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US3576292A Expired / Lapsed US ⏱️ 0.0 years remaining

Valve control system

Assignee: Raypak Inc
•
Filing: 1969-03-27
•
Granted: 1971-04-27
•
Expires: 1989-03-27
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Abstract

Abstract The system of the invention is exemplified in an electrical control system for modulating valves particularly gas valves, and especially wherein the valve is of a type which is positioned hydraulically by means of a motor pressurizing a hydraulic liquid. The particular valve is of a type embodying a bleed valve which when opened causes the valve to move to a closed position. The control system is a proportioning bridge type of system using control potentiometers. In the system the valve goes to a closed position when it reaches a predetermined position in its travel, for example, a 20 percent open position. This is accomplished by way of contacts operable when the modulating valve reaches this position causing the said bleed valve to open thereby bringing about closure of the modulating valve. Normal operation is resumed when the controlling potentiometer indicates a demand for valve opening of greater than 20 percent. This is accomplished by way of a sensitive circuit means using an SCR that senses a voltage at the control potentiometer indicative of a demand for valve opening of greater than 20 percent which brings about operation of further contacts which recloses the bleed valve causing normal operation to resume.

Inventors

  • 👤 Leo Block

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 12:35
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/06; F23N5/065; Y; Y10; Y10S; Y10S60/00; Y10S60/907

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 132 words
In a control system embodying a controller of the potentiometer-type having a slide wire and a slider associated therewith, a condition responsive sensor to automatically adjust the relative positions of the slider and slide wire, a control valve which is modulatingly adjusted in response to the controller over a range lying between a fully open position and a second position which is less than a fully closed position, first means responsive to actuation of said valve to said second position for causing said valve to assume a fully closed position, with control in response to the controller becoming suspended, voltage sensitive means responsive to movement of said controller to a position near one corresponding to said second position of said valve for causing said controller to resume modulating control of said valve.
Claim 2
Dependent Claim 132 words
In a control system embodying a controller of the potentiometer-type having a slide wire and a slider associated therewith, a condition responsive sensor to automatically adjust the relative positions of the slider and slide wire, a control valve which is modulatingly adjusted in response to the controller over a range lying between a fully open position and a second position which is less than a fully closed position, first means responsive to actuation of said valve to said second position for causing said valve to assume a fully closed position, with control in response to the controller becoming suspended, voltage sensitive means responsive to movement of said controller to a position near one corresponding to said second position of said valve for causing said controller to resume modulating control of said valve.
Claim 3
Dependent Claim 21 words
A system as in claim 1 including relay means responsive to said first means for transferring control to said last means.
Claim 4
Dependent Claim 28 words
A system as in claim 2 wherein said valve embodies a hydraulically driven means and a hydraulic pump, said first means comprising a valve for releasing hydraulic pressure.
Claim 5
Dependent Claim 32 words
A system as in claim 1 wherein said last means including a silicon controlled rectifier and means whereby said rectifier is caused to fire at a predetermined voltage sensed at said controller.
Claim 6
Dependent Claim 16 words
A system as in claim 3 comprising a switch for controlling said hydraulic pump and valve.
Claim 7
Dependent Claim 54 words
A system as in claim 5 wherein said last means comprises a voltage sensitive circuit including a silicon controlled rectifier and means whereby said rectifier is caused to fire at a predetermined voltage sensed at said controller, and contact means responsive to said circuit for shunting said switch controlling the hydraulic pump and valve.
Claim 8
Dependent Claim 38 words
A system as in claim 6 wherein said control system is of a proportioning type embodying a bridge circuit having in it balancing coils and control valve means adjustable thereby for controlling the pressure in the hydraulic means.

References Cited (Backward Citations)

US2576246A Cited
US2812909A Cited
US3358922A Cited
US3375659A Cited
US3393508A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-04-26 1974-10-26 1975-04-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-04-26 1978-10-26 1979-04-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-04-26 1982-10-26 1983-04-27 $7700.00 Window Closed / Lapsed

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