GB648871A - Improvements in or relating to indicating or control apparatus responsive to temperature variations - Google Patents
Improvements in or relating to indicating or control apparatus responsive to temperature variationsInfo
- Publication number
- GB648871A GB648871A GB1106348A GB1106348A GB648871A GB 648871 A GB648871 A GB 648871A GB 1106348 A GB1106348 A GB 1106348A GB 1106348 A GB1106348 A GB 1106348A GB 648871 A GB648871 A GB 648871A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- bulb
- liquid
- range
- high temperature
- 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
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/01—Control of temperature without auxiliary power
- G05D23/12—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
648,871. Temperature-responsive actuating-elements. NAPIER & SON, Ltd., D. April 22, 1948, No. 11063. [Class 64(ii)] [Also in Groups XX and XXIX] In apparatus for indicating or control in accordance with the temperature in a high temperature range, i.e. 815‹C.-935‹C., a small bore bulb 10 lies within a zone at the high temperature and is connected by a capillary tube 12 to a Bourdon tube 14 or like device outside the zone. Moreover, at temperatures below the high temperature range the system is full of liquid such as mercury at a pressure above its vapour pressure while at temparatures within the range the liquid in the bulb at least partly vaporizes and the pressure of this vapour determines the pressure in the system and thereby the position of the Bourdon tube. The bulb 10 is formed to have a volume equal to the volume of liquid required to expand the Bourdon tube through the high temperature range so that at the top end of the range the liquid is fully displaced from the bulb. Below the range, thermal expansion of the liquid controls the position of the Bourdon tube. A formula relating the volume and low temperature filling pressure of the bulb and the pressure-volume characteristic of the tube 14 is developed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1106348A GB648871A (en) | 1948-04-22 | 1948-04-22 | Improvements in or relating to indicating or control apparatus responsive to temperature variations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1106348A GB648871A (en) | 1948-04-22 | 1948-04-22 | Improvements in or relating to indicating or control apparatus responsive to temperature variations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB648871A true GB648871A (en) | 1951-01-17 |
Family
ID=9979312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1106348A Expired GB648871A (en) | 1948-04-22 | 1948-04-22 | Improvements in or relating to indicating or control apparatus responsive to temperature variations |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB648871A (en) |
-
1948
- 1948-04-22 GB GB1106348A patent/GB648871A/en not_active Expired
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