CA1073421A - Thermostatic actuator for a valve for heating medium - Google Patents
Thermostatic actuator for a valve for heating mediumInfo
- Publication number
- CA1073421A CA1073421A CA275,173A CA275173A CA1073421A CA 1073421 A CA1073421 A CA 1073421A CA 275173 A CA275173 A CA 275173A CA 1073421 A CA1073421 A CA 1073421A
- Authority
- CA
- Canada
- Prior art keywords
- sensor
- operating element
- actuator according
- valve
- vapour
- 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
- G05D23/121—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid characterised by the sensing element
- G05D23/122—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid characterised by the sensing element using a plurality of sensing elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Temperature-Responsive Valves (AREA)
Abstract
ABSTRACT
The invention relates to a thermostatic actuator for a valve for heating ??dium, comprising a room temperature sensor having a liquid-vapour filling, and an operating element of which the effective pressure area becomes displaced under the action of the vapour pressure against the force of a spring.
The invention relates to a thermostatic actuator for a valve for heating ??dium, comprising a room temperature sensor having a liquid-vapour filling, and an operating element of which the effective pressure area becomes displaced under the action of the vapour pressure against the force of a spring.
Description
`` 1073421 The invention relates to a thermostatic actuator for a valve for heating medium, comprising a room temperature sensor having a liquid-vapour filling, and an operating element of which the effective pressure area becomes displaced under the action of the vapour pressure againt the force of a spring.
.
Many such actuators are known. They are often formed as an attachment for placing on a valve housing. A known contruction comprises an operating element of which the pressure chamber is - formed by a can carrying an inwardly directed flange at the open - 10 end and corrugated tubular bellows which have a movable base and are connected to the flange at the opposite end. The can may consist of thermally conductive metal and serve directly at the room temperature sensor.
Valves for heating medium that are regulated by means of i such thermostatic autuators permit so much heating medium to flow to the heat exchanger that the temperature set in the room is maintained. When a room is aired and the sensor is located in the region of the inflowing cold air, which is particularly the case when the sensor is arranged beneath the window or near the floor, the temperature that is determined is much too low and the valve is opened completely. The result of this is that the heat exchanger is constantly replenished with hot water and the room is overheated after the window is closed.
The invention is based on the problem of providing a thermostatic actuator of the aforementioned kind which prevents the excessive supply of heat during temporary airing of a room.
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. . .
:: ~ - ~ . .: . - -: -: ,- :: : . .
:
10734Zl This problem is solved according to the invention by a second room temperature sensor which likewise has a liquid-vapour filling but a lower response time constant than the first sensor, and by a second operating element of which the effective pressure area is less than that of the first operating element and is subjected to the vapour pressure in the second sensor in the -~
direction of the spring.
: .
With this construction, when there is a sudden temperature change the second sensor responds more'quickly than the first sensor. However, since the effect of the second sensor is opposite to that of the first sensor, a sudden temperature drop of the kind arising during airing will first cause the valve closing member to move in the closing direction. Contrary to hitherto, the heating means are therefore throttled. Only after a certain time wil-l the influence of the first sensor predominate; the direction of move-mént of the closure member is reversed; finally, it passes beyond the original position and opens the valve further. The response of the actuator to the sudden temperature drop therefore takes place with a considerable time delay. This delay can be such that during a conventional airing period, which rarely exceeds 10 minutes during the heating period, no unduly large quantities ~f heating medium can reach the heat exchanger. For slow temperature variations of the kind arising during the rest of the control period, the action of the second sensor has little influence on the control behaviour.
The different response time'constants of the two sensors can be achieved by the most varied expedients. In particular, the first sensor may be associated with a large mass and the' second _ 2 BM/ ; ~
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': , . . .
.. .
sensor with a small mass. This is achieved in a particularly simple manner in that the first sensor forms a unit with the first ` operating element, the unit exhibiting a chamber, and the second sensor is connected to the second operating element by a capillary tube. The effective mass stored by the second sensor is then determined only by the mass of the first sensor whereas the effective mass stored by the first sensor is formed by the total mass of the sensor and operating element as well as any other parts connected thereto.
Another possibility of influencing the response time constant is to have a different thermal transmission to the two sensors~ This can for example be achieved in that the first sensor at least partly carries thermal insulation.
; In a preferred embodiment comprising an operating element of which the pressure chamber is formed by a can carrying an in-wardly directed flange at the open end and corrugated tubular bel-lows which have a movable base and are connected to the flange at the opposite end, in order to form the second operating element the invention makes provision for second corrugated tubular bellows of smaller diameter to extend between the flange and the movable base~
This results in a particularly compact construction. The effective pressure area of the first operating element is formed by the entire base and the effective pressure area of the second operating element is formed by the annular surface between the two corrugated tubular bellows.
In this case it is not necessary for the second corrugated tubular bellows to be soldered to the base of the first corrugated tubular bellows. Instead, the second corrugated tubular bellows may ph:h3 .,, . ~ , .
:.. . , .. :. -. .
likewise comprise a movable base and the vapour pressure in the second operating element may be kept lower than in the first operating element under normal conditions. This pressure ---requirement results in the two bases making contact with one another during normal conditions and during sudden cooling. They need only be separated during sudden heating of the room, i.e. a very rare occurrence, with the result that the valve will then for only a short time be regulated in response to the second sensor.
~In a preferred embodiment, the filling of both sensors 10 consist of the same material, and the first sensor is connected to the valve by a thermal conductor bridge having a thermal resistance -such that it normally has a somewhat higher temperature than the second sensor. As a result of this temperature difference of, say, 1C, it is ensured that the vapour pressure in the first operating element during normal conditions will always be somewhat higher than the vapour pressure in the second operating element.
It has proved advantageous for the response time constant of the second sensor to be about 10 to 30% of that of the first sensor. In particular, the response time constant of the first sensor may be about 15 minutes and that of the second sensor about 3 minutes. As a result, it will be about 10 minutes after a sudden temperature drop before; the valve is opened beyond the original position.
The invention will now be described in more detail with reference to the example shown in the drawing, wherein:-Fig. 1 is a longitudinal section of an actuator according to the invention placed on a valve housing, and BM/,- - C,~, ~
- `. . . : ` . . :. : ., : ``
~'` : ~: ' . : :
10734Zl Fig. 2 is a time-displacement graph.
A valve housing 1 having an inlet connection 2 and an outlet connection 3 comprises a pin 4 which is non-positively connected to the closure member which is subjected to an opening spring (not shown) which tends to push the pin 4 outwardly.
Clamped to the valve housing there is a thermostatic actuator in the form of an attachment 5. For this purpose the attachment is provided with a carrier 6 having feet 7 that can be clamped about an annular surface 9 of the valve housing by means of a clamping band 8. Supported by the carrier 6 which is of plastics material there is a can 10 carrying an inwardly directed flange 11 at the open end. Two concentric corrugated tubular bellows 12 and 13 are soldered thereto. me corrugated tubular : .
~ bellows 12 are in one piece with a movable base 14 and the v corrugated tubular bellows 13 are in one piece with a movabl~ base !1 - 15. The base 15 acts on the pin 4 by way of a rod 16. In addition, it supports a desired value spring 17 of which the other end is held on a plate 18 having an external screwthread 19. The latter co-operates with the internal screwthread 20 of a sleeve-like knob 21 which is covered at the front by an apertured plate 22. The can 10 together with the outer corrugated tubular bellows 12 bounds a chamber 23 which also serves as a first operating element Al and, since it contains a liquid 24 that can be vaporized, it also serves as a first sensor Fl. The effective pressure area of this operating element is equal to the diameter of the movable base 14.
Formed between the corrugated tubular bellows 12 and 13 there is a chamber 25 which forms a second operating element A2 and is connected by a capillary tube 26 to a second sensor F2 which ph: - -. . : -: - .
,: . ~ .
: . ::: ; .
,, :- ~ :: : -:.,.. : : :
10734Zl likewise contains a liquid ?7 that can be vaporized. The effective pressure area of this second operating element is, as long as the bases 14 and 15 lie on one another, equal to the annular area that remains exposed between the two bases.
`Known actuators do not have the system consisting of the second operating element A2 and the second sensor F2. The position of the closure member is obtained from the position of equilibrium at which the force of the desired value spring 17 is equal to the vapour pressure in the chamber 23 times the area of the base 14.
`~ 10 By turning the sleeve 21, the stress of the spring 17 and thus the desired temperature can be altered. When a known such valve has a position xO in order to maintain a certain temperature in the room and the sensor is suddenly swept by cold air as a result of airing the room thereby leading to a new position xl at which the valve is opened further, one obtains the chain-dotted curve I in Fig. 2 from which it will be evident that at a time tl of for example 10 minu~es after the time to when the window was opened the valve will already have moved more than 50% of the distance to the new position. By reason of this, the connected heater will have been filled with hot water and stored an excessive amount of heat when the window is close~
In the new construction, an additional force acts in the direction of the spring equal to the vapour pressure in the sensor F2 times the annular area of the second operating element A2. The second sensor F2 has a much smaller mass than the first sensor Fl.
Consequently it has a correspondingly lower response time constant.
During a sudden temperature drop, its vapour pressure is rapidly ~/ ~
,, : , , :
. : . : , -:. : : ::,.. . :-: ~ ' :'' - `' ` `
` 10734Zl reduced. This relief results in a closure movement of the valve.
The movement will be reversed only when the first sensor is cooled further. Only at the time tl will the original position x0 of the closure member be reached again. Only thereafter will there be ;~ further opening corresponding to the curve II shown in full lines in Fig. 2. This shows that on airing the room there will be no increase in the opening cross-section of the valve at all up to a time tl i.e. the heater cannot be filled with hot water in an uncontrolled manner. On the contrary, the flow of heating medium is more intensively throttled. Only when the cold spell lasts for a longer period and is obviously not accounted for by airing of the room will the valve be set to the appropriate slow cross-section.
The vaporizable liquids in both sensors consist of the same medium. The carrier 6 forms a thermal bridge between the valve housing 1 and the first sensor Fl. By means of an appropriate construction and choice of material it should have a thermal resistance such that the temperature of the sensor Fl is slightly higher than that of the sensor F2 during normal conditions. A
temperature difference of about 1C is sufficient to keep the vapour pressure in the operating element Al larger than in the operating element A2 with the result that the two bases 14 and 15 lie non-positively on top of one another. This non-positive connection is maintained when the pressure in the operating element A2 drops further during cooling.
To obtain the desired different response time constants it is not only material that considerably larger masses have to be heated for the first sensor Fl than for the second sensor F2 but also the fact that the first sensor is partially surrounded by BM/~ J
' '''' " ' ' ' " ' ' '' " ~ : ' ! ' : .
' ' ' ' , ,' " ~
thermal insulation that is here formed by parts of the sleeve 21.
It is only through the hole 28 in the aperture plate 22 and through slots 29 in the sleeve that conYectiOn flow can pass unhindered to the surface of the can 10.
In one example, the base 14 had an area of 10 cm2 ana the base 15 an area of 6cm2. The position x0 corresponds to a pressure of 2.1 kg/cm2 in the operating element Al and a pressure of 2.0 kg/cm2 in the operating element A2 as well as a load of 13 ~' kg by the desired value spring. Upon a temperature drop, the pressure in the second sensor is reduced to 1.8 kg/cm2 to give rise to further compression of the spring to 13.8 kg and thus *urther -closure of the valve. Only after the pressure in the first operat-ing element Al has also dropped to 1.9 kg/cm2 will the final con-dition xl be obtained at which the spring was able to expand to 11.8 kg.
In this case the first sensor had a response time constant of 15 minutes and the second sensor a response time constant of 3 minutes. This results in a time lag (tl - to) of about 10 minutes.
, ~ ph~
-
.
Many such actuators are known. They are often formed as an attachment for placing on a valve housing. A known contruction comprises an operating element of which the pressure chamber is - formed by a can carrying an inwardly directed flange at the open - 10 end and corrugated tubular bellows which have a movable base and are connected to the flange at the opposite end. The can may consist of thermally conductive metal and serve directly at the room temperature sensor.
Valves for heating medium that are regulated by means of i such thermostatic autuators permit so much heating medium to flow to the heat exchanger that the temperature set in the room is maintained. When a room is aired and the sensor is located in the region of the inflowing cold air, which is particularly the case when the sensor is arranged beneath the window or near the floor, the temperature that is determined is much too low and the valve is opened completely. The result of this is that the heat exchanger is constantly replenished with hot water and the room is overheated after the window is closed.
The invention is based on the problem of providing a thermostatic actuator of the aforementioned kind which prevents the excessive supply of heat during temporary airing of a room.
BM/_~c~
. . .
:: ~ - ~ . .: . - -: -: ,- :: : . .
:
10734Zl This problem is solved according to the invention by a second room temperature sensor which likewise has a liquid-vapour filling but a lower response time constant than the first sensor, and by a second operating element of which the effective pressure area is less than that of the first operating element and is subjected to the vapour pressure in the second sensor in the -~
direction of the spring.
: .
With this construction, when there is a sudden temperature change the second sensor responds more'quickly than the first sensor. However, since the effect of the second sensor is opposite to that of the first sensor, a sudden temperature drop of the kind arising during airing will first cause the valve closing member to move in the closing direction. Contrary to hitherto, the heating means are therefore throttled. Only after a certain time wil-l the influence of the first sensor predominate; the direction of move-mént of the closure member is reversed; finally, it passes beyond the original position and opens the valve further. The response of the actuator to the sudden temperature drop therefore takes place with a considerable time delay. This delay can be such that during a conventional airing period, which rarely exceeds 10 minutes during the heating period, no unduly large quantities ~f heating medium can reach the heat exchanger. For slow temperature variations of the kind arising during the rest of the control period, the action of the second sensor has little influence on the control behaviour.
The different response time'constants of the two sensors can be achieved by the most varied expedients. In particular, the first sensor may be associated with a large mass and the' second _ 2 BM/ ; ~
- . ., ~ . ' ,, -- : ~
': , . . .
.. .
sensor with a small mass. This is achieved in a particularly simple manner in that the first sensor forms a unit with the first ` operating element, the unit exhibiting a chamber, and the second sensor is connected to the second operating element by a capillary tube. The effective mass stored by the second sensor is then determined only by the mass of the first sensor whereas the effective mass stored by the first sensor is formed by the total mass of the sensor and operating element as well as any other parts connected thereto.
Another possibility of influencing the response time constant is to have a different thermal transmission to the two sensors~ This can for example be achieved in that the first sensor at least partly carries thermal insulation.
; In a preferred embodiment comprising an operating element of which the pressure chamber is formed by a can carrying an in-wardly directed flange at the open end and corrugated tubular bel-lows which have a movable base and are connected to the flange at the opposite end, in order to form the second operating element the invention makes provision for second corrugated tubular bellows of smaller diameter to extend between the flange and the movable base~
This results in a particularly compact construction. The effective pressure area of the first operating element is formed by the entire base and the effective pressure area of the second operating element is formed by the annular surface between the two corrugated tubular bellows.
In this case it is not necessary for the second corrugated tubular bellows to be soldered to the base of the first corrugated tubular bellows. Instead, the second corrugated tubular bellows may ph:h3 .,, . ~ , .
:.. . , .. :. -. .
likewise comprise a movable base and the vapour pressure in the second operating element may be kept lower than in the first operating element under normal conditions. This pressure ---requirement results in the two bases making contact with one another during normal conditions and during sudden cooling. They need only be separated during sudden heating of the room, i.e. a very rare occurrence, with the result that the valve will then for only a short time be regulated in response to the second sensor.
~In a preferred embodiment, the filling of both sensors 10 consist of the same material, and the first sensor is connected to the valve by a thermal conductor bridge having a thermal resistance -such that it normally has a somewhat higher temperature than the second sensor. As a result of this temperature difference of, say, 1C, it is ensured that the vapour pressure in the first operating element during normal conditions will always be somewhat higher than the vapour pressure in the second operating element.
It has proved advantageous for the response time constant of the second sensor to be about 10 to 30% of that of the first sensor. In particular, the response time constant of the first sensor may be about 15 minutes and that of the second sensor about 3 minutes. As a result, it will be about 10 minutes after a sudden temperature drop before; the valve is opened beyond the original position.
The invention will now be described in more detail with reference to the example shown in the drawing, wherein:-Fig. 1 is a longitudinal section of an actuator according to the invention placed on a valve housing, and BM/,- - C,~, ~
- `. . . : ` . . :. : ., : ``
~'` : ~: ' . : :
10734Zl Fig. 2 is a time-displacement graph.
A valve housing 1 having an inlet connection 2 and an outlet connection 3 comprises a pin 4 which is non-positively connected to the closure member which is subjected to an opening spring (not shown) which tends to push the pin 4 outwardly.
Clamped to the valve housing there is a thermostatic actuator in the form of an attachment 5. For this purpose the attachment is provided with a carrier 6 having feet 7 that can be clamped about an annular surface 9 of the valve housing by means of a clamping band 8. Supported by the carrier 6 which is of plastics material there is a can 10 carrying an inwardly directed flange 11 at the open end. Two concentric corrugated tubular bellows 12 and 13 are soldered thereto. me corrugated tubular : .
~ bellows 12 are in one piece with a movable base 14 and the v corrugated tubular bellows 13 are in one piece with a movabl~ base !1 - 15. The base 15 acts on the pin 4 by way of a rod 16. In addition, it supports a desired value spring 17 of which the other end is held on a plate 18 having an external screwthread 19. The latter co-operates with the internal screwthread 20 of a sleeve-like knob 21 which is covered at the front by an apertured plate 22. The can 10 together with the outer corrugated tubular bellows 12 bounds a chamber 23 which also serves as a first operating element Al and, since it contains a liquid 24 that can be vaporized, it also serves as a first sensor Fl. The effective pressure area of this operating element is equal to the diameter of the movable base 14.
Formed between the corrugated tubular bellows 12 and 13 there is a chamber 25 which forms a second operating element A2 and is connected by a capillary tube 26 to a second sensor F2 which ph: - -. . : -: - .
,: . ~ .
: . ::: ; .
,, :- ~ :: : -:.,.. : : :
10734Zl likewise contains a liquid ?7 that can be vaporized. The effective pressure area of this second operating element is, as long as the bases 14 and 15 lie on one another, equal to the annular area that remains exposed between the two bases.
`Known actuators do not have the system consisting of the second operating element A2 and the second sensor F2. The position of the closure member is obtained from the position of equilibrium at which the force of the desired value spring 17 is equal to the vapour pressure in the chamber 23 times the area of the base 14.
`~ 10 By turning the sleeve 21, the stress of the spring 17 and thus the desired temperature can be altered. When a known such valve has a position xO in order to maintain a certain temperature in the room and the sensor is suddenly swept by cold air as a result of airing the room thereby leading to a new position xl at which the valve is opened further, one obtains the chain-dotted curve I in Fig. 2 from which it will be evident that at a time tl of for example 10 minu~es after the time to when the window was opened the valve will already have moved more than 50% of the distance to the new position. By reason of this, the connected heater will have been filled with hot water and stored an excessive amount of heat when the window is close~
In the new construction, an additional force acts in the direction of the spring equal to the vapour pressure in the sensor F2 times the annular area of the second operating element A2. The second sensor F2 has a much smaller mass than the first sensor Fl.
Consequently it has a correspondingly lower response time constant.
During a sudden temperature drop, its vapour pressure is rapidly ~/ ~
,, : , , :
. : . : , -:. : : ::,.. . :-: ~ ' :'' - `' ` `
` 10734Zl reduced. This relief results in a closure movement of the valve.
The movement will be reversed only when the first sensor is cooled further. Only at the time tl will the original position x0 of the closure member be reached again. Only thereafter will there be ;~ further opening corresponding to the curve II shown in full lines in Fig. 2. This shows that on airing the room there will be no increase in the opening cross-section of the valve at all up to a time tl i.e. the heater cannot be filled with hot water in an uncontrolled manner. On the contrary, the flow of heating medium is more intensively throttled. Only when the cold spell lasts for a longer period and is obviously not accounted for by airing of the room will the valve be set to the appropriate slow cross-section.
The vaporizable liquids in both sensors consist of the same medium. The carrier 6 forms a thermal bridge between the valve housing 1 and the first sensor Fl. By means of an appropriate construction and choice of material it should have a thermal resistance such that the temperature of the sensor Fl is slightly higher than that of the sensor F2 during normal conditions. A
temperature difference of about 1C is sufficient to keep the vapour pressure in the operating element Al larger than in the operating element A2 with the result that the two bases 14 and 15 lie non-positively on top of one another. This non-positive connection is maintained when the pressure in the operating element A2 drops further during cooling.
To obtain the desired different response time constants it is not only material that considerably larger masses have to be heated for the first sensor Fl than for the second sensor F2 but also the fact that the first sensor is partially surrounded by BM/~ J
' '''' " ' ' ' " ' ' '' " ~ : ' ! ' : .
' ' ' ' , ,' " ~
thermal insulation that is here formed by parts of the sleeve 21.
It is only through the hole 28 in the aperture plate 22 and through slots 29 in the sleeve that conYectiOn flow can pass unhindered to the surface of the can 10.
In one example, the base 14 had an area of 10 cm2 ana the base 15 an area of 6cm2. The position x0 corresponds to a pressure of 2.1 kg/cm2 in the operating element Al and a pressure of 2.0 kg/cm2 in the operating element A2 as well as a load of 13 ~' kg by the desired value spring. Upon a temperature drop, the pressure in the second sensor is reduced to 1.8 kg/cm2 to give rise to further compression of the spring to 13.8 kg and thus *urther -closure of the valve. Only after the pressure in the first operat-ing element Al has also dropped to 1.9 kg/cm2 will the final con-dition xl be obtained at which the spring was able to expand to 11.8 kg.
In this case the first sensor had a response time constant of 15 minutes and the second sensor a response time constant of 3 minutes. This results in a time lag (tl - to) of about 10 minutes.
, ~ ph~
-
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A thermostatic actuator for a valve for a heating medium, comprising a first room temperature sensor having a liquid-vapour filling, and a first operating element having an effective pressure area which becomes displaced under the action of the vapour pressure against the force of a spring, characterized by a second room temperature sensor which likewise has a liquid-vapour filling but a lower response time constant than said first sensor and by a second operation element of which the effective pressure area is less than that of said first operating element and is subjected to the vapour pressure in the second sensor in the direction of the force of said spring.
2. An actuator according to claim 1, wherein said first sensor forms a unit with said first operating element, the unit defining a chamber therein, and said second sensor is connected to said second operation element by a capillary tube.
3. An actuator according to claim 2, wherein said first sensor at least partly carries thermal insulation.
4. An actuator according to claim 3, where-in said first operating element is formed by a can carrying an inwardly directed flange at the open end, and first corrugated tubular bellows having a movable base and adjoining the flange at the opposite end, and said second operating element is formed by second corrugated tubular bellows of smaller diameter than the first bellows, extending between said flange and the movable base of said first bellows.
5. An actuator according to claim 4, wherein the second corrugated tubular bellows likewise includes a movable base and the vapour pressure in the second operating element is kept lower than in the first operating element under normal conditions.
6. An actuator according to claim 5, wherein said first and second sensors are filled with the same material and said first sensor is connected to the valve by a thermal conductor bridge having a thermal resistance such that it normally has a somewhat higher temperature than said second sensor.
7. An actuator according to claim 6, wherein the response time constant of said second sensor is about 10 to 30% of that of said first sensor.
8. An actuator according to claim 7, wherein the response time constant of said first sensor is about 15 minutes and that of said second sensor is about 3 minutes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762613991 DE2613991C2 (en) | 1976-04-01 | 1976-04-01 | Thermostatic actuator for a heating medium valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1073421A true CA1073421A (en) | 1980-03-11 |
Family
ID=5974136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA275,173A Expired CA1073421A (en) | 1976-04-01 | 1977-03-30 | Thermostatic actuator for a valve for heating medium |
Country Status (7)
| Country | Link |
|---|---|
| CA (1) | CA1073421A (en) |
| CH (1) | CH601750A5 (en) |
| DE (1) | DE2613991C2 (en) |
| DK (1) | DK131477A (en) |
| FR (1) | FR2346645A1 (en) |
| GB (1) | GB1570752A (en) |
| SE (1) | SE410906B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3022001C2 (en) * | 1980-06-12 | 1983-03-03 | Ludwig 3560 Biedenkopf Plack | Device on a thermostatic valve |
| NL8300553A (en) * | 1983-02-14 | 1984-09-03 | Dow Chemical Nederland | APPARATUS AND METHOD FOR ACCURATE MEASUREMENT OF TEMPERATURE DIFFERENCES. |
| DE3313999A1 (en) * | 1983-04-18 | 1984-10-25 | Danfoss A/S, Nordborg | THERMAL ACTUATOR, ESPECIALLY FOR VALVES |
| DE3601894A1 (en) * | 1986-01-23 | 1987-07-30 | Anschuetz Regeltechnik Optik | Hydraulic position transmitter |
| DE3832737A1 (en) * | 1988-09-27 | 1990-03-29 | Ego Italiana | TEMPERATURE CONTROLLED VALVE |
| DE4133942A1 (en) * | 1991-10-14 | 1993-04-15 | Heimeier Gmbh Metall Theodor | Heating system thermostat valve - has equalisation unit external to valve housing, providing temperature regulation independent of base temperature |
| DE19534186A1 (en) * | 1995-09-15 | 1997-03-27 | Danfoss As | Radiator thermostat element |
| DE19635339A1 (en) * | 1996-08-31 | 1998-03-05 | Deutsch Zentr Luft & Raumfahrt | Thermostatic valve |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1600830A1 (en) * | 1967-02-25 | 1970-03-19 | Kosmos Armaturen U Appbau Fran | Thermostatically controlled valve for heat exchanger |
| DE2158950A1 (en) * | 1971-11-27 | 1973-05-30 | Albert Geb | THERMOSTATIC RADIATOR VALVE |
| DE2428511A1 (en) * | 1974-06-12 | 1976-01-22 | Centra Buerkle Kg Albert | Thermostatically controlled valve - is fitted with heat sensitive element which is used to close valve against spirring force |
-
1976
- 1976-04-01 DE DE19762613991 patent/DE2613991C2/en not_active Expired
-
1977
- 1977-03-22 CH CH354377A patent/CH601750A5/xx not_active IP Right Cessation
- 1977-03-25 DK DK131477A patent/DK131477A/en not_active Application Discontinuation
- 1977-03-25 GB GB12630/77A patent/GB1570752A/en not_active Expired
- 1977-03-29 FR FR7709387A patent/FR2346645A1/en active Granted
- 1977-03-30 CA CA275,173A patent/CA1073421A/en not_active Expired
- 1977-03-31 SE SE7703762A patent/SE410906B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE7703762L (en) | 1977-10-02 |
| FR2346645A1 (en) | 1977-10-28 |
| DE2613991B1 (en) | 1977-03-10 |
| DK131477A (en) | 1977-10-02 |
| SE410906B (en) | 1979-11-12 |
| DE2613991C2 (en) | 1977-10-27 |
| GB1570752A (en) | 1980-07-09 |
| FR2346645B1 (en) | 1983-03-18 |
| CH601750A5 (en) | 1978-07-14 |
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