GB994858A - Pneumatic control device - Google Patents
Pneumatic control deviceInfo
- Publication number
- GB994858A GB994858A GB1742363A GB1742363A GB994858A GB 994858 A GB994858 A GB 994858A GB 1742363 A GB1742363 A GB 1742363A GB 1742363 A GB1742363 A GB 1742363A GB 994858 A GB994858 A GB 994858A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- diaphragm
- valve
- chamber
- space
- 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
- 230000000994 depressogenic effect Effects 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/044—Systems in which all treatment is given in the central station, i.e. all-air systems
- F24F3/048—Systems in which all treatment is given in the central station, i.e. all-air systems with temperature control at constant rate of air-flow
- F24F3/052—Multiple duct systems, e.g. systems in which hot and cold air are supplied by separate circuits from the central station to mixing chambers in the spaces to be conditioned
- F24F3/0522—Multiple duct systems, e.g. systems in which hot and cold air are supplied by separate circuits from the central station to mixing chambers in the spaces to be conditioned in which warm or cold air from the central station is delivered via individual pipes to mixing chambers in the space to be treated, the cold air/warm air ratio being controlled by a thermostat in the space concerned, i.e. so-called Dual-duct System
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Fluid Pressure (AREA)
- Fluid-Pressure Circuits (AREA)
- Fluid-Driven Valves (AREA)
Abstract
994,858. Fluid-pressure servomotor systems. ROBERTSHAW CONTROLS CO. May 2, 1963 [May 9,1962], No. 17423/63. Heading G3P. A cold air valve 16 operated by a pneumatic piston actuator 20 and a hot air valve 18 also operated by a similar actuator 22 feed air through a conduit 30 to a space to be heated and are controlled by apparatus 32 having a signal pressure line 128 from a thermally responsive means in the space and operative to increase the signal pressure in response to increase of temperature, and static pressure connections 82, 86 leading to opposite sides of a diaphragm 78 for exercising control of the flow rate to the space. An adjustment means 108,102 varies the spring-loading on the diaphragm to set the desired rate of flow which is controlled by a flapper 98 actuated by the diaphragm and determining the pressure in a chamber 62 which, through a diaphragm 42 and plate 50, controls pressure in a chamber 46 by means of a valve member 52 coacting with a fixed seat 53 communicating with a pressure supply chamber 38 and with a movable seat 56 communicating through a passage 60 with atmosphere. Increase of flow to the space to be heated causes the flapper to increase the pressure in chamber 62 which results in an increase of pressure in the chamber 46 and a consequent closing action of the valve 16 whose actuator is connected by a pipe 24 with the chamber 46. At the same time, signal pressure from the thermally responsive means is transmitted past a diaphragm 118, which is normally depressed, to a pipe 26 to actuate the valve 18. Should the valve 16 become fully closed and the flow rate still be above the desired valve pressure in the chamber 46, passing through a passage 126, will lift the diaphragm 118 and have access through openings 120 to the pipe 26. Control of the valve 18 is thus transferred from the thermally responsive means to the flow responsive means until the desired temperature is again reached in the space, when the signal pressure will again depress the diaphragm 118.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US19352262A | 1962-05-09 | 1962-05-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB994858A true GB994858A (en) | 1965-06-10 |
Family
ID=22713972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1742363A Expired GB994858A (en) | 1962-05-09 | 1963-05-02 | Pneumatic control device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB994858A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3045396A1 (en) * | 1980-12-02 | 1982-07-01 | Kessler & Luch Gmbh, 6300 Giessen | Ventilator air flow controlled by moving throttle - in apertured pipe extension spaced from housing wall |
-
1963
- 1963-05-02 GB GB1742363A patent/GB994858A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3045396A1 (en) * | 1980-12-02 | 1982-07-01 | Kessler & Luch Gmbh, 6300 Giessen | Ventilator air flow controlled by moving throttle - in apertured pipe extension spaced from housing wall |
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