GB536537A - Improvements in or relating to control mechanisms for maintaining potential variables at desired values - Google Patents
Improvements in or relating to control mechanisms for maintaining potential variables at desired valuesInfo
- Publication number
- GB536537A GB536537A GB3023039A GB3023039A GB536537A GB 536537 A GB536537 A GB 536537A GB 3023039 A GB3023039 A GB 3023039A GB 3023039 A GB3023039 A GB 3023039A GB 536537 A GB536537 A GB 536537A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bellows
- pressure
- proportional
- restriction
- subject
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/44—Automatic controllers pneumatic only
- G05B11/48—Automatic controllers pneumatic only with auxiliary power
- G05B11/50—Automatic controllers pneumatic only with auxiliary power in which the output signal represents a continuous function of the deviation from the desired value, i.e. continuous controllers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
536,537. Fluid-pressure servomotor-control systems. FARRINGTON, G. H. Nov. 16, 1939, Nos. 30230/39, 5646/40 and 9100/40. [Class 135] An automatic control system for maintaining a variable such as temperature, humidity, liquid level, fluid flow or pressure, pH concentration, voltage or amperage of an electric current, speed, the feeding of solid material or the intensity of light or sound at a desired value includes a series of fluid pressure balances or equivalent devices whereby a controlling effect is obtained having three components which at any given time are proportional respectively to the departure of the variable from the desired value, to the time integral of the said departure and to the time differential of the said departure. Second and subsequent derivative components may also be included. In the form shown in Fig. 1 a balance beam subject to a controlling impulse f and to the action of two bellows 7 , 8 actuates a leak-off valve on a supply conduit 5 fitted with an adjustable throttle 4 to produce a pressure difference p<SP>1</SP> across an adjustable restriction 9 proportional to the controlling impulse. The flow past the restriction 9 which is such that the flow is proportional to the pressure difference passes into the bellows 8 and associated chambers to produce a pressure p<SP>2</SP> proportional to the time integral of p<SP>1</SP>. A second balance beam is actuated by three bellows 11, 12, 13 to actuate a leak-off valve 14 on a supply conduit fitted with a throttle. The bellows 11, 12 are subject to the pressures in either side of the restriction 9 and the bellows 13 receives pressure through an adjustable restriction 15 under the control of the valve producing a pressure p across the restriction 15 proportional to the time differential of the controlling impulse. A third balance beam is subject to the action of a bellows 16 receiving the pressure p<SP>2</SP> and bellows 17 receiving a pressure p<SP>5</SP> equal to the sum of the pressures p<SP>1</SP> and p<SP>3</SP> and actuates a leak-off valve 20 on a throttled fluid supply conduit to produce a pressure in a bellows p<SP>6</SP> and the connecting devices proportional to the sum of these three pressures. The balance beams are loaded by weights 10, 10a 10b preferably having a value approximating half the pressure range of the device. These weights may, however, be replaced by bellows subject to the supply pressure or to a further regulating impulse. In a modification only two balance beams are employed: In this arrangement the bellows 12 and the third balance beam are omitted. In another form using three balance beams the first beam is actuated by a single bellows while the others are each acted on by four bellows.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3023039A GB536537A (en) | 1939-11-16 | 1939-11-16 | Improvements in or relating to control mechanisms for maintaining potential variables at desired values |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3023039A GB536537A (en) | 1939-11-16 | 1939-11-16 | Improvements in or relating to control mechanisms for maintaining potential variables at desired values |
Publications (1)
Publication Number | Publication Date |
---|---|
GB536537A true GB536537A (en) | 1941-05-19 |
Family
ID=10304345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3023039A Expired GB536537A (en) | 1939-11-16 | 1939-11-16 | Improvements in or relating to control mechanisms for maintaining potential variables at desired values |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB536537A (en) |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2455184A (en) * | 1945-12-20 | 1948-11-30 | Hagan Corp | Totalizing device |
US2514445A (en) * | 1946-04-20 | 1950-07-11 | Honeywell Regulator Co | Control instrument |
US2626626A (en) * | 1948-08-10 | 1953-01-27 | Republic Flow Meters Co | Instrument for producing a regulated force responsive to a condition |
US2638919A (en) * | 1951-01-10 | 1953-05-19 | Taylor Instrument Co | Apparatus for controlling a process |
US2667886A (en) * | 1946-12-19 | 1954-02-02 | Oswald C Brewster | Fluid pressure transmitter |
US2675818A (en) * | 1951-12-06 | 1954-04-20 | Curtiss Wright Corp | Fluid pressure control mechanism |
US2677385A (en) * | 1950-04-26 | 1954-05-04 | Hagan Corp | Regulating apparatus providing proportional band regulation with automatic reset andrate of action response to input signal |
US2737962A (en) * | 1948-05-25 | 1956-03-13 | Neyrpic Ets | Speed regulators for turbines |
US2755813A (en) * | 1943-08-05 | 1956-07-24 | Ilford Ltd | Discriminating pneumatic amplifier |
US2756774A (en) * | 1950-04-21 | 1956-07-31 | Hagan Corp | Pneumatic toggle devices provided with adjustable fulcrums |
US2767725A (en) * | 1953-06-22 | 1956-10-23 | Marquardt Aircraft Company | Pressure ratio regulator |
US2774367A (en) * | 1952-08-07 | 1956-12-18 | Honeywell Regulator Co | Air-operated controller having manually adjustable restrictions giving integral or reset, differential or rate, and proportional band-adjustment modes of operation |
US2776670A (en) * | 1951-09-29 | 1957-01-08 | Fisher Governor Co | Pressure fluid operated balanced control system |
US2786481A (en) * | 1949-08-09 | 1957-03-26 | Hagan Corp | Pressure differential responsive devices |
US2823688A (en) * | 1953-04-09 | 1958-02-18 | Honeywell Regulator Co | Controller |
US2860650A (en) * | 1952-11-01 | 1958-11-18 | Bailey Meter Co | Fluid pressure devices |
US3104810A (en) * | 1963-09-24 | Input | ||
US3126904A (en) * | 1964-03-31 | Response in automatic control | ||
US3159343A (en) * | 1962-01-22 | 1964-12-01 | Bell Corp | Analog computer |
US3180297A (en) * | 1961-05-03 | 1965-04-27 | Gen Dynamics Corp | Submarine hovering system |
US3197138A (en) * | 1961-06-12 | 1965-07-27 | Phillips Petroleum Co | Method of and apparatus for improved process control |
US3239139A (en) * | 1961-12-04 | 1966-03-08 | Garrett Corp | Pneumatic analog computer |
-
1939
- 1939-11-16 GB GB3023039A patent/GB536537A/en not_active Expired
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3126904A (en) * | 1964-03-31 | Response in automatic control | ||
US3104810A (en) * | 1963-09-24 | Input | ||
US2755813A (en) * | 1943-08-05 | 1956-07-24 | Ilford Ltd | Discriminating pneumatic amplifier |
US2455184A (en) * | 1945-12-20 | 1948-11-30 | Hagan Corp | Totalizing device |
US2514445A (en) * | 1946-04-20 | 1950-07-11 | Honeywell Regulator Co | Control instrument |
US2667886A (en) * | 1946-12-19 | 1954-02-02 | Oswald C Brewster | Fluid pressure transmitter |
US2737962A (en) * | 1948-05-25 | 1956-03-13 | Neyrpic Ets | Speed regulators for turbines |
US2626626A (en) * | 1948-08-10 | 1953-01-27 | Republic Flow Meters Co | Instrument for producing a regulated force responsive to a condition |
US2786481A (en) * | 1949-08-09 | 1957-03-26 | Hagan Corp | Pressure differential responsive devices |
US2756774A (en) * | 1950-04-21 | 1956-07-31 | Hagan Corp | Pneumatic toggle devices provided with adjustable fulcrums |
US2677385A (en) * | 1950-04-26 | 1954-05-04 | Hagan Corp | Regulating apparatus providing proportional band regulation with automatic reset andrate of action response to input signal |
US2638919A (en) * | 1951-01-10 | 1953-05-19 | Taylor Instrument Co | Apparatus for controlling a process |
US2776670A (en) * | 1951-09-29 | 1957-01-08 | Fisher Governor Co | Pressure fluid operated balanced control system |
US2675818A (en) * | 1951-12-06 | 1954-04-20 | Curtiss Wright Corp | Fluid pressure control mechanism |
US2774367A (en) * | 1952-08-07 | 1956-12-18 | Honeywell Regulator Co | Air-operated controller having manually adjustable restrictions giving integral or reset, differential or rate, and proportional band-adjustment modes of operation |
US2860650A (en) * | 1952-11-01 | 1958-11-18 | Bailey Meter Co | Fluid pressure devices |
US2823688A (en) * | 1953-04-09 | 1958-02-18 | Honeywell Regulator Co | Controller |
US2767725A (en) * | 1953-06-22 | 1956-10-23 | Marquardt Aircraft Company | Pressure ratio regulator |
US3180297A (en) * | 1961-05-03 | 1965-04-27 | Gen Dynamics Corp | Submarine hovering system |
US3197138A (en) * | 1961-06-12 | 1965-07-27 | Phillips Petroleum Co | Method of and apparatus for improved process control |
US3239139A (en) * | 1961-12-04 | 1966-03-08 | Garrett Corp | Pneumatic analog computer |
US3159343A (en) * | 1962-01-22 | 1964-12-01 | Bell Corp | Analog computer |
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