract
Abstract A valve control system including a valve body defining a flow control port having flow therethrough controlled by a poppet coupled with a pressure responsive member which forms one wall of a control chamber. Fluid flow through a bleed passage leading from the control chamber is controlled by a pilot valve which is itself controlled by an electric drive means. Current to the electric drive means is controlled by electrical resistance means which is formed with transverse portions disposed in heat exchange relationship with one another and flexible for movement toward and away from one another to adjust the rate of heat exchange between such portions to thereby adjust the mutual heating hereof and vary the overall resistance of such resistance means to control current to the electric drive means.
Inventors
- 👤 Intoch H Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:17
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/40; F16K31/02; F16K31/025
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
267 words
A valve control system comprising: a valve body formed with an inlet, an outlet and a flow control port disposed intermediate said inlet and outlet, a poppet for controlling flow through said port, said valve body further being formed with a pressure chamber including a pressurization passage and a bleed passage and having one wall thereof in the form of a pressure responsive member coupled with said poppet; a pilot valve for controlling the flow rate out said bleed passage; electric drive means for controlling said pilot valve; electrical resistance means having transverse portions in heat exchange relationship and flexible for movement toward and away from one another to adjust said heat exchange relationship, the electrical resistance of said portions being temperature responsive so current flow therethrough is responsive to the temperature thereof; control means for moving said portions toward and away from one another to adjust the proximity and mutual heat transfer therebetween so the electrical current passing through said electrical resistance means is correspondingly adjusted; and electrical circuit means connecting said resistance means with said drive means whereby said control means may be adjusted to adjust the spacing between said transverse portions to adjust the rate of mutual heat exchAnge therebetween to adjust the resistance of said resistor means to adjust the current to said drive means thereby adjusting said pilot valve to alter the flow rate out said bleed passage to effect a pressure change in said chamber thereby moving said pressure responsive member to adjust the position of said poppet with respect to said port thereby adjusting the flow rate through said port.
Claim 2
Dependent Claim
267 words
A valve control system comprising: a valve body formed with an inlet, an outlet and a flow control port disposed intermediate said inlet and outlet, a poppet for controlling flow through said port, said valve body further being formed with a pressure chamber including a pressurization passage and a bleed passage and having one wall thereof in the form of a pressure responsive member coupled with said poppet; a pilot valve for controlling the flow rate out said bleed passage; electric drive means for controlling said pilot valve; electrical resistance means having transverse portions in heat exchange relationship and flexible for movement toward and away from one another to adjust said heat exchange relationship, the electrical resistance of said portions being temperature responsive so current flow therethrough is responsive to the temperature thereof; control means for moving said portions toward and away from one another to adjust the proximity and mutual heat transfer therebetween so the electrical current passing through said electrical resistance means is correspondingly adjusted; and electrical circuit means connecting said resistance means with said drive means whereby said control means may be adjusted to adjust the spacing between said transverse portions to adjust the rate of mutual heat exchAnge therebetween to adjust the resistance of said resistor means to adjust the current to said drive means thereby adjusting said pilot valve to alter the flow rate out said bleed passage to effect a pressure change in said chamber thereby moving said pressure responsive member to adjust the position of said poppet with respect to said port thereby adjusting the flow rate through said port.
Claim 3
Dependent Claim
44 words
A valve control system as set forth in claim 1 wherein: said drive means includes a thermostatic element coupled with said pilot valve and a heat motor disposed in heat exchange relationship with said element and connected in electrical circuit with said resistance means.
Claim 4
Dependent Claim
28 words
A valve control system as set forth in claim 1 wherein: said pressure responsive element is in the form of a diaphragm having said poppet mounted centrally therein.
Claim 5
Dependent Claim
97 words
A valve control system as set forth in claim 1 wherein: said resistance means is in the form of a pair of longitudinally disposed resistors connected together on their proximate ends; said control means is coupled with said proximate ends; and said drive means includes a pair of opposed drive elements responsive to the rate of current flow therethrough to urge said pilot valve in respective opposite directions; and said circuit means includes a divided circuit incorporating said resistors in respective first and second legs thereof and said drive elements in respective third and fourth legs thereof.
Claim 6
Dependent Claim
75 words
A valve control system as set forth in claim 1 wherein: said pressurization and bleed passages terminate in respective confronting outlet and inlet control ports; said pilot valve is interposed between said control ports; and said drive means drives in operative upon adjustment of said adjustment means to adjust said pilot valve in one direction to reduce the flow rate out said inlet control port and increases the flow rate out said outlet control port.
Claim 7
Dependent Claim
65 words
A valve control system as set forth in claim 1 wherein: said drive means includes a thermostatic element connected with said pilot valve; a heat motor disposed in heat exchange relationship therewith; and said control means includes a sensing element for sensing a selected parameter and responsive to variations thereof to flexing said resistor means to alter the current flow rate through said heat motor.
Claim 8
Dependent Claim
36 words
A valve control system as set forth in claim 1 wherein: said resistor means is in the form of an elongated electrical lead coiled to form a plurality of individual coils to define said transverse portions.
Claim 9
Dependent Claim
55 words
A valve control system as set forth in claim 4 wherein: said drive elements are in the form of a pair of first and second co-extensive thermostatic blades disposed in opposed relationship and respective heat motors defining said third and fourth legs and disposed in heat exchange relationship with said respective first and second blades.
Claim 10
Dependent Claim
33 words
A valve control system as set forth in claim 4 wherein: said control means includes a sensor for sensing a selected parameter and responsive to variations thereof to proportionately flex said resistor means.
Claim 11
Dependent Claim
37 words
A valve control system as set forth in claim 4 wherein: said control means is in the form of a thermostatic blade connected with said resistance means and responsive to temperature changes to flex said resistance means.
Claim 12
Dependent Claim
34 words
A valve control system as set forth in claim 5 wherein: said pilot includes a pilot valve poppet pivotally mounted from said valve body and having one extremity thereof interposed between said control parts.
References Cited (Backward Citations)
US3465962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |